diff --git a/composer.json b/composer.json
index a1112a3..0c13f93 100644
--- a/composer.json
+++ b/composer.json
@@ -12,9 +12,9 @@
     "require": {
         "php": ">=5.5.0",
         "psr/log": "~1.0",
-        "symfony/event-dispatcher": "~2.5|~3.0",
-        "symfony/serializer": "~2.5|~3.0",
-        "symfony/dependency-injection": "~2.5|3.0",
+        "symfony/event-dispatcher": "~2.5|~3.0|~4.0",
+        "symfony/serializer": "~2.5|~3.0|~4.0",
+        "symfony/dependency-injection": "~2.5|3.0|~4.0",
         "doctrine/inflector": "~1.0"
     },
     "autoload": {