diff --git a/tox.ini b/tox.ini
index f783a51..3d9f5ac 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,6 +12,7 @@ python =
 
 [testenv]
 passenv = *
+download = true
 extras = dev
 commands =
     {posargs:inv ci}