diff --git a/composer.json b/composer.json
index c9628cd..e735663 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "doctrine/orm": "^2.6",
     "hashids/hashids": "^2.0",
     "sensio/framework-extra-bundle": "^3.0",
-    "symfony/http-kernel": "^3.3"
+    "symfony/http-kernel": "~3.3|~4.0"
   },
   "require-dev": {
     "bossa/phpspec2-expect": "^3.0",