diff --git a/Chapter11/app/requirements.txt b/Chapter11/app/requirements.txt
index 5b5a84c..3b3644e 100644
--- a/Chapter11/app/requirements.txt
+++ b/Chapter11/app/requirements.txt
@@ -110,7 +110,7 @@ twine==1.13.0
 Twisted==18.9.0
 unicodecsv==0.14.1
 uritemplate==3.0.0
-urllib3==1.24.1
+urllib3==1.26.5
 utils==0.9.0
 virtualenv==16.4.3
 w3lib==1.20.0