diff --git a/courses/developingapps/python/pubsub-languageapi-spanner/end/requirements.txt b/courses/developingapps/python/pubsub-languageapi-spanner/end/requirements.txt
index d5e5593c29..8ef034d91e 100644
--- a/courses/developingapps/python/pubsub-languageapi-spanner/end/requirements.txt
+++ b/courses/developingapps/python/pubsub-languageapi-spanner/end/requirements.txt
@@ -1,4 +1,4 @@
-Flask==0.12
+Flask==1.0
 google-cloud==0.27.0
 google-cloud-core==0.27.1
 google-cloud-pubsub==0.28.3