diff --git a/tox.ini b/tox.ini
index 06d1476..e51d0b6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -134,7 +134,7 @@ commands =
 commands =
     {envpython} -m pip install --use-pep517 -e .[testing,optional]
 
-    {envpython} -m my.core module install --parallel \
+    {envpython} -m my.core module install \
         my.arbtt                  \
         my.browser.export         \
         my.coding.commits         \