diff --git a/.github/workflows/cmpv2.yml b/.github/workflows/cmpv2.yml
index c8ae46e3f..a8bfa8bc7 100644
--- a/.github/workflows/cmpv2.yml
+++ b/.github/workflows/cmpv2.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/cms.yml b/.github/workflows/cms.yml
index b74407326..c77344685 100644
--- a/.github/workflows/cms.yml
+++ b/.github/workflows/cms.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -57,7 +57,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/crmf.yml b/.github/workflows/crmf.yml
index ec8b492ce..7845dcb50 100644
--- a/.github/workflows/crmf.yml
+++ b/.github/workflows/crmf.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/gss-api.yml b/.github/workflows/gss-api.yml
index 82ae6eb09..0ddf1e830 100644
--- a/.github/workflows/gss-api.yml
+++ b/.github/workflows/gss-api.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/pkcs1.yml b/.github/workflows/pkcs1.yml
index 9a3bed3d0..030cd0b95 100644
--- a/.github/workflows/pkcs1.yml
+++ b/.github/workflows/pkcs1.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/pkcs12.yml b/.github/workflows/pkcs12.yml
index 282ffdeca..ea3499655 100644
--- a/.github/workflows/pkcs12.yml
+++ b/.github/workflows/pkcs12.yml
@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/pkcs5.yml b/.github/workflows/pkcs5.yml
index cdba00ade..8ec02177d 100644
--- a/.github/workflows/pkcs5.yml
+++ b/.github/workflows/pkcs5.yml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -51,7 +51,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/pkcs8.yml b/.github/workflows/pkcs8.yml
index a8d8d85d4..3e0d27a20 100644
--- a/.github/workflows/pkcs8.yml
+++ b/.github/workflows/pkcs8.yml
@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -55,7 +55,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/sec1.yml b/.github/workflows/sec1.yml
index c143980a4..99539d5ae 100644
--- a/.github/workflows/sec1.yml
+++ b/.github/workflows/sec1.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/spki.yml b/.github/workflows/spki.yml
index 9e46cc121..551bcc5b3 100644
--- a/.github/workflows/spki.yml
+++ b/.github/workflows/spki.yml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -52,7 +52,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index d9abfc4c0..bc93fe0ab 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.75.0
+          toolchain: 1.81.0
           components: clippy
       - run: cargo clippy --all --all-features --tests
 
diff --git a/.github/workflows/x509-cert.yml b/.github/workflows/x509-cert.yml
index 031a02d8a..339b09f54 100644
--- a/.github/workflows/x509-cert.yml
+++ b/.github/workflows/x509-cert.yml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/x509-ocsp.yml b/.github/workflows/x509-ocsp.yml
index 19c33d7c8..2878dfa1b 100644
--- a/.github/workflows/x509-ocsp.yml
+++ b/.github/workflows/x509-ocsp.yml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -51,7 +51,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/x509-tsp.yml b/.github/workflows/x509-tsp.yml
index 6692d5f3f..ac8ead53f 100644
--- a/.github/workflows/x509-tsp.yml
+++ b/.github/workflows/x509-tsp.yml
@@ -29,7 +29,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -54,7 +54,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/Cargo.lock b/Cargo.lock
index 37f441df1..b4792c8a5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -828,9 +828,9 @@ dependencies = [
 
 [[package]]
 name = "hybrid-array"
-version = "0.2.0-rc.9"
+version = "0.2.0-rc.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d306b679262030ad8813a82d4915fc04efff97776e4db7f8eb5137039d56400"
+checksum = "bae36f8710514b3e7aab028021733330de6e455e0352e19c6dd4513eecb7aa9a"
 dependencies = [
  "typenum",
  "zeroize",
diff --git a/cmpv2/Cargo.toml b/cmpv2/Cargo.toml
index b01b46e79..9445fded3 100644
--- a/cmpv2/Cargo.toml
+++ b/cmpv2/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 crmf = "=0.3.0-pre"
diff --git a/cms/Cargo.toml b/cms/Cargo.toml
index eed22cb25..da44ae7e6 100644
--- a/cms/Cargo.toml
+++ b/cms/Cargo.toml
@@ -12,7 +12,7 @@ categories = ["cryptography", "encoding", "no-std", "parser-implementations"]
 keywords = ["crypto", "pkcs7", "signing"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["alloc", "derive", "oid", "pem"] }
diff --git a/crmf/Cargo.toml b/crmf/Cargo.toml
index af96b18c1..3ad1e04e7 100644
--- a/crmf/Cargo.toml
+++ b/crmf/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 cms = "=0.3.0-pre"
diff --git a/der/src/asn1/integer/int.rs b/der/src/asn1/integer/int.rs
index 1142d576d..91f40567e 100644
--- a/der/src/asn1/integer/int.rs
+++ b/der/src/asn1/integer/int.rs
@@ -30,6 +30,8 @@ macro_rules! impl_encoding_traits {
 
                     let bytes = reader.read_into(&mut buf[..max_length])?;
 
