diff --git a/ch13/requirements/requirements.txt b/ch13/requirements/requirements.txt
index 18b3bdb..d5dc306 100644
--- a/ch13/requirements/requirements.txt
+++ b/ch13/requirements/requirements.txt
@@ -164,7 +164,7 @@ matplotlib-inline==0.1.7
     # via
     #   ipykernel
     #   ipython
-mistune==3.3.0
+mistune==3.3.3
     # via nbconvert
 nbclient==0.10.0
     # via nbconvert