diff --git a/tox.ini b/tox.ini
index 12471d7..7e793a5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,11 @@ envlist =
     py36
     flake
 
+[travis]
+python =
+    3.5: py35, flake
+    3.6: py36
+
 [testenv]
 commands = py.test
 deps =