diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0eef918..d22d0b2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,15 +12,15 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@b725eda525362e7cf34af9a7243cac1e3f01a7ec # stable
         with:
           components: rustfmt, clippy
 
       - name: Cache cargo
-        uses: actions/cache@v5
+        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
         with:
           path: |
             ~/.cargo/registry
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ffa053d..73716fa 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@b725eda525362e7cf34af9a7243cac1e3f01a7ec # stable
 
       - name: Cache cargo
-        uses: actions/cache@v5
+        uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
         with:
           path: |
             ~/.cargo/registry
@@ -54,7 +54,7 @@ jobs:
         run: cargo publish
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@v3
+        uses: softprops/action-gh-release@efb35369e0ad2afab669f228072c1b0d510eae64 # v3.0.3
         with:
           generate_release_notes: true
           prerelease: ${{ contains(github.ref_name, '-alpha') || contains(github.ref_name, '-beta') || contains(github.ref_name, '-rc') }}