diff --git a/oj/local_settings.py b/oj/local_settings.py
index 77b1bca..bd74e35 100644
--- a/oj/local_settings.py
+++ b/oj/local_settings.py
@@ -30,7 +30,8 @@ REDIS_QUEUE = {
 
 # for celery
 BROKER_URL = 'redis://%s:%s/%s' % (REDIS_QUEUE["host"], str(REDIS_QUEUE["port"]), str(REDIS_QUEUE["db"]))
-ACCEPT_CONTENT = ['json']
+CELERY_ACCEPT_CONTENT = ["json"]
+CELERY_TASK_SERIALIZER = "json"
 
 
 DEBUG = True
diff --git a/oj/server_settings.py b/oj/server_settings.py
index b09a229..3a566dd 100644
--- a/oj/server_settings.py
+++ b/oj/server_settings.py
@@ -39,7 +39,8 @@ REDIS_QUEUE = {
 
 # for celery
 BROKER_URL = 'redis://%s:%s/%s' % (REDIS_QUEUE["host"], str(REDIS_QUEUE["port"]), str(REDIS_QUEUE["db"]))
-ACCEPT_CONTENT = ['json']
+CELERY_ACCEPT_CONTENT = ["json"]
+CELERY_TASK_SERIALIZER = "json"
 
 
 DEBUG = False