diff --git a/app/Login.py b/app/Login.py
index 1192240..14ad09e 100644
--- a/app/Login.py
+++ b/app/Login.py
@@ -18,7 +18,7 @@ def verify_user(username, password):
 
 def add_user(username, password):
     start_date = datetime.now().strftime('%Y%m%d')
-    expiry_date = '20211230'
+    expiry_date = '20221230'
     # 将用户名和密码一起加密，以免暴露不同用户的相同密码
     password = md5(username + password)
     rq = InsertQuery(path_prefix + 'static/wordfreqapp.db')