diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 4c066965..8a8dbbb0 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -20,7 +20,7 @@ jobs:
     if: ${{ github.repository == 'ruby/racc' && !startsWith(github.event_name, 'pull') }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v6.0.0
       - name: Setup Ruby
         uses: ruby/setup-ruby@d5126b9b3579e429dd52e51e68624dda2e05be25 # v1.267.0
         with:
diff --git a/.github/workflows/push_gem.yml b/.github/workflows/push_gem.yml
index 6ff99fae..8ec350e6 100644
--- a/.github/workflows/push_gem.yml
+++ b/.github/workflows/push_gem.yml
@@ -31,7 +31,7 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      - uses: actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5 # v5.0.1
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@d5126b9b3579e429dd52e51e68624dda2e05be25 # v1.267.0
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 55c2afe4..324370ba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -36,7 +36,7 @@ jobs:
           - {os: macos-latest, ruby: jruby }
           - {os: macos-latest, ruby: jruby-head }
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.0
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{matrix.ruby}}