diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f8a3160..bdb1bc9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -74,4 +74,4 @@ jobs:
       - uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          flags: selenium
+          flags: selenium-${{ matrix.os }}
diff --git a/pyproject.toml b/pyproject.toml
index 5add2e4..84176fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,12 +65,19 @@ write_to = "s3file/_version.py"
 
 [tool.pytest.ini_options]
 minversion = "6.0"
-addopts = "--cov=s3file --tb=short -rxs"
+addopts = "--cov --cov-report=xml --cov-report=term --tb=short -rxs"
 testpaths = [
   "tests",
 ]
 DJANGO_SETTINGS_MODULE = "tests.testapp.settings"
 
+[tool.coverage.run]
+source = ["s3file"]
+
+[tool.coverage.report]
+show_missing = true
+skip_covered = true
+
 [tool.ruff]
 src = ["s3file", "tests"]
 line-length = 88