uv lock --refresh crashes on local uv sources with mixed python versions #18199
Description
Summary
If the root repository has requires-python = ">=3.10", but its child has requires-python = ">=3.12", uv lock --refresh crashes on 3.10 but works on 3.14.
This use case is mentioned in the docs at the bottom here (before the note block)
# pyproject.toml
[project]
name = "hello-world"
version = "0.1.0"
requires-python = ">=3.10"
dependencies = [
"docs; python_version >= '3.12'"
]
[tool.uv.sources]
docs = { path = "docs" }
[build-system]
requires = ["uv_build>=0.10.4,<0.11.0"]
build-backend = "uv_build"# docs/pyproject.toml
[project]
name = "docs"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = ["Sphinx~=9.1.0"]
[build-system]
requires = ["uv_build>=0.10.4,<0.11.0"]
build-backend = "uv_build"> echo 3.10 > .python-version
> uv lock --refresh
× No solution found when resolving dependencies for split (markers: python_full_version >= '3.12'):
╰─▶ Because only docs{python_full_version >= '3.12'}==0.1.0 is available and the current Python version (3.10.19) does not satisfy Python>=3.12, we can conclude that all versions of
docs{python_full_version >= '3.12'} cannot be used.
And because your project depends on docs{python_full_version >= '3.12'}, we can conclude that your project's requirements are unsatisfiable.
hint: While the active Python version is 3.10, the resolution failed for other Python versions supported by your project. Consider limiting your project's supported Python versions
using `requires-python`.
> echo 3.14 > .python-version
> uv lock --refresh
Using CPython 3.14.2
Resolved 25 packages in 80msIf you replace docs; python_version >= '3.12' with Sphinx~=9.1.0; python_version >= '3.12', everything works as expected
This was also reproduced in GitHub actions on Linux, MacOS, and Windows
https://github.com/py-mine/mcstatus/actions/runs/22424511522?pr=1118
Platform
Linux 6.18.9-zen1 x86_64 GNU/Linux (NixOS)
Version
uv 0.10.6
Python version
3.10.19 and 3.14.2