diff --git a/sample1/requirements.txt b/sample1/requirements.txt
index ec8de5d..716f4ad 100644
--- a/sample1/requirements.txt
+++ b/sample1/requirements.txt
@@ -1,6 +1,6 @@
 celery==4.1.0
 celery[redis]
 redis==2.10.6
-Flask==0.12
+Flask==1.0
 Flask-Cors==3.0.3
 flower==0.9.2