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..883fdbe 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	
@@ -1,6 +1,6 @@
 attrs==19.1.0
 bokeh==1.3.4
-certifi==2019.6.16
+certifi==2022.12.7
 chardet==3.0.4
 Click==7.0
 Flask==1.1.1