diff --git a/.github/workflows/buildtest.yml b/.github/workflows/buildtest.yml
index 56a9e94..e346e72 100644
--- a/.github/workflows/buildtest.yml
+++ b/.github/workflows/buildtest.yml
@@ -84,7 +84,7 @@ jobs:
         run: |
           cd doc; make html
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: "doc/build/html/"