diff --git a/.github/workflows/abi-ffi-gate.yml b/.github/workflows/abi-ffi-gate.yml
index f647ba6..4779a01 100644
--- a/.github/workflows/abi-ffi-gate.yml
+++ b/.github/workflows/abi-ffi-gate.yml
@@ -20,7 +20,7 @@ jobs:
     name: ABI ↔ FFI structural conformance
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
       - name: Install Julia 1.11.5
         run: |
           curl -fsSL https://julialang-s3.julialang.org/bin/linux/x64/1.11/julia-1.11.5-linux-x86_64.tar.gz -o /tmp/julia.tar.gz
@@ -35,7 +35,7 @@ jobs:
     name: Zig FFI builds + tests (Zig 0.14.0)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
       - name: Install Zig 0.14.0
         run: |
           curl -fsSL https://ziglang.org/download/0.14.0/zig-linux-x86_64-0.14.0.tar.xz -o /tmp/zig.tar.xz
diff --git a/.github/workflows/governance.yml b/.github/workflows/governance.yml
index 06b0f97..62bbc98 100644
--- a/.github/workflows/governance.yml
+++ b/.github/workflows/governance.yml
@@ -31,4 +31,4 @@ permissions:
 
 jobs:
   governance:
-    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@d7c22711e830e1f383846472f6e9b99debdb201e
\ No newline at end of file
+    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@81dbf2dd854b1444fd6236fa2352474383b2c2b9
\ No newline at end of file
diff --git a/.github/workflows/hypatia-scan.yml b/.github/workflows/hypatia-scan.yml
index f99319d..2e7e939 100644
--- a/.github/workflows/hypatia-scan.yml
+++ b/.github/workflows/hypatia-scan.yml
@@ -25,5 +25,5 @@ permissions:
 
 jobs:
   hypatia:
-    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@d7c22711e830e1f383846472f6e9b99debdb201e
+    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@81dbf2dd854b1444fd6236fa2352474383b2c2b9
     secrets: inherit
\ No newline at end of file
diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index 24d42ad..978c9d9 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -21,7 +21,7 @@ jobs:
     name: cargo check (stable)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy, rustfmt
@@ -42,7 +42,7 @@ jobs:
           - "1.85"
           - "stable"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.rust }}
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index a2bc258..64ac2ac 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -12,7 +12,7 @@ permissions: read-all
 
 jobs:
   analysis:
-    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@d7c22711e830e1f383846472f6e9b99debdb201e
+    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@81dbf2dd854b1444fd6236fa2352474383b2c2b9
     permissions:
       contents: read
       security-events: write