diff --git a/composer.json b/composer.json
index fb2939d..d7a09ec 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "php": ">=5.4"
       , "evenement/evenement": "^3.0 || ^2.0"
       , "guzzlehttp/psr7": "^2.0 || ^1.7"
-      , "ratchet/rfc6455": "^0.3"
+      , "ratchet/rfc6455": "^0.3.1"
       , "react/socket": "^1.9"
     }
   , "require-dev": {