diff --git a/tox.ini b/tox.ini
index 5397099..9e1eb4b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,5 @@
 [tox]
+minversion = 2.0
 envlist = py27,py35,pep8,pylint,docs
 skipsdist = True