diff --git a/composer.json b/composer.json
index 15a284d..cd40ece 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
   ],
   "require": {
     "php": ">=5.5.0",
-    "symfony/http-kernel": "3.*",
+    "symfony/http-kernel": "3.*|4.*",
     "neomerx/json-api": "~0.6.0"
   },
   "require-dev": {