diff --git a/.travis.yml b/.travis.yml
index 6e10065..972d9c1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,10 +3,10 @@ language: python
 notifications:
   email: false
 python:
+  - 3.7-dev
   - 3.6
   - 3.5
   - 3.4
-  - 3.3
   - 2.7
   - pypy
 before_install: