diff --git a/requirements.txt b/requirements.txt
index 2917193..4b6c860 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 scipy==0.17.1
 pandas==0.18.1
-numpy==1.11.1
+numpy==1.21.0
 PuLP==1.6.1