diff --git a/composer.json b/composer.json
index 9660ec8..2f78575 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license" : "MIT",
     "require": {
         "php": ">=5.4",
-        "workerman/workerman": ">=3.5.0"
+        "workerman/workerman": ">=4.0.5"
     },
     "autoload": {
         "psr-4": {"Workerman\\Redis\\": "./src"}