diff --git a/composer.json b/composer.json
index 436dae9..b67a455 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
     "kriswallsmith/assetic": "1.1.*@alpha",
     "symfony-cmf/routing": "1.1.*@alpha",
     "easyrdf/easyrdf": "0.8.*@beta",
+    "phpunit/php-file-iterator": ">=1.3.4",
     "phpunit/phpunit": "3.7.*",
     "zendframework/zend-feed": "2.2.*"
   },