diff --git a/README.md b/README.md
index db61607f..a5ba656b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # soroban-examples <!-- omit in toc -->
 
-Example contracts for Soroban, preview release 10.
+Example contracts for Soroban.
 
 Follow along with [The Documentation](https://soroban.stellar.org/docs/).
 
diff --git a/account/Cargo.lock b/account/Cargo.lock
index f107d3cb..e6b85451 100644
--- a/account/Cargo.lock
+++ b/account/Cargo.lock
@@ -165,9 +165,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -240,6 +240,34 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest 0.10.7",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -390,20 +418,44 @@ dependencies = [
  "signature 1.6.4",
 ]
 
+[[package]]
+name = "ed25519"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
+dependencies = [
+ "pkcs8",
+ "signature 2.1.0",
+]
+
 [[package]]
 name = "ed25519-dalek"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
 dependencies = [
- "curve25519-dalek",
- "ed25519",
- "rand",
+ "curve25519-dalek 3.2.0",
+ "ed25519 1.5.3",
+ "rand 0.7.3",
  "serde",
  "sha2 0.9.9",
  "zeroize",
 ]
 
+[[package]]
+name = "ed25519-dalek"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+dependencies = [
+ "curve25519-dalek 4.0.0",
+ "ed25519 2.2.2",
+ "rand_core 0.6.4",
+ "serde",
+ "sha2 0.10.7",
+ "zeroize",
+]
+
 [[package]]
 name = "either"
 version = "1.8.1"
@@ -445,6 +497,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -574,12 +632,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -685,13 +737,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -750,6 +802,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -792,11 +850,22 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom 0.1.16",
  "libc",
- "rand_chacha",
+ "rand_chacha 0.2.2",
  "rand_core 0.5.1",
  "rand_hc",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.2.2"
@@ -807,6 +876,16 @@ dependencies = [
  "rand_core 0.5.1",
 ]
 
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -1010,22 +1089,21 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 name = "soroban-account-contract"
 version = "0.0.0"
 dependencies = [
- "ed25519-dalek",
- "rand",
+ "ed25519-dalek 1.0.1",
+ "rand 0.7.3",
  "soroban-sdk",
 ]
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1036,9 +1114,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1046,23 +1124,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
- "ed25519-dalek",
+ "ed25519-dalek 2.0.0",
  "getrandom 0.2.10",
- "hex",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
- "rand",
- "rand_chacha",
- "sha2 0.9.9",
+ "rand 0.8.5",
+ "rand_chacha 0.3.1",
+ "sha2 0.10.7",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1073,9 +1148,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1084,14 +1159,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1102,9 +1176,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1114,15 +1188,15 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
  "ctor",
- "ed25519-dalek",
- "rand",
+ "ed25519-dalek 2.0.0",
+ "rand 0.8.5",
  "soroban-env-guest",
  "soroban-env-host",
  "soroban-ledger-snapshot",
@@ -1132,9 +1206,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1142,7 +1216,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2 0.10.7",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1152,9 +1226,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1164,14 +1238,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2 0.10.7",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1180,11 +1254,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1226,9 +1299,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1426,9 +1499,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
diff --git a/account/Cargo.toml b/account/Cargo.toml
index 6a16c860..15bf5fc6 100644
--- a/account/Cargo.toml
+++ b/account/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 ed25519-dalek = { version = "1.0.1" }
 rand = { version = "0.7.3" }
 
diff --git a/alloc/Cargo.lock b/alloc/Cargo.lock
index 66bcf35e..5e3fe01e 100644
--- a/alloc/Cargo.lock
+++ b/alloc/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1015,15 +957,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1034,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1044,23 +985,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1071,9 +1009,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1082,14 +1020,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/alloc/Cargo.toml b/alloc/Cargo.toml
index 4f4060f2..fd8c7d5b 100644
--- a/alloc/Cargo.toml
+++ b/alloc/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2", features = ["alloc"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["alloc"] }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils", "alloc"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils", "alloc"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/atomic_multiswap/Cargo.lock b/atomic_multiswap/Cargo.lock
index c582da47..2712da99 100644
--- a/atomic_multiswap/Cargo.lock
+++ b/atomic_multiswap/Cargo.lock
@@ -104,15 +104,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -128,12 +119,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -183,9 +168,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -220,7 +205,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -247,17 +232,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -358,22 +358,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -392,33 +383,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -436,12 +428,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -459,10 +451,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -480,17 +478,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -500,7 +487,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -517,7 +504,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -542,7 +529,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -592,12 +579,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -632,8 +613,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -703,13 +684,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -746,12 +727,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -768,6 +743,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -804,34 +785,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -840,16 +810,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -968,19 +929,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -989,7 +937,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -998,24 +946,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1034,15 +976,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1053,9 +994,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1063,23 +1004,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1090,9 +1028,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1101,14 +1039,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1119,9 +1056,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1131,9 +1068,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1149,9 +1086,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1159,7 +1096,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1169,9 +1106,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1181,14 +1118,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1197,11 +1134,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1243,9 +1179,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1369,12 +1305,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1443,9 +1373,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1573,17 +1503,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/atomic_multiswap/Cargo.toml b/atomic_multiswap/Cargo.toml
index 7bafc13a..88f51417 100644
--- a/atomic_multiswap/Cargo.toml
+++ b/atomic_multiswap/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 assert_unordered = "0.3.5"
 
 [profile.release]
diff --git a/atomic_multiswap/src/test.rs b/atomic_multiswap/src/test.rs
index d54b6489..da4922e5 100644
--- a/atomic_multiswap/src/test.rs
+++ b/atomic_multiswap/src/test.rs
@@ -8,8 +8,8 @@ use soroban_sdk::{
     testutils::{Address as _, AuthorizedFunction, AuthorizedInvocation},
     token, Address, Env, IntoVal,
 };
-use token::AdminClient as TokenAdminClient;
 use token::Client as TokenClient;
+use token::StellarAssetClient as TokenAdminClient;
 
 fn create_token_contract<'a>(e: &Env, admin: &Address) -> (TokenClient<'a>, TokenAdminClient<'a>) {
     let contract_address = e.register_stellar_asset_contract(admin.clone());
@@ -26,7 +26,7 @@ fn create_atomic_multiswap_contract(e: &Env) -> AtomicMultiSwapContractClient {
 #[test]
 fn test_atomic_multi_swap() {
     let env = Env::default();
-    env.mock_all_auths();
+    env.mock_all_auths_allowing_non_root_auth();
 
     let swaps_a = [
         SwapSpec {
@@ -236,7 +236,7 @@ fn test_atomic_multi_swap() {
 #[test]
 fn test_multi_swap_with_duplicate_account() {
     let env = Env::default();
-    env.mock_all_auths();
+    env.mock_all_auths_allowing_non_root_auth();
 
