From 015ad12ec0f65a9b3db2a5f713b92a6aa104b8b5 Mon Sep 17 00:00:00 2001
From: Nic Crane <thisisnic@gmail.com>
Date: Thu, 21 Aug 2025 17:27:42 +0100
Subject: [PATCH] Upgrade required Cython to 3.1

---
 .github/workflows/dev.yml           | 2 +-
 ci/conda_env_python.txt             | 2 +-
 python/pyproject.toml               | 2 +-
 python/requirements-build.txt       | 2 +-
 python/requirements-wheel-build.txt | 2 +-
 python/setup.py                     | 4 ++--
 6 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/dev.yml b/.github/workflows/dev.yml
index 0627e4e29155..51662e15008d 100644
--- a/.github/workflows/dev.yml
+++ b/.github/workflows/dev.yml
@@ -105,7 +105,7 @@ jobs:
         shell: bash
         run: |
           gem install test-unit
-          pip install "cython>=3" setuptools pytest requests setuptools-scm
+          pip install "cython>=3.1" setuptools pytest requests setuptools-scm
       - name: Run Release Test
         shell: bash
         run: |
diff --git a/ci/conda_env_python.txt b/ci/conda_env_python.txt
index 9a48f26b79c6..4e3fd9f2de71 100644
--- a/ci/conda_env_python.txt
+++ b/ci/conda_env_python.txt
@@ -20,7 +20,7 @@
 # Not a direct dependency of s3fs, but needed for our s3fs fixture
 boto3
 cffi
-cython>=3
+cython>=3.1
 cloudpickle
 fsspec
 hypothesis
diff --git a/python/pyproject.toml b/python/pyproject.toml
index 0bc8db8c7914..781e2e50284a 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -17,7 +17,7 @@
 
 [build-system]
 requires = [
-    "cython >= 3",
+    "cython >= 3.1",
     # Starting with NumPy 1.25, NumPy is (by default) as far back compatible
     # as oldest-support-numpy was (customizable with a NPY_TARGET_VERSION
     # define).  For older Python versions (where NumPy 1.25 is not yet available)
diff --git a/python/requirements-build.txt b/python/requirements-build.txt
index 00b523ee5212..088aaac86b77 100644
--- a/python/requirements-build.txt
+++ b/python/requirements-build.txt
@@ -1,4 +1,4 @@
-cython>=3
+cython>=3.1
 oldest-supported-numpy>=0.14; python_version<'3.9'
 numpy>=1.25; python_version>='3.9'
 setuptools_scm>=8
diff --git a/python/requirements-wheel-build.txt b/python/requirements-wheel-build.txt
index 38e59ce45ab8..334d285b855e 100644
--- a/python/requirements-wheel-build.txt
+++ b/python/requirements-wheel-build.txt
@@ -1,4 +1,4 @@
-cython>=3
+cython>=3.1
 oldest-supported-numpy>=0.14; python_version<'3.9'
 numpy>=2.0.0; python_version>='3.9'
 setuptools_scm
diff --git a/python/setup.py b/python/setup.py
index 88119e2d2aad..b6fea83eb03e 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -48,9 +48,9 @@
 )
 
 
-if Cython.__version__ < '3':
+if Cython.__version__ < '3.1':
     raise Exception(
-        'Please update your Cython version. Supported Cython >= 3')
+        'Please update your Cython version. Supported Cython >= 3.1')
 
 setup_dir = os.path.abspath(os.path.dirname(__file__))