diff --git a/tox.ini b/tox.ini
index 032d3cc22..7d5eecb23 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 # py3 first to avoid .testrepository incompatibility
 envlist = py35,py27,pypy,pep8
-minversion = 1.6
+minversion = 2.3.2
 skipsdist = True
 
 [testenv]