     let address_a = Address::random(&env);
     let address_b = Address::random(&env);
diff --git a/atomic_swap/Cargo.lock b/atomic_swap/Cargo.lock
index 5023ac06..6e256c93 100644
--- a/atomic_swap/Cargo.lock
+++ b/atomic_swap/Cargo.lock
@@ -92,15 +92,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -116,12 +107,6 @@ version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -131,7 +116,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -161,9 +146,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -198,7 +183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -220,22 +205,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
 dependencies = [
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -257,7 +257,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -268,7 +268,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -289,16 +289,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -307,7 +298,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -326,33 +317,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -370,12 +362,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -393,10 +385,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -414,17 +412,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -434,7 +421,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -451,7 +438,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -476,7 +463,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -525,12 +512,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -565,8 +546,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -624,13 +605,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -667,12 +648,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -689,6 +664,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -702,7 +683,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -725,34 +706,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -761,16 +731,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -841,7 +802,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -880,20 +841,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -904,7 +852,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -913,24 +861,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -948,15 +890,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -967,9 +908,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -977,23 +918,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1004,9 +942,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1014,15 +952,14 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.22",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1033,21 +970,21 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1063,9 +1000,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1073,19 +1010,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1095,27 +1032,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1157,9 +1093,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1181,17 +1117,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.22"
@@ -1220,7 +1145,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -1268,12 +1193,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1301,7 +1220,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1323,7 +1242,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1342,9 +1261,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1463,17 +1382,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.22",
-]
diff --git a/atomic_swap/Cargo.toml b/atomic_swap/Cargo.toml
index 1589f5aa..6bcce0c6 100644
--- a/atomic_swap/Cargo.toml
+++ b/atomic_swap/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/atomic_swap/src/test.rs b/atomic_swap/src/test.rs
index 3515f1df..4f384533 100644
--- a/atomic_swap/src/test.rs
+++ b/atomic_swap/src/test.rs
@@ -7,8 +7,8 @@ use soroban_sdk::{
     testutils::{Address as _, AuthorizedFunction, AuthorizedInvocation},
     token, Address, Env, IntoVal,
 };
-use token::AdminClient as TokenAdminClient;
 use token::Client as TokenClient;
+use token::StellarAssetClient as TokenAdminClient;
 
 fn create_token_contract<'a>(e: &Env, admin: &Address) -> (TokenClient<'a>, TokenAdminClient<'a>) {
     let contract_address = e.register_stellar_asset_contract(admin.clone());
diff --git a/auth/Cargo.lock b/auth/Cargo.lock
index c54ba6a5..3550a3f8 100644
--- a/auth/Cargo.lock
+++ b/auth/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1015,15 +957,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1034,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1044,23 +985,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1071,9 +1009,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1082,14 +1020,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/auth/Cargo.toml b/auth/Cargo.toml
index 922d1572..74186a49 100644
--- a/auth/Cargo.toml
+++ b/auth/Cargo.toml
@@ -8,10 +8,10 @@ publish = false
 crate-type = ["cdylib"]
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/cross_contract/contract_a/Cargo.lock b/cross_contract/contract_a/Cargo.lock
index 524197e4..728dd562 100644
--- a/cross_contract/contract_a/Cargo.lock
+++ b/cross_contract/contract_a/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1015,15 +957,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1034,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1044,23 +985,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1071,9 +1009,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1082,14 +1020,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/cross_contract/contract_a/Cargo.toml b/cross_contract/contract_a/Cargo.toml
index 7ddfd972..d05310f4 100644
--- a/cross_contract/contract_a/Cargo.toml
+++ b/cross_contract/contract_a/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/cross_contract/contract_b/Cargo.lock b/cross_contract/contract_b/Cargo.lock
index 58bb4f48..133b0240 100644
--- a/cross_contract/contract_b/Cargo.lock
+++ b/cross_contract/contract_b/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1015,15 +957,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1034,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1044,23 +985,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1071,9 +1009,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1082,14 +1020,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/cross_contract/contract_b/Cargo.toml b/cross_contract/contract_b/Cargo.toml
index bbe9c0fb..2d9479ca 100644
--- a/cross_contract/contract_b/Cargo.toml
+++ b/cross_contract/contract_b/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/custom_types/Cargo.lock b/custom_types/Cargo.lock
index d212c59c..3a7696ff 100644
--- a/custom_types/Cargo.lock
+++ b/custom_types/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1015,15 +957,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1034,9 +975,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1044,23 +985,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1071,9 +1009,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1082,14 +1020,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/custom_types/Cargo.toml b/custom_types/Cargo.toml
index d7f79824..ba4ad7f1 100644
--- a/custom_types/Cargo.toml
+++ b/custom_types/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/deep_contract_auth/Cargo.lock b/deep_contract_auth/Cargo.lock
index 1df7ae8e..d6bb68a0 100644
--- a/deep_contract_auth/Cargo.lock
+++ b/deep_contract_auth/Cargo.lock
@@ -92,15 +92,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -116,12 +107,6 @@ version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -131,7 +116,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -161,9 +146,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -198,7 +183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -220,22 +205,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
 dependencies = [
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -257,7 +257,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -268,7 +268,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -289,16 +289,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -307,7 +298,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -326,33 +317,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -370,12 +362,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -393,10 +385,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -414,17 +412,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -434,7 +421,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -451,7 +438,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -476,7 +463,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -525,12 +512,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -565,8 +546,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -624,13 +605,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -667,12 +648,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -689,6 +664,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -702,7 +683,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -725,34 +706,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -761,16 +731,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -841,7 +802,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -880,20 +841,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -904,7 +852,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -913,24 +861,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -948,15 +890,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -967,9 +908,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -977,23 +918,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1004,9 +942,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1014,15 +952,14 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.22",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1033,21 +970,21 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1063,9 +1000,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1073,19 +1010,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1095,27 +1032,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1157,9 +1093,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1181,17 +1117,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.22"
@@ -1220,7 +1145,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -1268,12 +1193,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1301,7 +1220,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1323,7 +1242,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1342,9 +1261,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1463,17 +1382,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.22",
-]
diff --git a/deep_contract_auth/Cargo.toml b/deep_contract_auth/Cargo.toml
index dc275371..cf666e6f 100644
--- a/deep_contract_auth/Cargo.toml
+++ b/deep_contract_auth/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/deployer/contract/Cargo.lock b/deployer/contract/Cargo.lock
index b58be3c5..3501be0a 100644
--- a/deployer/contract/Cargo.lock
+++ b/deployer/contract/Cargo.lock
@@ -92,15 +92,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -116,12 +107,6 @@ version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -131,7 +116,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -161,9 +146,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -198,7 +183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -220,22 +205,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
 dependencies = [
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -257,7 +257,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -268,7 +268,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -289,16 +289,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -307,7 +298,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -326,33 +317,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -370,12 +362,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -393,10 +385,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -414,17 +412,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -434,7 +421,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -451,7 +438,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -476,7 +463,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -525,12 +512,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -565,8 +546,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -624,13 +605,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -667,12 +648,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -689,6 +664,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -702,7 +683,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -725,34 +706,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -761,16 +731,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -841,7 +802,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -880,20 +841,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -904,7 +852,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -913,24 +861,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -948,15 +890,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -967,9 +908,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -977,23 +918,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1004,9 +942,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1014,15 +952,14 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.22",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1033,21 +970,21 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1063,9 +1000,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1073,19 +1010,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1095,27 +1032,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1157,9 +1093,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1181,17 +1117,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.22"
@@ -1220,7 +1145,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -1268,12 +1193,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1301,7 +1220,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1323,7 +1242,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1342,9 +1261,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1463,17 +1382,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.22",
-]
diff --git a/deployer/contract/Cargo.toml b/deployer/contract/Cargo.toml
index da4b47ec..85b54846 100644
--- a/deployer/contract/Cargo.toml
+++ b/deployer/contract/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/deployer/deployer/Cargo.lock b/deployer/deployer/Cargo.lock
index 1df7ae8e..d6bb68a0 100644
--- a/deployer/deployer/Cargo.lock
+++ b/deployer/deployer/Cargo.lock
@@ -92,15 +92,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -116,12 +107,6 @@ version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -131,7 +116,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -161,9 +146,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -198,7 +183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -220,22 +205,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
 dependencies = [
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -257,7 +257,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -268,7 +268,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -289,16 +289,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -307,7 +298,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -326,33 +317,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -370,12 +362,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -393,10 +385,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -414,17 +412,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -434,7 +421,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -451,7 +438,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -476,7 +463,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -525,12 +512,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -565,8 +546,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -624,13 +605,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -667,12 +648,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -689,6 +664,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -702,7 +683,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -725,34 +706,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -761,16 +731,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -841,7 +802,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -880,20 +841,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -904,7 +852,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -913,24 +861,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -948,15 +890,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -967,9 +908,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -977,23 +918,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1004,9 +942,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1014,15 +952,14 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.22",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1033,21 +970,21 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1063,9 +1000,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1073,19 +1010,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1095,27 +1032,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.22",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1157,9 +1093,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1181,17 +1117,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.22"
@@ -1220,7 +1145,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
 ]
 
