diff --git a/tox.ini b/tox.ini
index 5bc3522..24fce8a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,pep8
+envlist = py35,py34,py27,pep8
 
 [testenv]
 install_command = pip install -U {opts} {packages}