diff --git a/MasteringPythonNetworkingSecondEdition_Code/Chapter09/requirements.txt b/MasteringPythonNetworkingSecondEdition_Code/Chapter09/requirements.txt
index 980d094..f9687e0 100644
--- a/MasteringPythonNetworkingSecondEdition_Code/Chapter09/requirements.txt
+++ b/MasteringPythonNetworkingSecondEdition_Code/Chapter09/requirements.txt
@@ -1,4 +1,4 @@
-Flask==0.10.1
+Flask==1.0
 Flask-HTTPAuth==2.2.1
 Flask-SQLAlchemy==1.0
 Jinja2==2.7.3