diff --git a/pythonBOOKS/Mastering-Matplotlib/code/01-preview/requirements/base.txt b/pythonBOOKS/Mastering-Matplotlib/code/01-preview/requirements/base.txt
index 3b205d2..0748c5c 100644
--- a/pythonBOOKS/Mastering-Matplotlib/code/01-preview/requirements/base.txt
+++ b/pythonBOOKS/Mastering-Matplotlib/code/01-preview/requirements/base.txt
@@ -2,7 +2,7 @@ six
 python-dateutil
 pyparsing
 pytz
-numpy==1.9.2
+numpy==1.21.0
 ipython[notebook]==3.1.0
 matplotlib==1.4.3
 scipy==0.15.1