diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index c0ab265..90923f3 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -80,7 +80,7 @@ jobs:
           cd tests
           pytest --cov=kliff --cov-report=xml
 
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10' && github.repository == 'openkim/kliff'
         with:
           token: ${{ secrets.CODECOV_TOKEN }}