diff --git a/composer.json b/composer.json
index a45a362..2bd7083 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": "~5.3|~7",
-        "symfony/framework-bundle": ">=2.3",
+        "symfony/framework-bundle": "~3.4|~4",
         "mangopay/php-sdk-v2": ">=2.0",
         "stof/doctrine-extensions-bundle": "~1.2",
         "troopers/ajax-bundle": "~1.2"