diff --git a/requirements.txt b/requirements.txt
index b00c924..70e8498 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ decorator==4.3.0
 kiwisolver==1.0.1
 matplotlib==2.2.3
 networkx==2.1
-numpy==1.15.1
+numpy==1.22.0
 ortools==6.7.4973
 pandas==0.23.4
 protobuf==3.6.1