diff --git a/tox.ini b/tox.ini
index e83003f..04782a1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,7 +14,7 @@ deps = coverage
 
 commands =
     python manage.py compilemessages -i .tox -i venv
-    coverage run --source=api,draw,logs,participation,registration,tfjm ./manage.py test api/ chat/ draw/ logs/ participation/ registration/ tfjm/
+    coverage run --source=api,draw,logs,participation,registration,tfjm ./manage.py test --parallel=1 api/ chat/ draw/ logs/ participation/ registration/ tfjm/
     coverage report -m
 
 [testenv:linters]