composer is preinstalled, but just to be extra sure, lets update it to the latest version

.travis.yml

@@ -5,8 +5,8 @@ php:
   - 5.4
 
 before_script:
-    - curl -s http://getcomposer.org/installer | php
-    - php composer.phar install --dev
+    - comoser self-update
+    - composer install --dev
 
 script: phpunit --coverage-clover clover