diff --git a/tox.ini b/tox.ini
index 313e8a44..a5b340e2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist = pypy,py35,py27,pep8
-minversion = 1.6
+minversion = 2.0
 skipsdist = True
 
 [testenv]