diff --git a/README.md b/README.md
index 4e52def..fcd7b0e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # think-view
 
-ThinkPHP6.0 Think-Template模板引擎驱动
+ThinkPHP8.0 Think-Template模板引擎驱动
 
 
 ## 安装
@@ -11,7 +11,7 @@ composer require topthink/think-view
 
 ## 用法示例
 
-本扩展不能单独使用，依赖ThinkPHP6.0+
+本扩展不能单独使用，依赖ThinkPHP8.0+
 
 首先配置config目录下的template.php配置文件，然后可以按照下面的用法使用。
 
diff --git a/composer.json b/composer.json
index f4e6431..d9bcca7 100644
--- a/composer.json
+++ b/composer.json
@@ -9,8 +9,8 @@
         }
     ],
     "require": {
-    	"php": ">=7.1.0",
-        "topthink/think-template": "^2.0"
+    	"php": ">=8.0.0",
+        "topthink/think-template": "^3.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Think.php b/src/Think.php
index 562b54a..105b070 100644
--- a/src/Think.php
+++ b/src/Think.php
@@ -21,7 +21,6 @@ class Think
 {
     // 模板引擎实例
     private $template;
-    private $app;
 
     // 模板引擎参数
     protected $config = [
@@ -39,10 +38,8 @@ class Think
         'tpl_cache'     => true,
     ];
 
-    public function __construct(App $app, array $config = [])
+    public function __construct(private App $app, array $config = [])
     {
-        $this->app = $app;
-
         $this->config = array_merge($this->config, (array) $config);
 
         if (empty($this->config['cache_path'])) {
@@ -55,30 +52,15 @@ public function __construct(App $app, array $config = [])
             $type  = strtoupper(trim(array_shift($vars)));
             $param = implode('.', $vars);
 
-            switch ($type) {
-                case 'CONST':
-                    $parseStr = strtoupper($param);
-                    break;
-                case 'CONFIG':
-                    $parseStr = 'config(\'' . $param . '\')';
-                    break;
-                case 'LANG':
-                    $parseStr = 'lang(\'' . $param . '\')';
-                    break;
-                case 'NOW':
-                    $parseStr = "date('Y-m-d g:i a',time())";
-                    break;
-                case 'LDELIM':
-                    $parseStr = '\'' . ltrim($this->getConfig('tpl_begin'), '\\') . '\'';
-                    break;
-                case 'RDELIM':
-                    $parseStr = '\'' . ltrim($this->getConfig('tpl_end'), '\\') . '\'';
-                    break;
-                default:
-                    $parseStr = defined($type) ? $type : '\'\'';
-            }
-
-            return $parseStr;
+            return match ($type) {
+                'CONST'     =>  strtoupper($param),
+                'CONFIG'    =>  'config(\'' . $param . '\')',
+                'LANG'      =>  'lang(\'' . $param . '\')',
+                'NOW'       =>  "date('Y-m-d g:i a',time())",
+                'LDELIM'    =>  '\'' . ltrim($this->getConfig('tpl_begin'), '\\') . '\'',
+                'RDELIM'    =>  '\'' . ltrim($this->getConfig('tpl_end'), '\\') . '\'',
+                default     =>  defined($type) ? $type : '\'\'',
+            };
         });
 
         $this->template->extend('$Request', function (array $vars) {