 [[package]]
@@ -1268,12 +1193,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1301,7 +1220,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1323,7 +1242,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1342,9 +1261,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1463,17 +1382,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.22",
-]
diff --git a/deployer/deployer/Cargo.toml b/deployer/deployer/Cargo.toml
index dc275371..cf666e6f 100644
--- a/deployer/deployer/Cargo.toml
+++ b/deployer/deployer/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/errors/Cargo.lock b/errors/Cargo.lock
index 73b20bc5..8ad7bbcb 100644
--- a/errors/Cargo.lock
+++ b/errors/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,7 +1013,6 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
@@ -1087,9 +1024,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/errors/Cargo.toml b/errors/Cargo.toml
index 8f3124ce..857abedf 100644
--- a/errors/Cargo.toml
+++ b/errors/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/events/Cargo.lock b/events/Cargo.lock
index 374e26d8..11142273 100644
--- a/events/Cargo.lock
+++ b/events/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,7 +1013,6 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
@@ -1087,9 +1024,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/events/Cargo.toml b/events/Cargo.toml
index ea70d0d3..a58a9e55 100644
--- a/events/Cargo.toml
+++ b/events/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/fuzzing/Cargo.lock b/fuzzing/Cargo.lock
index 0cc7d39b..44224cc6 100644
--- a/fuzzing/Cargo.lock
+++ b/fuzzing/Cargo.lock
@@ -113,15 +113,6 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -152,7 +143,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -182,9 +173,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -219,7 +210,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -236,27 +227,42 @@ dependencies = [
 
 [[package]]
 name = "ctor"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
+checksum = "1f34ba9a9bcb8645379e9de8cb3ecfcf4d1c85ba66d90deb3259206fa5aa193b"
 dependencies = [
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -278,7 +284,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -289,7 +295,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -310,16 +316,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -328,7 +325,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -347,33 +344,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand 0.7.3",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -391,12 +389,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -444,10 +442,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -465,17 +469,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -485,7 +478,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -502,7 +495,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -533,7 +526,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -591,12 +584,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "io-lifetimes"
 version = "1.0.11"
@@ -642,8 +629,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -713,13 +700,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -757,12 +744,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -779,6 +760,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -792,7 +779,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -815,8 +802,8 @@ dependencies = [
  "byteorder",
  "lazy_static",
  "num-traits",
- "rand 0.8.5",
- "rand_chacha 0.3.1",
+ "rand",
+ "rand_chacha",
  "rand_xorshift",
  "regex-syntax",
  "rusty-fork",
@@ -849,19 +836,6 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "rand"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
-dependencies = [
- "getrandom 0.1.16",
- "libc",
- "rand_chacha 0.2.2",
- "rand_core 0.5.1",
- "rand_hc",
-]
-
 [[package]]
 name = "rand"
 version = "0.8.5"
@@ -869,18 +843,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
  "libc",
- "rand_chacha 0.3.1",
- "rand_core 0.6.4",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
-dependencies = [
- "ppv-lite86",
- "rand_core 0.5.1",
+ "rand_chacha",
+ "rand_core",
 ]
 
 [[package]]
@@ -890,16 +854,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.6.4",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -908,16 +863,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -926,7 +872,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d25bf25ec5ae4a3f1b92f929810509a2f53d7dca2f50b794ff57e3face536c8f"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
 ]
 
 [[package]]
@@ -1038,7 +984,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -1077,20 +1023,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -1101,7 +1034,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -1110,24 +1043,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1138,15 +1065,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1157,9 +1083,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1167,23 +1093,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
- "rand 0.7.3",
- "rand_chacha 0.2.2",
- "sha2 0.9.9",
+ "rand",
+ "rand_chacha",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1194,9 +1117,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1204,8 +1127,7 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.18",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
@@ -1220,9 +1142,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1233,27 +1155,27 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
  "ctor",
  "ed25519-dalek",
- "rand 0.7.3",
+ "rand",
  "soroban-env-guest",
  "soroban-env-host",
  "soroban-ledger-snapshot",
@@ -1263,9 +1185,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1273,19 +1195,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1295,27 +1217,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.18",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1357,9 +1278,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1381,17 +1302,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.18"
@@ -1434,7 +1344,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -1497,12 +1407,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1530,7 +1434,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1552,7 +1456,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1571,9 +1475,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1701,17 +1605,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.18",
-]
diff --git a/fuzzing/Cargo.toml b/fuzzing/Cargo.toml
index 012399b0..3dfb86f1 100644
--- a/fuzzing/Cargo.toml
+++ b/fuzzing/Cargo.toml
@@ -14,10 +14,10 @@ doctest = false
 testutils = []
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 arbitrary = { version = "1.1.3", features = ["derive"] }
 proptest  = "1.2.0"
 proptest-arbitrary-interop = "0.1.0"
diff --git a/fuzzing/fuzz/Cargo.lock b/fuzzing/fuzz/Cargo.lock
index 699b04ea..97438828 100644
--- a/fuzzing/fuzz/Cargo.lock
+++ b/fuzzing/fuzz/Cargo.lock
@@ -92,15 +92,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -116,12 +107,6 @@ version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -131,7 +116,7 @@ dependencies = [
  "num-bigint",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -164,9 +149,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -201,7 +186,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -223,22 +208,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1586fa608b1dab41f667475b4a41faec5ba680aee428bfa5de4ea520fdc6e901"
 dependencies = [
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.1"
@@ -260,7 +260,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -271,7 +271,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -292,16 +292,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
-]
-
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
+ "syn",
 ]
 
 [[package]]
@@ -310,7 +301,7 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -329,33 +320,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -373,12 +365,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -396,10 +388,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -417,17 +415,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -437,7 +424,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -454,7 +441,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -479,7 +466,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -528,12 +515,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -577,8 +558,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -647,13 +628,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -690,12 +671,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -712,6 +687,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -725,7 +706,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9825a04601d60621feed79c4e6b56d65db77cdca55cef43b46b0de1096d1c282"
 dependencies = [
  "proc-macro2",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -748,34 +729,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -784,16 +754,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -864,7 +825,7 @@ checksum = "d9735b638ccc51c28bf6914d90a2e9725b377144fc612c49a611fddd1b631d68"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -903,20 +864,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
-]
-
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
+ "syn",
 ]
 
 [[package]]
@@ -927,7 +875,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -936,24 +884,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -964,15 +906,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -983,9 +924,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -993,23 +934,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1020,9 +958,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1030,8 +968,7 @@ dependencies = [
  "serde",
  "serde_json",
  "stellar-xdr",
- "syn 2.0.18",
- "thiserror",
+ "syn",
 ]
 
