diff --git a/.travis.yml b/.travis.yml
index f2a21aa..62586e4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,6 +27,14 @@ matrix:
           os: linux
           dist: xenial
           env: TOXENV=py37
+        - language: generic
+          os: osx
+          osx_image: xcode9.4
+          env: TOXENV=py27,py36
+        - language: generic
+          os: osx
+          osx_image: xcode10.1
+          env: TOXENV=py27,py37
 
-install: pip install tox-travis
+install: pip install tox
 script: tox
diff --git a/tox.ini b/tox.ini
index 6d767f1..be2f3ae 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
-envlist = py27,py36
+envlist = py{27,34,35,36,37},pypy
+skip_missing_interpreters=true
 
 [testenv]
 commands=python test/run_tests.py