diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8f419d9..4d7271d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Prepare
         uses: subosito/flutter-action@v2
         with:
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index b9831ae..56ba07e 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -13,7 +13,7 @@ jobs:
       contents: read
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: dart-lang/setup-dart@v1
       - name: Install Flutter SDK
         uses: britannio/action-install-flutter@v1