Hi, I have a transitive dependency that can’t be solved (found one incompatible version) although I can’t see any other package requires it in the lock file… you have any suggestions why this could happen and how to solve it?

Sorry for the trouble! It'll be hard for us to help you without more info. Can you share the error message? Even better would be a reduced example, but we can start with the errror.

Failed to resolve compatible artifacts from requirements.lock for 1 target: 1. /usr/bin/python3.8 failed to resolve all requirements for … Configured with: Build: True use_wheel: True Dependency on starlette not satisfied, 1 incompatible candidate found: 1.) starlette 0.43 does not satisfy the following requirements: <0.42.0, >=0.40.0 (via: fastapi-> starlette<0.42.0, >=0.40.0 )

I don't know. Pants is using the https://github.com/pex-tool/pex tool to create lockfiles, which in turn uses pip, so I suggest working outside of pants with those tools directly and then, once you have a working solution, we can translate that back to pants. https://www.pantsbuild.org/prerelease/docs/using-pants/troubleshooting-common-issues#debug-tip-inspect-the-sandbox-with---keep-sandboxes gives you access to the underlying command pants is invoking, to start reducing/editing.