diff --git a/requirements.txt b/requirements.txt
index ccda763..6650575 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy==1.9.1
+numpy==1.22.0
 scipy==0.15.1
 matplotlib==1.4.3
 basemap==1.0.7