diff --git a/Chapter11/app/requirements.txt b/Chapter11/app/requirements.txt
index 5b5a84c..c069b3d 100644
--- a/Chapter11/app/requirements.txt
+++ b/Chapter11/app/requirements.txt
@@ -8,7 +8,7 @@ gym==0.14.0
 h5py==2.8.0
 heapdict==1.0.0
 html5lib==1.0.1
-httplib2==0.13.1
+httplib2==0.19.0
 hyperlink==18.0.0
 idna==2.8
 imageio==2.4.1