diff --git a/pyproject.toml b/pyproject.toml
index b886bade..0bce1e8a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["Cython>=3.0.8", "setuptools", "wheel"]
+requires = ["Cython>=3.0.9", "setuptools", "wheel"]
 
 [tool.cibuildwheel]
 build-verbosity = 2
diff --git a/requirements.txt b/requirements.txt
index 72b879e6..ccd1a688 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-Cython>=3.0.8
+Cython>=3.0.9
 setuptools