diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index ad5f8dd..f908e6e 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -22,7 +22,7 @@ jobs:
       - name: "Copy to index.html"
         run: cp ${{ env.deploy-dir }}/theindex.html ${{ env.deploy-dir }}/index.html
       - name: Deploy documents
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ${{ env.deploy-dir }}