Worked on maintaining the stability of the cloudsmith-io/cloudsmith-cli project by addressing compatibility issues introduced by upstream changes in the Click library. Focused on Python development and testing, the work involved removing the deprecated mix_stderr parameter from the CliRunner instantiation, which resolved a TypeError and ensured that CLI tests continued to run reliably across different Click versions. This targeted bug fix reduced continuous integration failures and helped maintain consistent tooling for both developers and users. By proactively aligning the codebase with external dependency updates, the developer contributed to lowering maintenance overhead and preserving the reliability of the CLI testing ecosystem.