diff --git a/appengine/standard/firebase/firenotes/backend/requirements.txt b/appengine/standard/firebase/firenotes/backend/requirements.txt
index d4e4be9c865..e5e4d4c567e 100644
--- a/appengine/standard/firebase/firenotes/backend/requirements.txt
+++ b/appengine/standard/firebase/firenotes/backend/requirements.txt
@@ -1,4 +1,4 @@
-Flask==0.11.1
+Flask==1.0
 pyjwt==1.4.2
 flask-cors==3.0.2
 google-auth==0.3.1