diff --git a/Ch9/server/requirements.txt b/Ch9/server/requirements.txt
index 695e16f..43daf86 100644
--- a/Ch9/server/requirements.txt
+++ b/Ch9/server/requirements.txt
@@ -1,4 +1,4 @@
-arrow==0.12.1
+arrow==0.15.1
 certifi==2018.1.18
 chardet==3.0.4
 click==6.7