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UV Constraint Dependencies

Shared by avatar for Martin Mahner Martin Mahner on 

  • tags:
  • #python
  • #uv

You can force transitive dependencies to resolve to specific versions without adding them to your main dependencies using constraint-dependencies in pyproject.toml:

[tool.uv]
constraint-dependencies = ["urllib3>=2"]

This is useful when a sub-dependency has a bug or security issue and you need to enforce a minimum version, but you don't actually import it directly. Before this, you'd have to pollute your [project.dependencies] with packages you don't directly use just to pin them. Constraints apply during resolution without declaring a direct dependency.