diff --git a/code/Ch4/pyproject.toml b/code/Ch4/pyproject.toml
index ac71d4e..3154c2a 100644
--- a/code/Ch4/pyproject.toml
+++ b/code/Ch4/pyproject.toml
@@ -96,7 +96,7 @@ dependencies = [
     "traitlets==5.14.3",
     "typing-extensions==4.15.0",
     "tzdata==2025.2",
-    "urllib3==2.5.0",
+    "urllib3==2.6.0",
     "wcwidth==0.2.14",
     "yarl==1.22.0",
 ]