diff --git a/requirements.txt b/requirements.txt
index 7e5aa3d..96d4f57 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-numpy==1.11.1
+numpy==1.21.0
 simpy==3.0.10
 matplotlib==2.2.4
\ No newline at end of file