diff --git a/composer.json b/composer.json
index 1839359..793ff78 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,8 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=5.3.3",
-        "symfony/framework-bundle": ">=2.7"
+        "symfony/framework-bundle": ">=2.7",
+        "jms/metadata": "^1.5"
     },
     "require-dev": {
         "symfony/symfony": ">=2.7",