diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index b31c3c77..b97a2759 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -58,8 +58,8 @@ jobs:
           gcovr --sonarqube coverage.xml -r ..
 
       - name: Upload Codecov.io
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # v3.1.4
         with:
           directory:        .
+          flags:            unittests
           fail_ci_if_error: true
-