diff --git a/23. Application 8 - Buidling a Web-based Financial Graph/Web-App/demo/requirements.txt b/23. Application 8 - Buidling a Web-based Financial Graph/Web-App/demo/requirements.txt
index b201344..08317f2 100644
--- a/23. Application 8 - Buidling a Web-based Financial Graph/Web-App/demo/requirements.txt	
+++ b/23. Application 8 - Buidling a Web-based Financial Graph/Web-App/demo/requirements.txt	
@@ -18,7 +18,7 @@ Pillow==7.1.0
 pyparsing==2.4.2
 python-dateutil==2.8.0
 pytz==2019.2
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 six==1.12.0
 tornado==6.0.3