 [[package]]
@@ -1053,9 +990,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.1"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "442acd98434fb0596186321490cd197448c65b347441633eb92900547ce20c42"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1066,21 +1003,21 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.1"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02425512286864dcec4c25c585908665caed0b0b5ebd3503fde2b517686ff721"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1096,9 +1033,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.1"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adb197cb9b35c262241f117b30a358699a8905af4e0e1ed1489c0bfa91d72b3e"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1106,19 +1043,19 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
  "stellar-xdr",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.1"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cfb69e46a16b96f3ae2afbc81fd91ac427db1e610101f4e51489e9ce789903a2"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1128,27 +1065,26 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.1"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "329260975209066f8b366dccd52f85952e48a5427283b6dbeeb634082c7537d5"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
- "syn 2.0.18",
+ "syn",
  "thiserror",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1190,9 +1126,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1214,17 +1150,6 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.18"
@@ -1253,7 +1178,7 @@ checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
 ]
 
 [[package]]
@@ -1301,12 +1226,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1334,7 +1253,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -1356,7 +1275,7 @@ checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.18",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -1375,9 +1294,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1496,17 +1415,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.18",
-]
diff --git a/fuzzing/fuzz/Cargo.toml b/fuzzing/fuzz/Cargo.toml
index f297bd52..07755d40 100644
--- a/fuzzing/fuzz/Cargo.toml
+++ b/fuzzing/fuzz/Cargo.toml
@@ -9,8 +9,8 @@ cargo-fuzz = true
 
 [dependencies]
 libfuzzer-sys = "0.4"
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
-soroban-ledger-snapshot = "0.9.2"
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
+soroban-ledger-snapshot = { version = "20.0.0-rc1" }
 
 [dependencies.soroban-fuzzing-contract]
 path = ".."
diff --git a/fuzzing/fuzz/fuzz_targets/fuzz_target_1.rs b/fuzzing/fuzz/fuzz_targets/fuzz_target_1.rs
index 569f4e7f..766e1c71 100644
--- a/fuzzing/fuzz/fuzz_targets/fuzz_target_1.rs
+++ b/fuzzing/fuzz/fuzz_targets/fuzz_target_1.rs
@@ -11,7 +11,7 @@ use soroban_fuzzing_contract::*;
 use soroban_sdk::arbitrary::arbitrary::{self, Arbitrary};
 use soroban_sdk::arbitrary::fuzz_catch_panic;
 use soroban_sdk::testutils::{Address as _, Ledger, LedgerInfo};
-use soroban_sdk::token::AdminClient as TokenAdminClient;
+use soroban_sdk::token::StellarAssetClient as TokenAdminClient;
 use soroban_sdk::token::Client as TokenClient;
 use soroban_sdk::{vec, Address, Env};
 
diff --git a/fuzzing/fuzz/fuzz_targets/fuzz_target_2.rs b/fuzzing/fuzz/fuzz_targets/fuzz_target_2.rs
index 41dd0476..5e61b16c 100644
--- a/fuzzing/fuzz/fuzz_targets/fuzz_target_2.rs
+++ b/fuzzing/fuzz/fuzz_targets/fuzz_target_2.rs
@@ -11,7 +11,7 @@ use soroban_ledger_snapshot::LedgerSnapshot;
 use soroban_sdk::arbitrary::arbitrary::{self, Arbitrary, Unstructured};
 use soroban_sdk::arbitrary::{fuzz_catch_panic, SorobanArbitrary};
 use soroban_sdk::testutils::{Address as _, LedgerInfo};
-use soroban_sdk::token::AdminClient as TokenAdminClient;
+use soroban_sdk::token::StellarAssetClient as TokenAdminClient;
 use soroban_sdk::token::Client as TokenClient;
 use soroban_sdk::xdr::ScAddress;
 use soroban_sdk::{Address, Env, FromVal, Vec};
diff --git a/fuzzing/src/proptest.rs b/fuzzing/src/proptest.rs
index 53ed4060..0df80329 100644
--- a/fuzzing/src/proptest.rs
+++ b/fuzzing/src/proptest.rs
@@ -15,8 +15,8 @@ use proptest_arbitrary_interop::arb;
 use soroban_sdk::arbitrary::arbitrary::{self, Arbitrary};
 use soroban_sdk::arbitrary::fuzz_catch_panic;
 use soroban_sdk::testutils::{Address as _, Ledger, LedgerInfo};
-use soroban_sdk::token::AdminClient as TokenAdminClient;
 use soroban_sdk::token::Client as TokenClient;
+use soroban_sdk::token::StellarAssetClient as TokenAdminClient;
 use soroban_sdk::{vec, Address, Env};
 
 #[derive(Arbitrary, Debug, Clone)]
diff --git a/hello_world/Cargo.lock b/hello_world/Cargo.lock
index cb5492fe..a66808e3 100644
--- a/hello_world/Cargo.lock
+++ b/hello_world/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,7 +1013,6 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
@@ -1087,9 +1024,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/hello_world/Cargo.toml b/hello_world/Cargo.toml
index d1b7af94..4db2278b 100644
--- a/hello_world/Cargo.toml
+++ b/hello_world/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/increment/Cargo.lock b/increment/Cargo.lock
index 23786677..645a2d46 100644
--- a/increment/Cargo.lock
+++ b/increment/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,7 +1013,6 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
@@ -1087,9 +1024,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/increment/Cargo.toml b/increment/Cargo.toml
index 90536fa1..fe274ac1 100644
--- a/increment/Cargo.toml
+++ b/increment/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/increment/src/lib.rs b/increment/src/lib.rs
index 01a842d5..29a04e5c 100644
--- a/increment/src/lib.rs
+++ b/increment/src/lib.rs
@@ -20,11 +20,11 @@ impl IncrementContract {
         // Save the count.
         env.storage().instance().set(&COUNTER, &count);
 
-        // The contract instance will be bumped to have a lifetime of at least 100 ledgers.
+        // The contract instance will be bumped to have a lifetime of at least 100 ledgers if the current expiration lifetime at most 50.
         // If the lifetime is already more than 100 ledgers, this is a no-op. Otherwise,
         // the lifetime is extended to 100 ledgers. This lifetime bump includes the contract
         // instance itself and all entries in storage().instance(), i.e, COUNTER.
-        env.storage().instance().bump(100);
+        env.storage().instance().bump(50, 100);
 
         // Return the count to the caller.
         count
diff --git a/liquidity_pool/Cargo.lock b/liquidity_pool/Cargo.lock
index dd48e957..8a5d0717 100644
--- a/liquidity_pool/Cargo.lock
+++ b/liquidity_pool/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1101,9 +1038,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1113,9 +1050,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1131,9 +1068,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1141,7 +1078,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1151,9 +1088,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1163,14 +1100,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1179,11 +1116,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1225,9 +1161,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1351,12 +1287,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1425,9 +1355,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1555,17 +1485,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/liquidity_pool/Cargo.toml b/liquidity_pool/Cargo.toml
index 1aeb0862..be36c9b4 100644
--- a/liquidity_pool/Cargo.toml
+++ b/liquidity_pool/Cargo.toml
@@ -8,11 +8,11 @@ publish = false
 crate-type = ["cdylib"]
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 num-integer = { version = "0.1.45", default-features = false, features = ["i128"] }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/logging/Cargo.lock b/logging/Cargo.lock
index 284f0d13..12006ddf 100644
--- a/logging/Cargo.lock
+++ b/logging/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1100,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1112,9 +1049,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1130,9 +1067,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1140,7 +1077,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/logging/Cargo.toml b/logging/Cargo.toml
index cf1dcece..5e7390fa 100644
--- a/logging/Cargo.toml
+++ b/logging/Cargo.toml
@@ -14,10 +14,10 @@ doctest = false
 testutils = ["soroban-sdk/testutils"]
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/simple_account/Cargo.lock b/simple_account/Cargo.lock
index 7dc120a0..2115b9cc 100644
--- a/simple_account/Cargo.lock
+++ b/simple_account/Cargo.lock
@@ -165,9 +165,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -240,6 +240,34 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest 0.10.7",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -390,20 +418,44 @@ dependencies = [
  "signature 1.6.4",
 ]
 
