diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index d7b9a13..efefb7a 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -35,7 +35,7 @@ jobs:
           sh generate-doc.sh
 
       - name: deploy
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           # base dir is checkout: /path/to/psweep