diff --git a/Formula/py-ard.rb b/Formula/py-ard.rb
index cde559f..c29a2fe 100644
--- a/Formula/py-ard.rb
+++ b/Formula/py-ard.rb
@@ -8,6 +8,7 @@ class PyArd < Formula
   license "LGPL-3.0"
 
   depends_on "python@3.11"
+  depends_on "numpy"
 
   resource "pandas" do
     url "https://files.pythonhosted.org/packages/88/d9/ecf715f34c73ccb1d8ceb82fc01cd1028a65a5f6dbc57bfa6ea155119058/pandas-2.2.2.tar.gz"