diff --git a/tox.ini b/tox.ini
index 2e2707b..85a51cf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,10 @@
 [tox]
+minversion = 1.6
 envlist =
     py26,py27,py32,py33,py34
 
 [testenv]
+usedevelop = True
 deps =
 commands =
     python setup.py test -q