diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 473a6cc..db0d62a 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Generate document
         run: gem install -N yard && yard doc
       - name: Publish Documentation on GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./doc