diff --git a/setup.py b/setup.py
index 6df6128..b39f26e 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
     Extension('jsonobject.utils', ["jsonobject/utils" + ext],),
 ]
 
-CYTHON_REQUIRES = ['cython>=0.29.21,<1.0.0']
+CYTHON_REQUIRES = ['cython>=3.0.0,<4.0.0']
 if USE_CYTHON:
     from Cython.Build import cythonize
     extensions = cythonize(extensions)