diff --git a/pyproject.toml b/pyproject.toml
index 64aaabd7..8eae2c1f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "wheel", "cython", "numpy"]
+requires = ["setuptools", "wheel", "cython==3.0.12", "numpy"]
 build-backend = "setuptools.build_meta"
 
 [project]