📦 Demand Cython 3 under Python 3.12+

webknjaz · Nov 29, 2023 · 09ddbc9 · 09ddbc9
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diff --git a/docs/changelog-fragments/502.packaging.rst b/docs/changelog-fragments/502.packaging.rst
@@ -0,0 +1,6 @@
+The ``Cython`` build time dependency now has the minimum
+version of 3.0 under Python 3.12 and higher.
+-- by :user:`webknjaz`
+
+The previous versions of ``Cython`` are still able to build
+the project under older Python versions.
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,7 +1,8 @@
 [build-system]
 requires = [
  # Essentials
- "Cython", # needed by in-tree build backend `packaging/pep517_backend.py`
+ "Cython >= 3.0.0b3; python_version >= '3.12'", # needed by in-tree build backend `packaging/pep517_backend.py`
+ "Cython; python_version < '3.12'", # needed by in-tree build backend `packaging/pep517_backend.py`
  "setuptools>=45", # needed by in-tree build backend `packaging/pep517_backend.py`
  "tomli; python_version < '3.11'", # needed by in-tree build backend `packaging/pep517_backend.py`
  "expandvars", # needed by in-tree build backend for env vars interpolation