diff --git a/bin/start b/bin/start
index b141b3f2..2ce8d94a 100755
--- a/bin/start
+++ b/bin/start
@@ -29,11 +29,11 @@ switch ($argv[1] ?? '') {
     case 'server':
         if(!is_dir(__DIR__.'/../vendor/')){
             echo "Warning: you have not update composer!\n";
-            echo "You need to run \"composer update\" at root of zhamao-framework!\n";
-            echo "Or if you are using docker or composer installed, just run \"sh bin/update-composer\"\n";
-            echo "In China, if your composer downloading slowly, you can get latest vendor.tar.gz from HERE:\n";
-            echo "https://dl2.zhamao.xin/zhamao-framework/vendor.tar.gz\n";
-            die;
+            $r = Co::exec("composer update");
+            if($r['code'] != 0) {
+                echo "You need to run \"composer update\" at root of zhamao-framework!\n";
+                die;
+            }
         }
         $loader = new FrameworkLoader($argv);
         break;