diff --git a/tox.ini b/tox.ini
index 1a3e5db..7a2d24a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py26
+envlist = py26, py27, py33, py34
 [testenv]
 deps =
     -rdev-requirements.txt