diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..6201b7c
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+build-backend = "setuptools.build_meta:__legacy__"
+requires = ["setuptools", "numpy==1.23.0"]