diff --git a/.travis.yml b/.travis.yml
index d6d5ddd1..673ce067 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,9 @@ env:
     - secure: "Sq+6bVtnPsu0mWX8DWQ+9bGAjxMcGorksUiHc4YIXEJsuDfVmVlH8tTD547IeCjDAx9MxXerZ2Z4HSjxTB70VEnJPvZMHI/EZn4Ny31YLHEthdZbV5Gd1h0TGp8VOzPKGShvGrtGBX6MvMfgpK4zuieVWbSfdKeecm8ZNLMpUd4="
 
 before_script:
+  ## Packages
+  - sudo apt-get -qq update > /dev/null
+  - sudo apt-get -qq install graphviz > /dev/null
   ## Composer
   # - curl -s http://getcomposer.org/installer | php
   # - php composer.phar install --prefer-source