diff --git a/.travis.yml b/.travis.yml
index c357d75..3fbf7b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,17 @@
 language: python
 
+matrix:
+  include:
+    - language: generic
+      os: osx
+      osx_image: beta-xcode6.3
+
 python:
   - 2.7
 
 install:
-  - pip install tox
+  - sudo bash -c 'python2.7 <(curl https://bootstrap.pypa.io/get-pip.py)'
+  - sudo pip install tox
 
 script:
   - tox
diff --git a/tox.ini b/tox.ini
index aeb540a..e436ddc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ exclude =    .git
 ignore =     H102,E113,E121,E127,E128,H202,H301,H304,H405,H803
 
 [testenv]
-basepython = python2
+basepython = python2.7
 deps =       -rrequirements.txt
              -rtests/test_requirements.txt
 whitelist_externals =
@@ -41,9 +41,9 @@ commands =   {[testenv:build-whl]commands}
              pip wheel --wheel-dir=dist -rpex/pex_requirements.txt
              sh -c '{envdir}/bin/pex -v --disable-cache --no-index -f dist \
                 -c sphinxserve -o pex/scripts/sphinxserve dist/*'
-             sh -x -c 'sha1sum pex/scripts/sphinxserve'
+             sh -x -c 'openssl sha1 pex/scripts/sphinxserve'
              pip wheel --wheel-dir=dist pex/
-             sh -x -c 'sha1sum dist/sphinxserve_pex*'
+             sh -x -c 'openssl sha1 dist/sphinxserve_pex*'
 
 [testenv:dev]
 envdir =     /tmp/tox/dev