diff --git a/filtermail/.github/workflows/ci.yml b/filtermail/.github/workflows/ci.yml
index ba24cce6..bf3b53f7 100644
--- a/filtermail/.github/workflows/ci.yml
+++ b/filtermail/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     name: Check Formatting
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
       - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
@@ -37,7 +37,7 @@ jobs:
     name: Check Unused Dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
       - uses: bnjbvr/cargo-machete@ac30a525c0a8d163a92d727b3ff079ee3f6ecb08 # v0.9.2
@@ -51,7 +51,7 @@ jobs:
         toolchain: ["stable", "beta"]
     continue-on-error: ${{ matrix.toolchain == 'beta' }}
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
       - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
@@ -67,7 +67,7 @@ jobs:
     name: Run rust tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
       - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master
diff --git a/filtermail/.github/workflows/release.yml b/filtermail/.github/workflows/release.yml
index 364df241..dcc45b8d 100644
--- a/filtermail/.github/workflows/release.yml
+++ b/filtermail/.github/workflows/release.yml
@@ -7,7 +7,7 @@ jobs:
     name: Build binaries.
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
       - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master