diff --git a/tox.ini b/tox.ini
index a3c2792a79..50615772c2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist = py35,py36,py27,pep8,docs
-minversion = 1.6
+minversion = 2.0
 skipsdist = True
 
 [testenv]