diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..c07b1d3
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "Cython"]
+build-backend = "setuptools.build_meta"
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index f71bba2..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-Cython>=0.24
diff --git a/setup.py b/setup.py
index 6a3e0af..9dcdb0e 100755
--- a/setup.py
+++ b/setup.py
@@ -137,6 +137,5 @@ def find_version():
         "Programming Language :: Python :: 3.9",
     ],
     ext_modules=cythonize(modules, language_level=3),
-    setup_requires=["Cython<3"],
     install_requires=["setuptools>=19.0"],
 )