diff --git a/py_bind/pyproject.toml b/py_bind/pyproject.toml
index 4f45da8..f1d6ac6 100644
--- a/py_bind/pyproject.toml
+++ b/py_bind/pyproject.toml
@@ -4,7 +4,7 @@ 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",
 ]