diff --git a/applications/common/utils/gen_captcha.py b/applications/common/utils/gen_captcha.py
index 622a6e1..12c490e 100644
--- a/applications/common/utils/gen_captcha.py
+++ b/applications/common/utils/gen_captcha.py
@@ -4,7 +4,7 @@ from PIL import Image
 from random import choices
 
 
-def gen_captcha(content='0123456789'):
+def gen_captcha(content='2345689abcdefghijklmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ'):
     """ 生成验证码 """
     image = ImageCaptcha()
     # 获取字符串