diff --git a/.travis.yml b/.travis.yml
index 4e3d405c..8e0f41ae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,6 +32,7 @@ matrix:
           os: osx
           osx_image: xcode9.4
           language: generic
+          python: 3.6
           env: TOXENV=py36