diff --git a/pyproject.toml b/pyproject.toml
index ec90642e..36219566 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "wheel", "tableauhyperapi", "numpy"]
+requires = ["setuptools", "wheel", "tableauhyperapi", "oldest-supported-numpy"]
 
 [tool.towncrier]
     package = "pantab"