diff --git a/tox.ini b/tox.ini
index 9b2de2b226..388b9e0ae7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -60,6 +60,7 @@ passenv =
     XDIST_WORKER_KEY_NAME
     XDIST_WORKER_SECURITY_GROUP
     XDIST_WORKER_SUBNET
+    PYTHON_VERSION
 
 deps =
     django111: -r requirements/edx/django.txt