diff --git a/requirements.txt b/requirements.txt
index 3cf8682..adc497d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 pyutilib==5.8.0
 jdcal==1.4
 Pyomo==5.5.1
-numpy==1.15.4
+numpy==1.22.0
 matplotlib==3.0.2
 scipy==1.1.0
 ipdb==0.11