diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 3fcb1e9..76c757c 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -80,7 +80,7 @@ jobs:
         run: cp -rf graphs/ docs/
 
       - name: Deploy /docs to GitHub Pages.
-        uses: peaceiris/actions-gh-pages@373f7f263a76c20808c831209c920827a82a2847 # v3
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: gh-pages