diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index ade1bdf..16ea9c0 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -16,6 +16,7 @@ import asyncio
 import sys
 import os
 from django.db.models import Q
+from django.utils import timezone
 
 # config.email = "caoqianming@foxmail.com"
 config.email = "caoqianming@ctc.ac.cn"
@@ -368,7 +369,7 @@ def release_working_paper(minutes=10):
     qs = Paper.objects.filter(fetch_status="downloading")
     count = 0
     for paper in qs:
-        if paper.update_time < datetime.now() - timedelta(minutes=minutes):
+        if paper.update_time < timezone.now() - timedelta(minutes=minutes):
             paper.fetch_end()
             count += 1
     return f"release {count} papers"