diff --git a/composer.json b/composer.json
index 0404721..b9d4ac5 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     "require": {
         "php": "^5.5|^7.0",
         "symfony/symfony"                : "^2.7|^3.0",
-        "react/react"                    : "^0.4"
+        "react/react"                    : "0.4.1"
         
     },
     "require-dev": {