diff --git a/celery_demo/demo5_flask/requirements.txt b/celery_demo/demo5_flask/requirements.txt
index 33a41d4..031541c 100644
--- a/celery_demo/demo5_flask/requirements.txt
+++ b/celery_demo/demo5_flask/requirements.txt
@@ -1,3 +1,3 @@
 Flask==1.0.2
 redis==2.10.6
-celery==4.2.1
+celery==5.2.2