diff --git a/ch09/requirements.txt b/ch09/requirements.txt
index d667a6b..c955623 100644
--- a/ch09/requirements.txt
+++ b/ch09/requirements.txt
@@ -1,4 +1,4 @@
-mistune==3.2.0
+mistune==3.2.1
 jinja2==3.1.6
 requests==2.32.5
 twilio==9.10.2