@@ -50,6 +50,8 @@ matrix:
     # https://github.com/travis-ci/travis-ci/issues/4794#issuecomment-143758799
     - env: TOXENV=py35
       python: 3.5
+    - env: TOXENV=py35-oldest
+      python: 3.5
 
 # source is used mainly for eval+gimme, so `install` can use the right
 # Go environment