diff --git a/composer.json b/composer.json
index 6faf5d49..6b4b9ba2 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     },
     "require": {
         "php": ">=5.6",
-        "symfony/event-dispatcher": "^2.7 | ^3",
+        "symfony/event-dispatcher": "^2.7|^3.0|^4.0",
         "voryx/thruway-common": "^1.0.3",
         "thruway/client": "^0.5.0",
         "react/event-loop": "^0.4.3",