diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 45ea64c..b553b16 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -43,4 +43,7 @@ jobs:
       run: python -m pytest --cov=fgivenx
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v4
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+