+[[package]]
+name = "ed25519"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
+dependencies = [
+ "pkcs8",
+ "signature 2.1.0",
+]
+
 [[package]]
 name = "ed25519-dalek"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
 dependencies = [
- "curve25519-dalek",
- "ed25519",
- "rand",
+ "curve25519-dalek 3.2.0",
+ "ed25519 1.5.3",
+ "rand 0.7.3",
  "serde",
  "sha2 0.9.9",
  "zeroize",
 ]
 
+[[package]]
+name = "ed25519-dalek"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
+dependencies = [
+ "curve25519-dalek 4.0.0",
+ "ed25519 2.2.2",
+ "rand_core 0.6.4",
+ "serde",
+ "sha2 0.10.7",
+ "zeroize",
+]
+
 [[package]]
 name = "either"
 version = "1.8.1"
@@ -445,6 +497,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -574,12 +632,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -685,13 +737,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -750,6 +802,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -792,11 +850,22 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom 0.1.16",
  "libc",
- "rand_chacha",
+ "rand_chacha 0.2.2",
  "rand_core 0.5.1",
  "rand_hc",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.2.2"
@@ -807,6 +876,16 @@ dependencies = [
  "rand_core 0.5.1",
 ]
 
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.5.1"
@@ -1008,15 +1087,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +1105,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +1115,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
- "ed25519-dalek",
+ "ed25519-dalek 2.0.0",
  "getrandom 0.2.10",
- "hex",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
- "rand",
- "rand_chacha",
- "sha2 0.9.9",
+ "rand 0.8.5",
+ "rand_chacha 0.3.1",
+ "sha2 0.10.7",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1139,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1150,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1167,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,15 +1179,15 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
  "ctor",
- "ed25519-dalek",
- "rand",
+ "ed25519-dalek 2.0.0",
+ "rand 0.8.5",
  "soroban-env-guest",
  "soroban-env-host",
  "soroban-ledger-snapshot",
@@ -1123,9 +1197,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1207,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2 0.10.7",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1145,16 +1219,16 @@ dependencies = [
 name = "soroban-simple-account-contract"
 version = "0.0.0"
 dependencies = [
- "ed25519-dalek",
- "rand",
+ "ed25519-dalek 1.0.1",
+ "rand 0.7.3",
  "soroban-sdk",
 ]
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1164,14 +1238,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2 0.10.7",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1180,11 +1254,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1226,9 +1299,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1426,9 +1499,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
diff --git a/simple_account/Cargo.toml b/simple_account/Cargo.toml
index 990cf526..c2be8db9 100644
--- a/simple_account/Cargo.toml
+++ b/simple_account/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 ed25519-dalek = { version = "1.0.1" }
 rand = { version = "0.7.3" }
 
diff --git a/single_offer/Cargo.lock b/single_offer/Cargo.lock
index 119e140d..a49eff42 100644
--- a/single_offer/Cargo.lock
+++ b/single_offer/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1030,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,9 +1042,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1123,9 +1060,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1070,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1150,9 +1087,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1162,14 +1099,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/single_offer/Cargo.toml b/single_offer/Cargo.toml
index 0187b7ee..316fdca4 100644
--- a/single_offer/Cargo.toml
+++ b/single_offer/Cargo.toml
@@ -8,10 +8,10 @@ publish = false
 crate-type = ["cdylib"]
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/single_offer/src/test.rs b/single_offer/src/test.rs
index d21018f1..45a27343 100644
--- a/single_offer/src/test.rs
+++ b/single_offer/src/test.rs
@@ -11,11 +11,11 @@ use soroban_sdk::{
 fn create_token_contract<'a>(
     e: &Env,
     admin: &Address,
-) -> (token::Client<'a>, token::AdminClient<'a>) {
+) -> (token::Client<'a>, token::StellarAssetClient<'a>) {
     let addr = e.register_stellar_asset_contract(admin.clone());
     (
         token::Client::new(e, &addr),
-        token::AdminClient::new(e, &addr),
+        token::StellarAssetClient::new(e, &addr),
     )
 }
 
diff --git a/timelock/Cargo.lock b/timelock/Cargo.lock
index 86e0aaff..d528e297 100644
--- a/timelock/Cargo.lock
+++ b/timelock/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1030,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,9 +1042,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1123,9 +1060,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1070,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1143,9 +1080,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1155,14 +1092,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/timelock/Cargo.toml b/timelock/Cargo.toml
index f5770de6..3d4c7c0b 100644
--- a/timelock/Cargo.toml
+++ b/timelock/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/timelock/src/test.rs b/timelock/src/test.rs
index a5c1c7e8..a79b6daf 100644
--- a/timelock/src/test.rs
+++ b/timelock/src/test.rs
@@ -4,8 +4,8 @@ extern crate std;
 use super::*;
 use soroban_sdk::testutils::{Address as _, AuthorizedFunction, AuthorizedInvocation, Ledger};
 use soroban_sdk::{symbol_short, token, vec, Address, Env, IntoVal};
-use token::AdminClient as TokenAdminClient;
 use token::Client as TokenClient;
+use token::StellarAssetClient as TokenAdminClient;
 
 fn create_token_contract<'a>(e: &Env, admin: &Address) -> (TokenClient<'a>, TokenAdminClient<'a>) {
     let contract_address = e.register_stellar_asset_contract(admin.clone());
diff --git a/token/Cargo.lock b/token/Cargo.lock
index 5241c03a..a6d8ee0e 100644
--- a/token/Cargo.lock
+++ b/token/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1030,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,9 +1042,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1123,9 +1060,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1070,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1143,9 +1080,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1155,14 +1092,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1179,20 +1116,19 @@ dependencies = [
 
 [[package]]
 name = "soroban-token-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38fabcf7f14b0a9b471d1663d3b29e32ca374a86dc8da6fe6536b5d3842def45"
+checksum = "38a51799b9febfb08905200008076724b9c3c07d98b60e6b76062d7f20673582"
 dependencies = [
  "soroban-sdk",
 ]
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1234,9 +1170,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1360,12 +1296,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1434,9 +1364,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1564,17 +1494,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/token/Cargo.toml b/token/Cargo.toml
index 8e918546..323032e5 100644
--- a/token/Cargo.toml
+++ b/token/Cargo.toml
@@ -8,11 +8,11 @@ edition = "2021"
 crate-type = ["cdylib"]
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
-soroban-token-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
+soroban-token-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/token/src/allowance.rs b/token/src/allowance.rs
index 86d21cde..550665ea 100644
--- a/token/src/allowance.rs
+++ b/token/src/allowance.rs
@@ -40,12 +40,11 @@ pub fn write_allowance(
     e.storage().temporary().set(&key.clone(), &allowance);
 
     if amount > 0 {
-        e.storage().temporary().bump(
-            &key,
-            expiration_ledger
-                .checked_sub(e.ledger().sequence())
-                .unwrap(),
-        )
+        let live_for = expiration_ledger
+            .checked_sub(e.ledger().sequence())
+            .unwrap();
+
+        e.storage().temporary().bump(&key, live_for, live_for)
     }
 }
 
diff --git a/token/src/balance.rs b/token/src/balance.rs
index a1a48508..40a73040 100644
--- a/token/src/balance.rs
+++ b/token/src/balance.rs
@@ -1,10 +1,12 @@
-use crate::storage_types::{DataKey, BALANCE_BUMP_AMOUNT};
+use crate::storage_types::{DataKey, BALANCE_BUMP_AMOUNT, BALANCE_LIFETIME_THRESHOLD};
 use soroban_sdk::{Address, Env};
 
