diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index e6ed34bf..1ed50859 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -23,4 +23,9 @@ jobs:
           environment-file: .conda/benchcab-dev.yaml
       - name: Test with pytest
         run: |
-          TMPDIR=${{ runner.temp }} pytest
\ No newline at end of file
+          coverage run -m pytest
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+          files: ./.coverage
\ No newline at end of file
diff --git a/tests/common.py b/tests/common.py
index 01952f49..9e0385ef 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -1,9 +1,9 @@
 """Helper functions for `pytest`."""
 
-import os
+import tempfile
 from pathlib import Path
 
-TMP_DIR = Path(os.environ["TMPDIR"], "benchcab_tests")
+TMP_DIR = Path(tempfile.mkdtemp(prefix="benchcab_tests"))
 
 
 def make_barebones_config() -> dict: