diff --git a/.travis.yml b/.travis.yml
index 417d67855b..1f6844c672 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ rust:
   - stable
   - beta
   - nightly
+python: "3.6"
 install: pip install --user --upgrade mypy flake8
 script: ./test-all.sh
 cache: