diff --git a/.github/workflows/mk_docs.yml b/.github/workflows/mk_docs.yml
index 05f1dbb..bb6b4ba 100644
--- a/.github/workflows/mk_docs.yml
+++ b/.github/workflows/mk_docs.yml
@@ -30,7 +30,7 @@ jobs:
          python mk_docs.py 2>&1
 
     - name: Deploy
-      uses: peaceiris/actions-gh-pages@v3
+      uses: peaceiris/actions-gh-pages@v4
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: ./_site