-- pyproject.toml uses PEP 639 SPDX license string format ("BSD-3-Clause") which -- requires setuptools >= 68.x. Use the older {text = ...} format to support -- the currently installed setuptools version. --- pyproject.toml.orig 2026-04-28 08:57:30 UTC +++ pyproject.toml @@ -7,7 +7,7 @@ readme = "README.md" requires-python = ">=3.9" authors = [{name = "Scientific Python Developers"}] readme = "README.md" -license = "BSD-3-Clause" +license = {text = "BSD-3-Clause"} dynamic = ['version'] classifiers = [ "Development Status :: 5 - Production/Stable",