diff --git a/intro-cmx/cmx-03-notifications-python/requirements.txt b/intro-cmx/cmx-03-notifications-python/requirements.txt
index 6227a710d..44e768533 100644
--- a/intro-cmx/cmx-03-notifications-python/requirements.txt
+++ b/intro-cmx/cmx-03-notifications-python/requirements.txt
@@ -1,2 +1,2 @@
-Flask==0.12.2
+Flask==1.0
 requests==2.18.4