diff --git a/.travis.yml b/.travis.yml
index 83b0fc7fd68..4ee974e8999 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,7 @@ addons:
     packages:
       - python2.4
 install:
-  - pip install tox
+  - pip install tox PyYAML Jinja2 sphinx
 script:
   - tox
   - make -C docsite all