diff --git a/.travis.yml b/.travis.yml
index 70d0584..92f3094 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ jobs:
         - cd python
       script:
         - pytest
-        - mypy 1 2 3
+        - mypy 1 2 3 4 5
 
     - language: rust
       rust: stable