diff --git a/tox.ini b/tox.ini
index 00ecc39..025548f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py27,pep8,eslint,karma
+envlist = py27,py35,pep8,eslint,karma
 skipsdist = True
 
 [testenv]