diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index a949a16..238119d 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -11,7 +11,7 @@ jobs:
     steps:
 
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: pysetup
         uses: actions/setup-python@v2