+                    // We actually want the conversion to overflow here
+                    #[allow(clippy::cast_possible_wrap)]
                     let result = if is_highest_bit_set(bytes) {
                         <$uint>::from_be_bytes(decode_to_array(bytes)?) as $int
                     } else {
@@ -48,6 +50,8 @@ macro_rules! impl_encoding_traits {
             impl EncodeValue for $int {
                 fn value_len(&self) -> Result<Length> {
                     if *self < 0 {
+                        // We actually want the conversion to overflow here
+                        #[allow(clippy::cast_sign_loss)]
                         negative_encoded_len(&(*self as $uint).to_be_bytes())
                     } else {
                         uint::encoded_len(&self.to_be_bytes())
@@ -56,6 +60,8 @@ macro_rules! impl_encoding_traits {
 
                 fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
                     if *self < 0 {
+                        // We actually want the conversion to overflow here
+                        #[allow(clippy::cast_sign_loss)]
                         encode_bytes(writer, &(*self as $uint).to_be_bytes())
                     } else {
                         uint::encode_bytes(writer, &self.to_be_bytes())
diff --git a/gss-api/Cargo.toml b/gss-api/Cargo.toml
index 5a343f8d5..60f04a5a4 100644
--- a/gss-api/Cargo.toml
+++ b/gss-api/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "authentication", "encoding", "no-std", "parser-im
 keywords = ["crypto", "gssapi", "kerberos", "krb5"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["oid", "alloc"] }
diff --git a/pkcs1/Cargo.toml b/pkcs1/Cargo.toml
index 43b1f6ebe..eb60e48d9 100644
--- a/pkcs1/Cargo.toml
+++ b/pkcs1/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std", "parser-i
 keywords = ["crypto", "key", "pem", "pkcs", "rsa"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["oid"] }
diff --git a/pkcs12/Cargo.toml b/pkcs12/Cargo.toml
index 3821193bc..28c12df56 100644
--- a/pkcs12/Cargo.toml
+++ b/pkcs12/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "encoding", "no-std", "parser-implementations"]
 keywords = ["crypto", "key", "pkcs", "private"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["alloc", "derive", "oid", "pem"] }
diff --git a/pkcs5/Cargo.toml b/pkcs5/Cargo.toml
index d6c009fda..98bfca76c 100644
--- a/pkcs5/Cargo.toml
+++ b/pkcs5/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto", "key", "pkcs", "password"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["oid"] }
diff --git a/pkcs8/Cargo.toml b/pkcs8/Cargo.toml
index 77fc1f2a9..56cb3d629 100644
--- a/pkcs8/Cargo.toml
+++ b/pkcs8/Cargo.toml
@@ -14,7 +14,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std", "parser-i
 keywords = ["crypto", "key", "pkcs", "private"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["oid"] }
diff --git a/sec1/Cargo.toml b/sec1/Cargo.toml
index 2d5e81b70..b14c071e5 100644
--- a/sec1/Cargo.toml
+++ b/sec1/Cargo.toml
@@ -14,12 +14,12 @@ categories = ["cryptography", "data-structures", "encoding", "no-std", "parser-i
 keywords = ["crypto", "key", "elliptic-curve", "secg"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 base16ct = { version = "0.2", optional = true, default-features = false }
 der = { version = "0.8.0-rc.0", optional = true, features = ["oid"] }
-hybrid-array = { version = "0.2.0-rc.9", optional = true, default-features = false }
+hybrid-array = { version = "0.2.0-rc.10", optional = true, default-features = false }
 pkcs8 = { version = "0.11.0-rc.1", optional = true, default-features = false }
 serdect = { version = "0.3.0-rc.0", optional = true, default-features = false, features = ["alloc"] }
 subtle = { version = "2", optional = true, default-features = false }
diff --git a/spki/Cargo.toml b/spki/Cargo.toml
index 77e2703d8..69bc2e1b0 100644
--- a/spki/Cargo.toml
+++ b/spki/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto", "x509"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["oid"] }
diff --git a/tls_codec/derive/tests/decode_bytes.rs b/tls_codec/derive/tests/decode_bytes.rs
index c08ce3be8..2c42f0638 100644
--- a/tls_codec/derive/tests/decode_bytes.rs
+++ b/tls_codec/derive/tests/decode_bytes.rs
@@ -240,9 +240,9 @@ fn enum_with_custom_serialized_field() {
 
