diff --git a/tox.ini b/tox.ini
index 1017cd406..1cfaa550b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py33, py34, py35, py36
+envlist = py27, py34, py35, py36
 
 [testenv]
 changedir = src