diff --git a/Ch9/server/requirements.txt b/Ch9/server/requirements.txt
index 695e16f..fc79e01 100644
--- a/Ch9/server/requirements.txt
+++ b/Ch9/server/requirements.txt
@@ -1,5 +1,5 @@
 arrow==0.12.1
-certifi==2018.1.18
+certifi==2022.12.7
 chardet==3.0.4
 click==6.7
 Flask==1.0