diff --git a/tox.ini b/tox.ini
index 56ef18f9..40f70612 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,7 @@ envlist=
 [testenv]
 deps=
     unittest2
+    -rrequirements-ext.txt
 extras=
     yaml
 commands=