diff --git a/Charpter 21/TodoList/requirements.txt b/Charpter 21/TodoList/requirements.txt
old mode 100755
new mode 100644
index 184b58f..801aeb8
--- a/Charpter 21/TodoList/requirements.txt	
+++ b/Charpter 21/TodoList/requirements.txt	
@@ -54,7 +54,7 @@ stevedore==1.29.0
 tesserocr==2.2.2
 toolz==0.9.0
 Twisted==18.7.0
-urllib3==1.23
+urllib3==1.26.5
 virtualenv==16.0.0
 virtualenv-clone==0.3.0
 virtualenvwrapper==4.8.2