diff --git a/requirements.txt b/requirements.txt
index b317921..8e07110 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy==1.11.0
+numpy==1.21.0
 scipy==0.17.1
 multiprocessing>=2.6.0-0.1
 matplotlib==1.5.1