diff --git a/docker/test_base/entry_point.sh b/docker/test_base/entry_point.sh
index 4416da4cc..4ab2779e1 100644
--- a/docker/test_base/entry_point.sh
+++ b/docker/test_base/entry_point.sh
@@ -13,4 +13,5 @@ echo "execute test with coverage"
 cd ${TEST_ROOT}
 hatch env create dev
 hatch run dev:coverage run -m pytest --junit-xml=${OUTPUT_DIR}/pytest.xml ${@:-}
+hatch run dev:coverage combine
 hatch run dev:coverage xml -o ${OUTPUT_DIR}/coverage.xml
diff --git a/pyproject.toml b/pyproject.toml
index 82069ea5d..c98830edf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,7 @@ concurrency = [
 ]
 branch = false
 relative_files = true
+parallel = true
 source = [
   "otaclient",
   "otaclient_api",