diff --git a/plugins/sign_in/group_user_checkin.py b/plugins/sign_in/group_user_checkin.py
index 3e5f1417..209e7d73 100644
--- a/plugins/sign_in/group_user_checkin.py
+++ b/plugins/sign_in/group_user_checkin.py
@@ -16,6 +16,7 @@ import aiohttp
 import math
 import asyncio
 import os
+import secrets
 
 
 async def group_user_check_in(
@@ -41,7 +42,7 @@ async def _handle_check_in(
     nickname: str, user_qq: int, group: int, present: datetime
 ) -> MessageSegment:
     user = await SignGroupUser.ensure(user_qq, group, for_update=True)
-    impression_added = float(random.randint(10, 100))/100
+    impression_added = (secrets.randbelow(90)+10)/100
     critx2 = random.random()
     add_probability = user.add_probability
     specify_probability = user.specify_probability