diff --git a/config/captcha.php b/config/captcha.php
index e1f41ee2..02d591cb 100644
--- a/config/captcha.php
+++ b/config/captcha.php
@@ -7,7 +7,7 @@ return [
     //验证码位数
     'length'   => 5,
     // 验证码字符集合
-    'codeSet'  => '2345678abcdefhijkmnpqrstuvwxyzABCDEFGHJKLMNPQRTUVWXY',
+    'codeSet'  => '0123456789abcdefghijklmnopqrstuvwxyz',
     // 验证码过期时间
     'expire'   => 300,
     // 是否使用中文验证码