diff --git a/.github/workflows/CI.yaml b/.github/workflows/CI.yaml
index a662ba6a..4005afa5 100644
--- a/.github/workflows/CI.yaml
+++ b/.github/workflows/CI.yaml
@@ -172,7 +172,12 @@ jobs:
         run: python -m pip install -e ".[test]"
 
       - name: Test with pytest
-        run: python -m pytest tests
+        run: python -m pytest --cov=anesthetic tests
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   latest-dependencies:
     runs-on: ubuntu-latest