diff --git a/.travis.yml b/.travis.yml
index 0061fdc..4c50301 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,9 @@ language: python
 
 sudo: false
 
+# https://devguide.python.org/#branchstatus
 python:
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"