diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index f74d549..6f44295 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -24,7 +24,7 @@ jobs:
         git config --global core.autocrlf false
         git config --global core.eol lf
         git config --global advice.detachedHead 0
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.0
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/.github/workflows/push_gem.yml b/.github/workflows/push_gem.yml
index 1155df7..5d68e6d 100644
--- a/.github/workflows/push_gem.yml
+++ b/.github/workflows/push_gem.yml
@@ -27,7 +27,7 @@ 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@ab177d40ee5483edb974554986f56b33477e21d0 # v1.265.0
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3efb4d1..76fb04f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -22,7 +22,7 @@ jobs:
         - { os: macos-13, ruby: '2.5' }
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.0
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: