--- packaging/pep517_backend/_backend.py.orig	2026-01-12 11:41:25
+++ packaging/pep517_backend/_backend.py	2026-01-12 11:41:53
@@ -376,7 +376,7 @@
     if is_pure_python_build:
         c_ext_build_deps = []
     else:
-        c_ext_build_deps = ['Cython ~= 3.1.0']
+        c_ext_build_deps = ['Cython']
 
     return _setuptools_get_requires_for_build_wheel(
         config_settings=config_settings,