diff --git a/chapter4/jupyter/requirements.txt b/chapter4/jupyter/requirements.txt
index 67cd5cb..960f30f 100644
--- a/chapter4/jupyter/requirements.txt
+++ b/chapter4/jupyter/requirements.txt
@@ -1,4 +1,4 @@
-numpy==1.15.1
+numpy==1.22.0
 pandas==0.23.4
 matplotlib==2.2.3
 prompt-toolkit==2.0.4