diff --git a/.travis.yml b/.travis.yml
index 74a79df42..ab698716b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,8 +10,14 @@ python:
     - 3.4
     - 3.5
     - pypy
+    - pypy3
+
+env:
+    - DATEUTIL=python-dateutil==2.2
+    - DATEUTIL=python-dateutil
 
 install:
+    - pip install $DATEUTIL
     - python setup.py install
     - if [[ $TRAVIS_PYTHON_VERSION == 2.6 ]]; then pip install flake8==2.6.2; fi
     - if [[ $TRAVIS_PYTHON_VERSION != 2.6 ]]; then pip install flake8; fi