diff --git a/tox.ini b/tox.ini
index 910c4f4..5ae5d81 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27
+envlist = py27,py34,py35
 
 [testenv]
 deps =