 pub fn read_balance(e: &Env, addr: Address) -> i128 {
     let key = DataKey::Balance(addr);
     if let Some(balance) = e.storage().persistent().get::<DataKey, i128>(&key) {
-        e.storage().persistent().bump(&key, BALANCE_BUMP_AMOUNT);
+        e.storage()
+            .persistent()
+            .bump(&key, BALANCE_LIFETIME_THRESHOLD, BALANCE_BUMP_AMOUNT);
         balance
     } else {
         0
@@ -14,7 +16,9 @@ pub fn read_balance(e: &Env, addr: Address) -> i128 {
 fn write_balance(e: &Env, addr: Address, amount: i128) {
     let key = DataKey::Balance(addr);
     e.storage().persistent().set(&key, &amount);
-    e.storage().persistent().bump(&key, BALANCE_BUMP_AMOUNT);
+    e.storage()
+        .persistent()
+        .bump(&key, BALANCE_LIFETIME_THRESHOLD, BALANCE_BUMP_AMOUNT);
 }
 
 pub fn receive_balance(e: &Env, addr: Address, amount: i128) {
diff --git a/token/src/contract.rs b/token/src/contract.rs
index 2073c970..35d2a3e4 100644
--- a/token/src/contract.rs
+++ b/token/src/contract.rs
@@ -3,12 +3,12 @@
 use crate::admin::{has_administrator, read_administrator, write_administrator};
 use crate::allowance::{read_allowance, spend_allowance, write_allowance};
 use crate::balance::{read_balance, receive_balance, spend_balance};
-use crate::event;
 use crate::metadata::{read_decimal, read_name, read_symbol, write_metadata};
-use crate::storage_types::INSTANCE_BUMP_AMOUNT;
+use crate::storage_types::{INSTANCE_BUMP_AMOUNT, INSTANCE_LIFETIME_THRESHOLD};
 use soroban_sdk::token::{self, Interface as _};
 use soroban_sdk::{contract, contractimpl, Address, Env, String};
-use soroban_token_sdk::TokenMetadata;
+use soroban_token_sdk::metadata::TokenMetadata;
+use soroban_token_sdk::TokenUtils;
 
 fn check_nonnegative_amount(amount: i128) {
     if amount < 0 {
@@ -45,27 +45,33 @@ impl Token {
         let admin = read_administrator(&e);
         admin.require_auth();
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         receive_balance(&e, to.clone(), amount);
-        event::mint(&e, admin, to, amount);
+        TokenUtils::new(&e).events().mint(admin, to, amount);
     }
 
     pub fn set_admin(e: Env, new_admin: Address) {
         let admin = read_administrator(&e);
         admin.require_auth();
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         write_administrator(&e, &new_admin);
-        event::set_admin(&e, admin, new_admin);
+        TokenUtils::new(&e).events().set_admin(admin, new_admin);
     }
 }
 
 #[contractimpl]
 impl token::Interface for Token {
     fn allowance(e: Env, from: Address, spender: Address) -> i128 {
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
         read_allowance(&e, from, spender).amount
     }
 
@@ -74,36 +80,42 @@ impl token::Interface for Token {
 
         check_nonnegative_amount(amount);
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         write_allowance(&e, from.clone(), spender.clone(), amount, expiration_ledger);
-        event::approve(&e, from, spender, amount, expiration_ledger);
+        TokenUtils::new(&e)
+            .events()
+            .approve(from, spender, amount, expiration_ledger);
     }
 
     fn balance(e: Env, id: Address) -> i128 {
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
         read_balance(&e, id)
     }
 
     fn spendable_balance(e: Env, id: Address) -> i128 {
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
         read_balance(&e, id)
     }
 
-    fn authorized(_e: Env, _id: Address) -> bool {
-        true
-    }
-
     fn transfer(e: Env, from: Address, to: Address, amount: i128) {
         from.require_auth();
 
         check_nonnegative_amount(amount);
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         spend_balance(&e, from.clone(), amount);
         receive_balance(&e, to.clone(), amount);
-        event::transfer(&e, from, to, amount);
+        TokenUtils::new(&e).events().transfer(from, to, amount);
     }
 
     fn transfer_from(e: Env, spender: Address, from: Address, to: Address, amount: i128) {
@@ -111,12 +123,14 @@ impl token::Interface for Token {
 
         check_nonnegative_amount(amount);
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         spend_allowance(&e, from.clone(), spender, amount);
         spend_balance(&e, from.clone(), amount);
         receive_balance(&e, to.clone(), amount);
-        event::transfer(&e, from, to, amount)
+        TokenUtils::new(&e).events().transfer(from, to, amount)
     }
 
     fn burn(e: Env, from: Address, amount: i128) {
@@ -124,10 +138,12 @@ impl token::Interface for Token {
 
         check_nonnegative_amount(amount);
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         spend_balance(&e, from.clone(), amount);
-        event::burn(&e, from, amount);
+        TokenUtils::new(&e).events().burn(from, amount);
     }
 
     fn burn_from(e: Env, spender: Address, from: Address, amount: i128) {
@@ -135,11 +151,13 @@ impl token::Interface for Token {
 
         check_nonnegative_amount(amount);
 
-        e.storage().instance().bump(INSTANCE_BUMP_AMOUNT);
+        e.storage()
+            .instance()
+            .bump(INSTANCE_LIFETIME_THRESHOLD, INSTANCE_BUMP_AMOUNT);
 
         spend_allowance(&e, from.clone(), spender, amount);
         spend_balance(&e, from.clone(), amount);
-        event::burn(&e, from, amount)
+        TokenUtils::new(&e).events().burn(from, amount)
     }
 
     fn decimals(e: Env) -> u32 {
diff --git a/token/src/event.rs b/token/src/event.rs
deleted file mode 100644
index 14ecd7f3..00000000
--- a/token/src/event.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-use soroban_sdk::{symbol_short, Address, Env, Symbol};
-
-pub(crate) fn approve(e: &Env, from: Address, to: Address, amount: i128, expiration_ledger: u32) {
-    let topics = (Symbol::new(e, "approve"), from, to);
-    e.events().publish(topics, (amount, expiration_ledger));
-}
-
-pub(crate) fn transfer(e: &Env, from: Address, to: Address, amount: i128) {
-    let topics = (symbol_short!("transfer"), from, to);
-    e.events().publish(topics, amount);
-}
-
-pub(crate) fn mint(e: &Env, admin: Address, to: Address, amount: i128) {
-    let topics = (symbol_short!("mint"), admin, to);
-    e.events().publish(topics, amount);
-}
-
-pub(crate) fn set_admin(e: &Env, admin: Address, new_admin: Address) {
-    let topics = (symbol_short!("set_admin"), admin);
-    e.events().publish(topics, new_admin);
-}
-
-pub(crate) fn burn(e: &Env, from: Address, amount: i128) {
-    let topics = (symbol_short!("burn"), from);
-    e.events().publish(topics, amount);
-}
diff --git a/token/src/lib.rs b/token/src/lib.rs
index 0531bb8c..b5f04e4d 100644
--- a/token/src/lib.rs
+++ b/token/src/lib.rs
@@ -4,7 +4,6 @@ mod admin;
 mod allowance;
 mod balance;
 mod contract;
-mod event;
 mod metadata;
 mod storage_types;
 mod test;
diff --git a/token/src/metadata.rs b/token/src/metadata.rs
index f09ac1d1..715feeea 100644
--- a/token/src/metadata.rs
+++ b/token/src/metadata.rs
@@ -1,22 +1,22 @@
 use soroban_sdk::{Env, String};
-use soroban_token_sdk::{TokenMetadata, TokenUtils};
+use soroban_token_sdk::{metadata::TokenMetadata, TokenUtils};
 
