diff --git a/.github/workflows/api-docs.yml b/.github/workflows/api-docs.yml
index daaf6313..576bef61 100644
--- a/.github/workflows/api-docs.yml
+++ b/.github/workflows/api-docs.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
       with:
         persist-credentials: false
 
@@ -39,7 +39,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
         with:
           ssh-key: ${{ secrets.SSH_DEPLOY_KEY }}
           repository: cmusphinx/cmusphinx.github.io
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d1cade0b..521e595c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
 
       - name: Build wheels
         uses: pypa/cibuildwheel@8d2b08b68458a16aeb24b64e68a09ab1c8e82084 # was: pypa/cibuildwheel@v3.4.1
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
 
     - name: Build SDist
       run: pipx run build --sdist
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4b6a553c..a12fdcfc 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
       - name: Install
         run: |
           sudo apt-get install sox ninja-build
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
       - name: Install
         run: |
           sudo apt-get install sox ninja-build
@@ -51,7 +51,7 @@ jobs:
           - macos-latest
           - windows-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
       - name: Setup python for test ${{ matrix.py }}
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # was: actions/setup-python@v6
         with:
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # was: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # was: actions/checkout@v6.0.3
       - name: Install
         run: |
           sudo apt-get install sox