diff --git a/composer.json b/composer.json
index 6f021af..82796a8 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     }
   , "require": {
         "php": ">=5.3.9"
-      , "react/socket": "0.3.*"
+      , "react/socket": ">=0.3.0,<0.5-dev"
       , "guzzle/http": ">=3.6.0,<3.9.0-dev"
       , "symfony/http-foundation": "~2.2"
       , "symfony/routing": "~2.2"