diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 3d7a938d0..3d0e628bd 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -63,7 +63,7 @@ jobs:
         working-directory: ${{ github.workspace }}
 
       - name: Deploy to GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }} # GitHub token for authentication
           publish_branch: gh-pages # Target branch for GitHub Pages deployment