diff --git a/.travis.yml b/.travis.yml
index 2c621c8..de2b1f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,21 @@
 language: python
-
-python:
-  - "2.7"
-  - "3.6"
-  - "nightly"
 cache: pip
+sudo: false
+
+matrix:
+  include:
+    - python: 2.7
+    - python: 3.4
+    - python: 3.5
+    - python: 3.6
+    - python: 3.7
+      dist: xenial
+      sudo: yes
+    - python: nightly
+      dist: xenial
+      sudo: yes
+    - python: pypy
+    - python: pypy3
+
 script:
   - python setup.py test