diff --git a/pyproject.toml b/pyproject.toml
index ede7a018..03753a93 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ['setuptools', 'numpy', 'Cython<3.0.0']
+requires = ['setuptools', 'numpy<2.0.0', 'Cython<3.0.0']
 build-backend = 'setuptools.build_meta'
 
 [project]