diff --git a/.travis.yml b/.travis.yml
index 9465b5ae..e8214ae8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,37 +1,38 @@
 language: python
 sudo: false
 cache: pip
 
 python:
   - 2.7
   - 3.3
   - 3.4
   - 3.5
   - 3.5-dev
   - 3.6
   - 3.6-dev
   - 3.7-dev
+  - pypy3.3-5.2-alpha1
 
 env:
   - PYTHONHASHSEED=random
     TEST_REQUIRE="gevent greenlet geventhttpclient fastimport"
 
 matrix:
   include:
     - python: pypy
       env: TEST_REQUIRE=fastimport
 
 install:
   - travis_retry pip install -U pip coverage codecov $TEST_REQUIRE
 
 script:
   # Test without c extensions
   - python -m coverage run -p --source=dulwich -m unittest dulwich.tests.test_suite
 
   # Test with c extensions
   - python setup.py build_ext -i
   - python -m coverage run -p --source=dulwich -m unittest dulwich.tests.test_suite
 
 after_success:
   - python -m coverage combine
   - codecov