diff --git a/bin/bootstrap.php b/bin/bootstrap.php
index fe6616c4..4c684367 100644
--- a/bin/bootstrap.php
+++ b/bin/bootstrap.php
@@ -1,8 +1,8 @@
 <?php
 define("ROOT_PATH", dirname(__DIR__));
-define('DEBUG', true);
-define('VERSION', '0.4.1');
-define('WEBSITE', 'https://www.swoole.com/aot/');
+const DEBUG = true;
+const VERSION = '0.4.1';
+const WEBSITE = 'https://www.swoole.com/aot/';
 
 require ROOT_PATH . '/vendor/autoload.php';
 require ROOT_PATH . '/src/functions.php';
\ No newline at end of file