diff --git a/ch05/code/requirements.txt b/ch05/code/requirements.txt
index 7c95617bc..6218c04de 100644
--- a/ch05/code/requirements.txt
+++ b/ch05/code/requirements.txt
@@ -18,7 +18,7 @@ pydot == 1.2.4
 
 # malware_detector.py: 40,52
 # sim_system.py: 7
-numpy == 1.12.1
+numpy == 1.21.0
 
 # malware_detector.py: 48,49,50
 scikit-learn == 0.19.1