diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3ca47183..dd97e3e6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: checkout
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b # pin@v1.321.0
         with:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 26b4796f..ddb07b9b 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: checkout
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b # pin@v1.321.0
         with:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b05655c5..5682b28a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: checkout
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b # pin@v1.321.0
         with:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8629b372..36c7867c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,7 +18,7 @@ jobs:
         ruby_version: ["3.3", "3.4", "4.0"]
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Update .ruby-version with matrix value
         run: echo "${{ matrix.ruby_version }}" >| .ruby-version