diff --git a/.github/workflows/python-app.yaml b/.github/workflows/python-app.yaml
index f255475..130b512 100644
--- a/.github/workflows/python-app.yaml
+++ b/.github/workflows/python-app.yaml
@@ -45,7 +45,7 @@ jobs:
         pytest --cov=pycoxmunk pycoxmunk/Tests/ --cov-report=xml
 
     - name: Upload unittest coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         flags: unittests
         file: ./coverage.xml