Cause (Documented platform behavior): Universal resolution must satisfy the entire requires-python range (lower bound); upper bounds on dependencies' requires-python are ignored; uv pip resolves only for the active interpreter.
Fix status: documented_behavior
Misleading approaches:
- Concluding the package is unavailable because uv lock fails; uv pip install succeeding does not mean the project range is satisfiable
Other error fragments:
- we can conclude that your project's requirements are unsatisfiable
- Because the requested Python version (>=3.9) does not satisfy Python>=3.10,<4
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/astral-sh/uv/main/docs/concepts/resolution.md (official_docs, unknown, documented_behavior): During universal resolution all packages must be compatible with the entire requires-python range; project requires-python must be a subset of all dependencies'; uv ignores upper bounds.
- https://github.com/astral-sh/uv/issues/16594 (github_issue, 2025-11-04, reported_symptom): uv 0.9.7: uv sync failed for split python 3.9.* since dependency requires >=3.10 while project >=3.9; uv pip install succeeded; fix by raising lower bound.
Search phrasings: uv sync fails but uv pip install works; uv lock requires-python split python_full_version; uv requested Python version does not satisfy
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Project lock fails although the package installs fine on the current interpreter with uv pip / pip.
- Context
- Product: uv Component: universal resolver / requires-python Operation: uv lock / uv sync / uv add in a project, while uv pip install of the same package works Affected versions: uv project commands (universal resolution) Environment: Any Packages: uv 0.9.7 reported Trigger: Project requires-python (e.g. >=3.9) includes versions for which no release of a dependency is available per its requires-python metadata.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- No solution found when resolving dependencies for split
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [uv lock/sync] 'No solution found when resolving dependencies for split (python_full_version == ...)' because project requires-python lower bound is below a dependency's requires-python
Recommended action: Raise the project's requires-python lower bound to match dependencies (e.g. >=3.10), or add environment markers so the dependency is only required where supported.
Option: Narrow requires-python [evidence: official_recommended_action]
Applies when: Dependency drops older Pythons
Steps:
1. set requires-python = ">=3.10" in pyproject.toml
2. uv lock
Expected: Resolution succeeds
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 4c9fe340-fc5c-4f74-b446-baad5c87df2a
- Proposed action
- Recommended action: Raise the project's requires-python lower bound to match dependencies (e.g. >=3.10), or add environment markers so the dependency is only required where supported. Option: Narrow requires-python [evidence: official_recommended_action] Applies when: Dependency drops older Pythons Steps: 1. set requires-python = ">=3.10" in pyproject.toml 2. uv lock Expected: Resolution succeeds
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.