 pub fn read_decimal(e: &Env) -> u32 {
     let util = TokenUtils::new(e);
-    util.get_metadata().decimal
+    util.metadata().get_metadata().decimal
 }
 
 pub fn read_name(e: &Env) -> String {
     let util = TokenUtils::new(e);
-    util.get_metadata().name
+    util.metadata().get_metadata().name
 }
 
 pub fn read_symbol(e: &Env) -> String {
     let util = TokenUtils::new(e);
-    util.get_metadata().symbol
+    util.metadata().get_metadata().symbol
 }
 
 pub fn write_metadata(e: &Env, metadata: TokenMetadata) {
     let util = TokenUtils::new(e);
-    util.set_metadata(&metadata);
+    util.metadata().set_metadata(&metadata);
 }
diff --git a/token/src/storage_types.rs b/token/src/storage_types.rs
index 707f44d3..5710c057 100644
--- a/token/src/storage_types.rs
+++ b/token/src/storage_types.rs
@@ -1,7 +1,11 @@
 use soroban_sdk::{contracttype, Address};
 
-pub(crate) const INSTANCE_BUMP_AMOUNT: u32 = 34560; // 2 days
-pub(crate) const BALANCE_BUMP_AMOUNT: u32 = 518400; // 30 days
+pub(crate) const DAY_IN_LEDGERS: u32 = 17280;
+pub(crate) const INSTANCE_BUMP_AMOUNT: u32 = 7 * DAY_IN_LEDGERS;
+pub(crate) const INSTANCE_LIFETIME_THRESHOLD: u32 = INSTANCE_BUMP_AMOUNT - DAY_IN_LEDGERS;
+
+pub(crate) const BALANCE_BUMP_AMOUNT: u32 = 30 * DAY_IN_LEDGERS;
+pub(crate) const BALANCE_LIFETIME_THRESHOLD: u32 = BALANCE_BUMP_AMOUNT - DAY_IN_LEDGERS;
 
 #[derive(Clone)]
 #[contracttype]
diff --git a/upgradeable_contract/new_contract/Cargo.lock b/upgradeable_contract/new_contract/Cargo.lock
index a0e33c6c..f1012e27 100644
--- a/upgradeable_contract/new_contract/Cargo.lock
+++ b/upgradeable_contract/new_contract/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1030,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,9 +1042,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1123,9 +1060,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1070,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1143,9 +1080,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1155,14 +1092,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/upgradeable_contract/new_contract/Cargo.toml b/upgradeable_contract/new_contract/Cargo.toml
index da1efc09..8077e099 100644
--- a/upgradeable_contract/new_contract/Cargo.toml
+++ b/upgradeable_contract/new_contract/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"
diff --git a/upgradeable_contract/old_contract/Cargo.lock b/upgradeable_contract/old_contract/Cargo.lock
index ce90d513..a9ea18a7 100644
--- a/upgradeable_contract/old_contract/Cargo.lock
+++ b/upgradeable_contract/old_contract/Cargo.lock
@@ -86,15 +86,6 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
-[[package]]
-name = "block-buffer"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -110,12 +101,6 @@ version = "3.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b1ce199063694f33ffb7dd4e0ee620741495c32833cde5aa08f02a0bf96f0c8"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "bytes-lit"
 version = "0.0.5"
@@ -165,9 +150,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
 
 [[package]]
 name = "core-foundation-sys"
@@ -202,7 +187,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf4c2f4e1afd912bc40bfd6fed5d9dc1f288e0ba01bfcc835cc5bc3eb13efe15"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
  "zeroize",
 ]
@@ -229,17 +214,32 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "3.2.0"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b9fdf9972b2bd6af2d913799d9ebc165ea4d2e65878e329d9c6b372c4491b61"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
- "byteorder",
- "digest 0.9.0",
- "rand_core 0.5.1",
+ "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
+ "digest",
+ "fiat-crypto",
+ "platforms",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "cxx"
 version = "1.0.94"
@@ -340,22 +340,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "digest"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer 0.10.4",
+ "block-buffer",
  "const-oid",
  "crypto-common",
  "subtle",
@@ -374,33 +365,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
 dependencies = [
  "der",
- "digest 0.10.7",
+ "digest",
  "elliptic-curve",
  "rfc6979",
- "signature 2.1.0",
+ "signature",
  "spki",
 ]
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
- "signature 1.6.4",
+ "pkcs8",
+ "signature",
 ]
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
  "curve25519-dalek",
  "ed25519",
- "rand",
+ "rand_core",
  "serde",
- "sha2 0.9.9",
+ "sha2",
  "zeroize",
 ]
 
@@ -418,12 +410,12 @@ checksum = "968405c8fdc9b3bf4df0a6638858cc0b52462836ab6b1c87377785dd09cf1c0b"
 dependencies = [
  "base16ct",
  "crypto-bigint",
- "digest 0.10.7",
+ "digest",
  "ff",
  "generic-array",
  "group",
  "pkcs8",
- "rand_core 0.6.4",
+ "rand_core",
  "sec1",
  "subtle",
  "zeroize",
@@ -441,10 +433,16 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ded41244b729663b1e574f1b4fb731469f69f79c17667b5d776b16cda0479449"
 dependencies = [
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
+[[package]]
+name = "fiat-crypto"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -462,17 +460,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.1.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
-dependencies = [
- "cfg-if",
- "libc",
- "wasi 0.9.0+wasi-snapshot-preview1",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.2.10"
@@ -482,7 +469,7 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasi",
  "wasm-bindgen",
 ]
 
@@ -499,7 +486,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
 dependencies = [
  "ff",
- "rand_core 0.6.4",
+ "rand_core",
  "subtle",
 ]
 
@@ -524,7 +511,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -574,12 +561,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 
-[[package]]
-name = "intx"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f38a50a899dc47a6d0ed5508e7f601a2e34c3a85303514b5d137f3c10a0c75"
-
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -614,8 +595,8 @@ dependencies = [
  "ecdsa",
  "elliptic-curve",
  "once_cell",
- "sha2 0.10.7",
- "signature 2.1.0",
+ "sha2",
+ "signature",
 ]
 
 [[package]]
@@ -685,13 +666,13 @@ dependencies = [
 
 [[package]]
 name = "num-derive"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "876a53fff98e03a936a674b29568b0e605f06b29372c2489ff4de23f1949743d"
+checksum = "9e6a0fd4f737c707bd9086cc16c925f294943eb62eb71499e9fd4cf71f8b9f4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -728,12 +709,6 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
-[[package]]
-name = "opaque-debug"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
-
 [[package]]
 name = "paste"
 version = "1.0.12"
@@ -750,6 +725,12 @@ dependencies = [
  "spki",
 ]
 
+[[package]]
+name = "platforms"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.17"
@@ -786,34 +767,23 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.3"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
- "getrandom 0.1.16",
  "libc",
  "rand_chacha",
- "rand_core 0.5.1",
- "rand_hc",
+ "rand_core",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.5.1",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom 0.1.16",
+ "rand_core",
 ]
 
 [[package]]
@@ -822,16 +792,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.10",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core 0.5.1",
+ "getrandom",
 ]
 
 [[package]]
@@ -950,19 +911,6 @@ dependencies = [
  "syn 2.0.15",
 ]
 
