diff --git a/requirements.txt b/requirements.txt
index 044abb4..a938281 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ nbconvert==4.2.0
 nbformat==4.0.1
 networkx==1.11
 notebook==4.2.1
-numpy==1.11.0
+numpy==1.21.0
 optpy==0.0.1
 pathlib2==2.1.0
 pexpect==4.1.0