diff --git a/Cargo.lock b/Cargo.lock
index a3d1141..cfcfec0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -62,7 +62,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdffe87e1d521a10f9696f833fe502293ea446d7f256c06128293a4119bdf4cb"
 dependencies = [
  "quote",
- "syn",
+ "syn 1.0.99",
 ]
 
 [[package]]
@@ -94,9 +94,9 @@ name = "fhir"
 version = "0.0.6"
 dependencies = [
  "chrono",
- "prost",
+ "prost 0.11.2",
  "prost-build",
- "prost-types",
+ "prost-types 0.12.0",
  "prost-wkt",
  "prost-wkt-build",
  "prost-wkt-types",
@@ -118,7 +118,7 @@ checksum = "eb19fe8de3ea0920d282f7b77dd4227aea6b8b999b42cdf0ca41b2472b14443a"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.99",
 ]
 
 [[package]]
@@ -258,14 +258,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c142c0e46b57171fe0c528bee8c5b7569e80f0c17e377cd0e30ea57dbc11bb51"
 dependencies = [
  "proc-macro2",
- "syn",
+ "syn 1.0.99",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.43"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a2ca2c61bc9f3d74d2886294ab7b9853abd9c1ad903a3ac7815c58989bb7bab"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
@@ -277,7 +277,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a0841812012b2d4a6145fae9a6af1534873c32aa67fff26bd09f8fa42c83f95a"
 dependencies = [
  "bytes",
- "prost-derive",
+ "prost-derive 0.11.0",
+]
+
+[[package]]
+name = "prost"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa8473a65b88506c106c28ae905ca4a2b83a2993640467a41bb3080627ddfd2c"
+dependencies = [
+ "bytes",
+ "prost-derive 0.12.0",
 ]
 
 [[package]]
@@ -294,10 +304,10 @@ dependencies = [
  "multimap",
  "petgraph",
  "prettyplease",
- "prost",
- "prost-types",
+ "prost 0.11.2",
+ "prost-types 0.11.2",
  "regex",
- "syn",
+ "syn 1.0.99",
  "tempfile",
  "which",
 ]
@@ -312,7 +322,20 @@ dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.99",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56075c27b20ae524d00f247b8a4dc333e5784f889fe63099f8e626bc8d73486c"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -322,7 +345,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "747761bc3dc48f9a34553bf65605cf6cb6288ba219f3450b4275dbd81539551a"
 dependencies = [
  "bytes",
- "prost",
+ "prost 0.11.2",
+]
+
+[[package]]
+name = "prost-types"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cebe0a918c97f86c217b0f76fd754e966f8b9f41595095cf7d74cb4e59d730f6"
+dependencies = [
+ "prost 0.12.0",
 ]
 
 [[package]]
@@ -334,7 +366,7 @@ dependencies = [
  "chrono",
  "inventory",
  "mopa",
- "prost",
+ "prost 0.11.2",
  "serde",
  "serde_derive",
  "serde_json",
@@ -348,9 +380,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "386920d4406fd7c65a165ec56e155f10be9b8e46074dbf872a5adf2b941ffe8f"
 dependencies = [
  "heck",
- "prost",
+ "prost 0.11.2",
  "prost-build",
- "prost-types",
+ "prost-types 0.11.2",
  "quote",
 ]
 
@@ -361,9 +393,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "80f4a140ce5843eeb9c234883f2acec37dcf41f1a418fbb7bd8ad0cacc70d4d0"
 dependencies = [
  "chrono",
- "prost",
+ "prost 0.11.2",
  "prost-build",
- "prost-types",
+ "prost-types 0.11.2",
  "prost-wkt",
  "prost-wkt-build",
  "regex",
@@ -374,9 +406,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.21"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
 dependencies = [
  "proc-macro2",
 ]
@@ -439,7 +471,7 @@ checksum = "34b5b8d809babe02f538c2cfec6f2c1ed10804c0e5a6a041a049a4f5588ccc2e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.99",
 ]
 
 [[package]]
@@ -464,6 +496,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn"
+version = "2.0.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.3.0"
@@ -510,7 +553,7 @@ checksum = "fd4d8ff674190866d3437d2f725355d49e99e3b1a513bf7ee43dcfe7effc36f4"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.99",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 6eae72d..cc9a755 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ license-file = "LICENSE"
 
 [dependencies]
 prost = { version = "0.11", features = ["prost-derive"] }
-prost-types = "0.11"
+prost-types = "0.12"
 prost-wkt = "0.3.4"
 prost-wkt-types = "0.3.3"
 serde = { version = "1.0", features = ["derive"] }