Pin GitHub action versions
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 0748cf0..20f67ea 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -26,6 +26,6 @@
     runs-on: ubuntu-latest
     steps:
       - name: 'Checkout Repository'
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - name: 'Dependency Review'
         uses: actions/dependency-review-action@v4