diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ad8d009..6289664 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.2
       with:
           fetch-depth: 0
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 90d426f..0e459ff 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v6.0.2
     - name: Set up Python 3.9
       uses: actions/setup-python@v4
       with:
diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index 9411df9..6ba9bc5 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v6
+      uses: actions/checkout@v6.0.2
       with:
           fetch-depth: 0
     - name: Set up Python ${{ matrix.python-version }}