diff --git a/.travis.yml b/.travis.yml
index df9a37b73..fe3b3fcf0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,10 @@ language: python
 sudo: false
 python:
   - "2.7"
+  - pypy
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
-  - "pip install --src . -r requirements.txt"
+  - "pip install --upgrade --src . -r requirements.txt"
 # command to run tests, e.g. python setup.py test
 script: 
   - "nosetests --with-cov --cov-report term-missing"