diff --git a/pyproject.toml b/pyproject.toml
index 15a0be6c..cd3a0bbb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -87,8 +87,10 @@ namespaces = true # enable data directory to be identified
 
 [tool.pytest.ini_options]
 minversion = "6.0"
-# pytest options: -ra: show summary info for all test outcomes; -n auto: run tests in parallel; --dist loadscope: distribute tests by loading scope
-addopts = "-ra -n auto --dist loadscope"    
+# -ra: show summary info for all test outcomes; 
+# -n auto: run tests in parallel; 
+# --dist loadgroup: sends tests marked with 'xdist_group' to the same worker
+addopts = "-ra -n auto --dist loadgroup"    
 testpaths = ["tests/unit"]
 
 [tool.coverage.run]