diff --git a/composer.json b/composer.json
index c4de0ec..f4b7f1f 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   "description": "base server for swoft",
   "license": "Apache-2.0",
   "require": {
-    "swoft/stdlib": "dev-master"
+    "swoft/stdlib": "~2.0.0"
   },
   "autoload": {
     "psr-4": {