diff --git a/app/common/library/AdminTotp.php b/app/common/library/AdminTotp.php
index dfcbc6c..bddd206 100644
--- a/app/common/library/AdminTotp.php
+++ b/app/common/library/AdminTotp.php
@@ -27,7 +27,8 @@ class AdminTotp
             if ($issuer === '') {
                 $issuer = 'BuildAdmin';
             }
-            self::$tfa = new TwoFactorAuth(new BaconQrCodeProvider(), $issuer);
+            // 使用 SVG 格式，避免依赖 imagick 扩展（PNG 默认需要 ImagickImageBackEnd）
+            self::$tfa = new TwoFactorAuth(new BaconQrCodeProvider(format: 'svg'), $issuer);
         }
         return self::$tfa;
     }