diff --git a/.github/workflows/dsa.yml b/.github/workflows/dsa.yml
index 646dbbc5..1da1e5fa 100644
--- a/.github/workflows/dsa.yml
+++ b/.github/workflows/dsa.yml
@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         toolchain:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -42,7 +42,7 @@ jobs:
           - macos-latest
           - windows-latest
         toolchain:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/.github/workflows/ecdsa.yml b/.github/workflows/ecdsa.yml
index 99fc4272..7c94110a 100644
--- a/.github/workflows/ecdsa.yml
+++ b/.github/workflows/ecdsa.yml
@@ -26,7 +26,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         rust:
-          - 1.73.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -42,7 +42,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.73.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/lms.yml b/.github/workflows/lms.yml
index 9e25581a..ed64db8b 100644
--- a/.github/workflows/lms.yml
+++ b/.github/workflows/lms.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.73.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/rfc6979.yml b/.github/workflows/rfc6979.yml
index 82be5fc0..5c76cce1 100644
--- a/.github/workflows/rfc6979.yml
+++ b/.github/workflows/rfc6979.yml
@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.72.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/slh-dsa.yml b/.github/workflows/slh-dsa.yml
index e83e536e..57734cf6 100644
--- a/.github/workflows/slh-dsa.yml
+++ b/.github/workflows/slh-dsa.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.75.0 # MSRV
+          - 1.81.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index 19eaf41d..ac56e05b 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -29,6 +29,6 @@ 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-features -- -D warnings
diff --git a/dsa/Cargo.toml b/dsa/Cargo.toml
index 00df2734..19f50d38 100644
--- a/dsa/Cargo.toml
+++ b/dsa/Cargo.toml
@@ -13,7 +13,7 @@ homepage = "https://github.com/RustCrypto/signatures/tree/master/dsa"
 repository = "https://github.com/RustCrypto/signatures"
 categories = ["cryptography", "no-std"]
 keywords = ["crypto", "nist", "signature"]
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 digest = "=0.11.0-pre.9"
diff --git a/ecdsa/Cargo.toml b/ecdsa/Cargo.toml
index 730a9c5b..4162793f 100644
--- a/ecdsa/Cargo.toml
+++ b/ecdsa/Cargo.toml
@@ -14,7 +14,7 @@ readme = "README.md"
 categories = ["cryptography", "no-std"]
 keywords = ["crypto", "ecc", "nist", "secp256k1", "signature"]
 edition = "2021"
-rust-version = "1.73"
+rust-version = "1.81"
 
 [dependencies]
 elliptic-curve = { version = "0.14.0-rc.1", default-features = false, features = ["digest", "sec1"] }
diff --git a/lms/Cargo.toml b/lms/Cargo.toml
index 2432bfe1..573bc3e5 100644
--- a/lms/Cargo.toml
+++ b/lms/Cargo.toml
@@ -7,7 +7,7 @@ license = "Apache-2.0 OR MIT"
 homepage = "https://github.com/RustCrypto/signatures/tree/master/lms"
 repository = "https://github.com/RustCrypto/signatures"
 readme = "README.md"
-rust-version = "1.73"
+rust-version = "1.81"
 categories = ["cryptography"]
 keywords = ["crypto", "signature"]
 
diff --git a/rfc6979/Cargo.toml b/rfc6979/Cargo.toml
index 7d3c7e10..77f19fed 100644
--- a/rfc6979/Cargo.toml
+++ b/rfc6979/Cargo.toml
@@ -13,7 +13,7 @@ readme = "README.md"
 categories = ["cryptography", "no-std"]
 keywords = ["dsa", "ecdsa", "signature"]
 edition = "2021"
-rust-version = "1.72"
+rust-version = "1.81"
 
 [dependencies]
 hmac = { version = "=0.13.0-pre.4", default-features = false, features = ["reset"] }
diff --git a/slh-dsa/Cargo.toml b/slh-dsa/Cargo.toml
index deddafb2..d044fdf3 100644
--- a/slh-dsa/Cargo.toml
+++ b/slh-dsa/Cargo.toml
@@ -6,7 +6,7 @@ FIPS-205 standard
 """
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.81"
 license = "Apache-2.0 OR MIT"
 homepage = "https://github.com/RustCrypto/signatures/tree/master/slh-dsa"
 repository = "https://github.com/RustCrypto/signatures"