diff --git a/composer.json b/composer.json
index 947e431..1e853b5 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "symfony/routing": "2.5.*",
     "symfony/serializer": "2.5.*",
     "symfony/validator": "2.5.*",
-    "symfony/yaml": "2.5.*",
+    "symfony/yaml": "dev-master#499f7d7aa96747ad97940089bd7a1fb24ad8182a as 2.5.0",
     "twig/twig": "1.16.*",
     "doctrine/common": "2.4.*",
     "doctrine/annotations": "1.2.*",