diff --git a/.circleci/config.yml b/.circleci/config.yml
index 562a953..93f0f4f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -15,6 +15,7 @@ jobs:
             virtualenv airbrake
             source airbrake/bin/activate
             pip install tox tox-pyenv
+            pyenv local 2.7.15 3.4.6 3.5.5
             tox -v --recreate
 
 workflows: