diff --git a/Chapter04/requirements.txt b/Chapter04/requirements.txt
index 65192a6..b78eb67 100644
--- a/Chapter04/requirements.txt
+++ b/Chapter04/requirements.txt
@@ -1,7 +1,7 @@
 azureml-sdk==1.3.0
 azureml-dataprep==1.4.3
 pandas==0.23.4
-numpy==1.16.2
+numpy==1.22.0
 scikit-learn==0.20.3
 pyspark==2.4.3
 pyarrow==0.17.0
\ No newline at end of file