diff --git a/Wechat/Oauth.php b/Wechat/Oauth.php
index 52362be..da2f767 100644
--- a/Wechat/Oauth.php
+++ b/Wechat/Oauth.php
@@ -53,7 +53,7 @@ class Oauth extends Wechat
     }
 
     /**
-     * 刷新access token并续期
+     * 刷新AccessToken并续期
      * @param string $refresh_token
      * @return bool|array
      */
diff --git a/composer.json b/composer.json
index 33573e8..d6b84b2 100644
--- a/composer.json
+++ b/composer.json
@@ -10,8 +10,8 @@
     "wxpay"
   ],
   "require": {
+    "php": ">=5.4",
     "ext-curl": "*",
-    "php": ">=5.3.3",
     "ext-openssl": "*"
   },
   "autoload": {