diff --git a/py_bind/pyproject.toml b/py_bind/pyproject.toml
index 4f45da8..69a1d4b 100644
--- a/py_bind/pyproject.toml
+++ b/py_bind/pyproject.toml
@@ -4,12 +4,12 @@ requires = [
     "packaging==20.5; platform_machine=='arm64'",  # macos M1
     "setuptools==59.2.0",
     "wheel==0.37.0",
-    "Cython>=0.29.28,<3.0",  # Note: keep in sync with tools/cythonize.py
+    "Cython>=0.29.36,<3.0",  # Note: keep in sync with tools/cythonize.py
     "numpy>=1.17.3, <1.24",
 ]
 
 [tool.cibuildwheel]
-before-build = "pip install numpy cython && cd py_bind && python setup.py prepare"
+before-build = "pip install numpy cython<"3" && cd py_bind && python setup.py prepare"
 test-requires = ["nose","six"]
 test-command = "cd {project}/py_bind/test && nosetests"
 skip = ["cp310-*","pp*"]