diff --git a/.travis.yml b/.travis.yml
index 870bcd4..f78b89e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ addons:
     sources:
       - deadsnakes
     packages:
+      - pypy
       - python3.5
 
 python: 3.6