diff --git a/README.md b/README.md
index 0fced29..4a6c25c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # think-captcha
-thinkphp5 验证码类库
+thinkphp5.1 验证码类库
 
 ## 安装
 > composer require topthink/think-captcha
diff --git a/composer.json b/composer.json
index 272e516..d5350d4 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,9 @@
         }
     ],
     "license": "Apache-2.0",
-    "require": {},
+    "require": {
+    	"topthink/framework": "5.1.*"
+    },
     "autoload": {
         "psr-4": {
             "think\\captcha\\": "src/"
diff --git a/src/Captcha.php b/src/Captcha.php
index 09ad692..29f9dad 100644
--- a/src/Captcha.php
+++ b/src/Captcha.php
@@ -11,7 +11,7 @@
 
 namespace think\captcha;
 
-use think\Session;
+use think\facade\Session;
 
 class Captcha
 {
diff --git a/src/CaptchaController.php b/src/CaptchaController.php
index 8a0535d..5720392 100644
--- a/src/CaptchaController.php
+++ b/src/CaptchaController.php
@@ -11,13 +11,13 @@
 
 namespace think\captcha;
 
-use think\Config;
+use think\facade\Config;
 
 class CaptchaController
 {
     public function index($id = "")
     {
-        $captcha = new Captcha((array)Config::get('captcha'));
+        $captcha = new Captcha((array) Config::pull('captcha'));
         return $captcha->entry($id);
     }
-}
\ No newline at end of file
+}
diff --git a/src/helper.php b/src/helper.php
index 914c749..7dd3cfb 100644
--- a/src/helper.php
+++ b/src/helper.php
@@ -9,14 +9,13 @@
 // | Author: yunwuxin <448901948@qq.com>
 // +----------------------------------------------------------------------
 
-\think\Route::get('captcha/[:id]', "\\think\\captcha\\CaptchaController@index");
+Route::get('captcha/[:id]', "\\think\\captcha\\CaptchaController@index");
 
-\think\Validate::extend('captcha', function ($value, $id = '') {
+Validate::extend('captcha', function ($value, $id = '') {
     return captcha_check($value, $id);
 });
 
-\think\Validate::setTypeMsg('captcha', ':attribute错误!');
-
+Validate::setTypeMsg('captcha', ':attribute错误!');
 
 /**
  * @param string $id
@@ -29,17 +28,15 @@ function captcha($id = '', $config = [])
     return $captcha->entry($id);
 }
 
-
 /**
  * @param $id
  * @return string
  */
 function captcha_src($id = '')
 {
-    return \think\Url::build('/captcha' . ($id ? "/{$id}" : ''));
+    return Url::build('/captcha' . ($id ? "/{$id}" : ''));
 }
 
-
 /**
  * @param $id
  * @return mixed
@@ -49,7 +46,6 @@ function captcha_img($id = '')
     return '<img src="' . captcha_src($id) . '" alt="captcha" />';
 }
 
-
 /**
  * @param        $value
  * @param string $id
@@ -58,6 +54,6 @@ function captcha_img($id = '')
  */
 function captcha_check($value, $id = '')
 {
-    $captcha = new \think\captcha\Captcha((array)\think\Config::get('captcha'));
+    $captcha = new \think\captcha\Captcha((array) Config::pull('captcha'));
     return $captcha->check($value, $id);
 }