diff --git a/ch4/requirements.txt b/ch4/requirements.txt
index dfe86c4..5702433 100644
--- a/ch4/requirements.txt
+++ b/ch4/requirements.txt
@@ -5,7 +5,7 @@ scipy==1.16.3
 yfinance==0.2.66
 pytz==2025.2
 python-dateutil==2.9.0.post0
-requests==2.32.5
+requests==2.33.0
 networkx==3.6.1
 arch==8.0.0
 scikit-learn==1.8.0