diff --git a/oj/settings.py b/oj/settings.py
index b994539..2784b6e 100644
--- a/oj/settings.py
+++ b/oj/settings.py
@@ -225,7 +225,7 @@ def redis_config(db):
 
 CACHES = {"default": redis_config(db=1)}
 
-SESSION_ENGINE = "django.contrib.sessions.backends.cache"
+SESSION_ENGINE = "django.contrib.sessions.backends.cached_db"
 SESSION_CACHE_ALIAS = "default"
 
 # Channels Configuration