diff --git a/.travis.yml b/.travis.yml
index 6aefeaa..a2e002a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,17 +3,18 @@ php:
   - 5.3.3
   - 5.3
   - 5.4
+  - 5.5
 
 script:
- - vendor/phpunit/phpunit/composer/bin/phpunit
+ - vendor/bin/phpunit
 
 before_script:
  - sudo apt-get -qq update > /dev/null
  - phpenv rehash > /dev/null
  - composer selfupdate --quiet
- - composer install --dev 
- - vendor/phpunit/phpunit/composer/bin/phpunit
- - composer update --dev 
+ - composer install --dev --prefer-source
+ - vendor/bin/phpunit
+ - composer update --dev --prefer-source
 
 notifications:
   irc: "irc.freenode.org#phpdocumentor"