-[[package]]
-name = "sha2"
-version = "0.9.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d58a1e1bf39749807d89cf2d98ac2dfa0ff1cb3faa38fbb64dd88ac8013d800"
-dependencies = [
- "block-buffer 0.9.0",
- "cfg-if",
- "cpufeatures",
- "digest 0.9.0",
- "opaque-debug",
-]
-
 [[package]]
 name = "sha2"
 version = "0.10.7"
@@ -971,7 +919,7 @@ checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
- "digest 0.10.7",
+ "digest",
 ]
 
 [[package]]
@@ -980,24 +928,18 @@ version = "0.10.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
 dependencies = [
- "digest 0.10.7",
+ "digest",
  "keccak",
 ]
 
-[[package]]
-name = "signature"
-version = "1.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74233d3b3b2f6d4b006dc19dee745e73e2a6bfb6f93607cd3b02bd5b00797d7c"
-
 [[package]]
 name = "signature"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
 dependencies = [
- "digest 0.10.7",
- "rand_core 0.6.4",
+ "digest",
+ "rand_core",
 ]
 
 [[package]]
@@ -1008,15 +950,14 @@ checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
 name = "soroban-env-common"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52e28d297d1172c2a020660728ac24ca3af7118de85ad547d071f96221111dfb"
+checksum = "b65261df4aec251bf503bdb9d08a11a0109ad010d22fb6068c5767bd612a76cc"
 dependencies = [
  "arbitrary",
  "crate-git-revision",
  "ethnum",
  "num-derive",
- "num-integer",
  "num-traits",
  "serde",
  "soroban-env-macros",
@@ -1027,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-guest"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fbccdce4f74778cfe79e6ca8b6df2d094237d0bedf4aa167a73bfdaa7388fed"
+checksum = "5353b943c5ce51df6ba333a734867b301d3b1628dc1aa7d00bd59658059c8193"
 dependencies = [
  "soroban-env-common",
  "static_assertions",
@@ -1037,23 +978,20 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-host"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35eef83232686c48fc8c8bfc560ee2e065bdd18ac31da8cb570e93f3fd78fea0"
+checksum = "9b79d564bb297c48be6250334cb33025abe66b90f981de87543b8abd796b3b52"
 dependencies = [
  "backtrace",
- "curve25519-dalek",
  "ed25519-dalek",
- "getrandom 0.2.10",
- "hex",
+ "getrandom",
  "k256",
- "log",
  "num-derive",
  "num-integer",
  "num-traits",
  "rand",
  "rand_chacha",
- "sha2 0.9.9",
+ "sha2",
  "sha3",
  "soroban-env-common",
  "soroban-native-sdk-macros",
@@ -1064,9 +1002,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-env-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97fcab4ca9be166587dd84939576634f2f7bccf213fe9f6aced9561ab4238be1"
+checksum = "d827dbe18b79ade40d0d7cfca4a117b59ae1e0feb8dbd4a97f5fca479b04043d"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1075,14 +1013,13 @@ dependencies = [
  "serde_json",
  "stellar-xdr",
  "syn 2.0.15",
- "thiserror",
 ]
 
 [[package]]
 name = "soroban-ledger-snapshot"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c379a73e5d14b0b9ba41157161c5362427a2ca75c936d1b737d41bca91ef252f"
+checksum = "15b6817c444562363c619afa0519a8d15157bd8be3a2bf02bf7239245ed263a0"
 dependencies = [
  "serde",
  "serde_json",
@@ -1093,9 +1030,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-native-sdk-macros"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d891b456b0f6897ccbb8b67388ed7ce921fd47d19ff3ae8d8b1edca08339639"
+checksum = "de68658cc0351f3dce994b409af3708fea744d31bbfbfa7335f7481b1be847a2"
 dependencies = [
  "itertools",
  "proc-macro2",
@@ -1105,9 +1042,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1cf449f8c53d905ac41d4c264442f26aa559d4a0ef451569a7739bd4d747595"
+checksum = "1afc6bb5ed7a89a41fd6e38e30c61c736f905312c8721fbb708bf19ce96d85cb"
 dependencies = [
  "arbitrary",
  "bytes-lit",
@@ -1123,9 +1060,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-sdk-macros"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ab0a02c265c41a44311e3e6271e0fccd518bda0c8383c7ff8aee478541d3b"
+checksum = "bc90811bcfe1c0fb24fbb1ab8fdd05c98d677ec124b3ce8ef2c0219cb9b47753"
 dependencies = [
  "crate-git-revision",
  "darling",
@@ -1133,7 +1070,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustc_version",
- "sha2 0.9.9",
+ "sha2",
  "soroban-env-common",
  "soroban-spec",
  "soroban-spec-rust",
@@ -1143,9 +1080,9 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adfd732ef1613e5ec919410fddd842d8cb804effb63c43acbf5ec6d77e6d0633"
+checksum = "94e6202dfc8dfd3abcda4f2946d11806a573671d5948c6b2adc5fa8128feeca6"
 dependencies = [
  "base64 0.13.1",
  "stellar-xdr",
@@ -1155,14 +1092,14 @@ dependencies = [
 
 [[package]]
 name = "soroban-spec-rust"
-version = "0.9.2"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fde0592863f1f34c1eff8bdbe35a6557adb6abadfc57804217fe035bec7421ef"
+checksum = "4f21ab4a805e72ba39b58a441466c4a8882b6d635a654fdbcbbae092465854d5"
 dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "sha2 0.9.9",
+ "sha2",
  "soroban-spec",
  "stellar-xdr",
  "syn 2.0.15",
@@ -1178,11 +1115,10 @@ dependencies = [
 
 [[package]]
 name = "soroban-wasmi"
-version = "0.30.0-soroban"
+version = "0.31.0-soroban1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c193640a103c4fc81163feca877bbea234dc20150015428ecc4e010f025f82bf"
+checksum = "1b6e3e79c1f227ec98ea1e8fbf43d0267b9ca748616c9c8c0162fa2a8ca4d5d2"
 dependencies = [
- "intx",
  "smallvec",
  "spin",
  "wasmi_arena",
@@ -1224,9 +1160,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "0.0.17"
+version = "20.0.0-rc1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae197b4edde8835ab0ba018f1b5cdab0c47d0f28848f3f75d2951a1c9c7cdb48"
+checksum = "e09a3734914a7427dbcd4f06b6dcd2b1cf38e934202f6abe4d73658f718b6113"
 dependencies = [
  "arbitrary",
  "base64 0.13.1",
@@ -1350,12 +1286,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1424,9 +1354,9 @@ checksum = "401c1f35e413fac1846d4843745589d9ec678977ab35a384db8ae7830525d468"
 
 [[package]]
 name = "wasmi_core"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "624e6333e861ef49095d2d678b76ebf30b06bf37effca845be7e5b87c90071b7"
+checksum = "dcf1a7db34bff95b85c261002720c00c3a6168256dcb93041d3fa2054d19856a"
 dependencies = [
  "downcast-rs",
  "libm",
@@ -1554,17 +1484,3 @@ name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
-dependencies = [
- "zeroize_derive",
-]
-
-[[package]]
-name = "zeroize_derive"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.15",
-]
diff --git a/upgradeable_contract/old_contract/Cargo.toml b/upgradeable_contract/old_contract/Cargo.toml
index c471c8be..83ff8af6 100644
--- a/upgradeable_contract/old_contract/Cargo.toml
+++ b/upgradeable_contract/old_contract/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["cdylib"]
 doctest = false
 
 [dependencies]
-soroban-sdk = { version = "0.9.2" }
+soroban-sdk = { version = "20.0.0-rc1" }
 
 [dev_dependencies]
-soroban-sdk = { version = "0.9.2", features = ["testutils"] }
+soroban-sdk = { version = "20.0.0-rc1", features = ["testutils"] }
 
 [profile.release]
 opt-level = "z"