diff --git a/tox.ini b/tox.ini
index 9415b1c..67dd03f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
-minversion = 1.6
-envlist = py27,py35,pypy,pep8
+minversion = 2.0
+envlist = py36,py27,pep8
 skipsdist = True
 
 [testenv]