--- pyproject.toml	2024-11-19 08:23:30.000000000 +0800
+++ pyproject.toml	2025-09-30 10:09:33.000000000 +0800
@@ -48,7 +48,7 @@
             "setuptools_scm",
             "extension-helpers==1.*",
             "numpy>=2.0.0rc1",
-            "cython>=3.0,<3.1"]
+            "cython>=3.0"]
 build-backend = 'setuptools.build_meta'
 
 [tool.setuptools]