diff --git a/ch11/chapter_11_UNDER_40/requirements.txt b/ch11/chapter_11_UNDER_40/requirements.txt
index a8b804e26..324fdb5bc 100644
--- a/ch11/chapter_11_UNDER_40/requirements.txt
+++ b/ch11/chapter_11_UNDER_40/requirements.txt
@@ -3,7 +3,7 @@ cycler==0.10.0
 Keras==2.1.4
 matplotlib==2.1.2
 Murmur==0.1.3
-numpy==1.14.0
+numpy==1.22.0
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2018.3