diff --git a/composer.json b/composer.json
index f988fd9e..9da3f417 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,8 @@
         "squizlabs/php_codesniffer": "~2.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0"
+        "phpunit/phpunit": "~4.0",
+	"apigen/apigen": "~4.1.1"
     },
     "autoload": {
         "psr-4": {"Qiniu\\": "src/Qiniu"},