diff --git a/.github/workflows/Tests.yaml b/.github/workflows/Tests.yaml
index 6636ca7..5f2d356 100644
--- a/.github/workflows/Tests.yaml
+++ b/.github/workflows/Tests.yaml
@@ -31,8 +31,7 @@ jobs:
         uses: codecov/codecov-action@v4
         with:
           slug: openzim/devdocs
-          # TODO(#4): Codecov uploads are failing. Fix them and turn this on.
-          fail_ci_if_error: false
+          fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
 
   build_python: