diff --git a/Chapter11/app/requirements.txt b/Chapter11/app/requirements.txt
index 5b5a84c..0728d48 100644
--- a/Chapter11/app/requirements.txt
+++ b/Chapter11/app/requirements.txt
@@ -17,7 +17,7 @@ importlib-metadata==0.6
 imutils==0.5.2
 incremental==17.5.0
 intervaltree==3.0.2
-numpy==1.17.1
+numpy==1.22.0
 numpydoc==0.8.0
 oauth2client==4.1.3
 olefile==0.46