diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bbc3bd0..9ae5bf6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,7 +6,7 @@ jobs:
     name: Build
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install
         run: npm ci
       - name: Build
diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index a0bde71..b4e73da 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -6,7 +6,7 @@ jobs:
     name: Format Check
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install
         run: npm ci
       - name: Check Format
diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 9d8f0cc..cd9279d 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -6,7 +6,7 @@ jobs:
     name: Unit Test
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install
         run: npm ci
       - name: Run Tests