diff --git a/composer.json b/composer.json
index 70a1eda..033439f 100644
--- a/composer.json
+++ b/composer.json
@@ -21,6 +21,7 @@
         "meta-tech/silex-controller-service" : "^1.0",
         "silex/silex": "^2.0",
         "gecko-packages/gecko-silex-config-service": "^2.0",
-        "symfony/security": "^3.2"
+        "symfony/security": "^3.2",
+        "symfony/yaml": "^3.2"
     }
 }