diff --git a/Chapter-4/activity_1/requirements.txt b/Chapter-4/activity_1/requirements.txt
index 424e5fb..6e00857 100644
--- a/Chapter-4/activity_1/requirements.txt
+++ b/Chapter-4/activity_1/requirements.txt
@@ -75,7 +75,7 @@ testpath==0.3.1
 tornado==4.5.2
 tqdm==4.19.4
 traitlets==4.3.2
-urllib3==1.22
+urllib3==1.26.5
 wcwidth==0.1.7
 Werkzeug==0.13
 widgetsnbextension==3.0.8