diff --git a/books/software-architecture-with-python/Chapter05-scalability-performance/requirements.txt b/books/software-architecture-with-python/Chapter05-scalability-performance/requirements.txt
index 33c0524..3133195 100644
--- a/books/software-architecture-with-python/Chapter05-scalability-performance/requirements.txt
+++ b/books/software-architecture-with-python/Chapter05-scalability-performance/requirements.txt
@@ -11,7 +11,7 @@ id3reader==1.53.20070415
 joblib==0.11
 kombu==4.0.2
 multidict==2.1.4
-numpy==1.12.1
+numpy==1.21.0
 olefile==0.44
 Pillow==6.2.0
 pkg-resources==0.0.0