 #[test]
 fn that_skip_attribute_on_struct_works() {
-    fn test<T: DeserializeBytes>(test: T, expected: T)
+    fn test<T>(test: T, expected: T)
     where
-        T: std::fmt::Debug + PartialEq + SerializeBytes + Size,
+        T: DeserializeBytes + std::fmt::Debug + PartialEq + SerializeBytes + Size,
     {
         let serialized = test.tls_serialize().unwrap();
         let (deserialized, rest) = T::tls_deserialize_bytes(&serialized).unwrap();
diff --git a/x509-cert/Cargo.toml b/x509-cert/Cargo.toml
index 19366942f..805000ea1 100644
--- a/x509-cert/Cargo.toml
+++ b/x509-cert/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 const-oid = { version = "0.10.0-rc.0", features = ["db"] }
diff --git a/x509-cert/src/builder.rs b/x509-cert/src/builder.rs
index d86946257..71f2b97a6 100644
--- a/x509-cert/src/builder.rs
+++ b/x509-cert/src/builder.rs
@@ -461,12 +461,12 @@ pub trait AsyncBuilder: Sized {
         S::VerifyingKey: EncodePublicKey;
 
     /// Run the object through the signer and build it.
-    async fn build_async<S, Signature: 'static>(mut self, signer: &S) -> Result<Self::Output>
+    async fn build_async<S, Signature>(mut self, signer: &S) -> Result<Self::Output>
     where
         S: AsyncSigner<Signature>,
         S: Keypair + DynSignatureAlgorithmIdentifier,
         S::VerifyingKey: EncodePublicKey,
-        Signature: SignatureBitStringEncoding,
+        Signature: SignatureBitStringEncoding + 'static,
     {
         let blob = self.finalize(signer)?;
 
@@ -476,7 +476,7 @@ pub trait AsyncBuilder: Sized {
     }
 
     /// Run the object through the signer and build it.
-    async fn build_with_rng_async<S, Signature: 'static>(
+    async fn build_with_rng_async<S, Signature>(
         mut self,
         signer: &S,
         rng: &mut impl CryptoRngCore,
@@ -485,7 +485,7 @@ pub trait AsyncBuilder: Sized {
         S: AsyncRandomizedSigner<Signature>,
         S: Keypair + DynSignatureAlgorithmIdentifier,
         S::VerifyingKey: EncodePublicKey,
-        Signature: SignatureBitStringEncoding,
+        Signature: SignatureBitStringEncoding + 'static,
     {
         let blob = self.finalize(signer)?;
 
diff --git a/x509-cert/src/ext/pkix/sct.rs b/x509-cert/src/ext/pkix/sct.rs
index f03b71ff5..f62cc9864 100644
--- a/x509-cert/src/ext/pkix/sct.rs
+++ b/x509-cert/src/ext/pkix/sct.rs
@@ -3,8 +3,6 @@
 //!
 //! [Certificate Transparency RFC 6962]: https://datatracker.ietf.org/doc/html/rfc6962
 
-#![cfg(feature = "sct")]
-
 use alloc::{format, vec::Vec};
 use const_oid::{db::rfc6962::CT_PRECERT_SCTS, AssociatedOid, ObjectIdentifier};
 use der::asn1::OctetString;
diff --git a/x509-cert/tests/name.rs b/x509-cert/tests/name.rs
index 8a455370d..7daec5a30 100644
--- a/x509-cert/tests/name.rs
+++ b/x509-cert/tests/name.rs
@@ -321,7 +321,7 @@ fn rdns_serde() {
             "1.3.6.1.4.1.1466.0=#04024869",
             &[&[AttributeTypeAndValue {
                 oid: ObjectIdentifier::new("1.3.6.1.4.1.1466.0").unwrap(),
-                value: Any::from(OctetStringRef::new(&[b'H', b'i']).unwrap()),
+                value: Any::from(OctetStringRef::new(b"Hi").unwrap()),
             }]],
         ),
     ];
diff --git a/x509-ocsp/Cargo.toml b/x509-ocsp/Cargo.toml
index ffa4ab262..55cf221ae 100644
--- a/x509-ocsp/Cargo.toml
+++ b/x509-ocsp/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["cryptography", "data-structures", "encoding", "no-std"]
 keywords = ["crypto", "x509"]
 readme = "README.md"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 const-oid = { version = "0.10.0-rc.0", default-features = false, features = ["db"] }
diff --git a/x509-tsp/Cargo.toml b/x509-tsp/Cargo.toml
index e57615fcd..a84557d0c 100644
--- a/x509-tsp/Cargo.toml
+++ b/x509-tsp/Cargo.toml
@@ -12,7 +12,7 @@ repository = "https://github.com/RustCrypto/formats"
 categories = ["cryptography", "encoding", "no-std", "parser-implementations"]
 keywords = ["crypto", "tsp", "timestamp"]
 readme = "README.md"
-rust-version = "1.75"
+rust-version = "1.81"
 
 [dependencies]
 der = { version = "0.8.0-rc.0", features = ["alloc", "derive", "oid", "pem"] }