During February 2025, Matsu focused on enhancing error reporting for dependency conflicts in Bundler, working across the ruby/ruby and rubygems/rubygems repositories. By refining how Bundler handles cases where a gem is specified both by path and gemspec in a Gemfile, Matsu introduced clearer, source-specific error messages and added regression tests to validate these scenarios. This Ruby-based work aligned error reporting structures between repositories, improving consistency and reducing debugging time for developers. Leveraging skills in Bundler, Gem Management, and Ruby on Rails, Matsu’s contributions deepened test coverage and increased reliability in dependency resolution for teams integrating Bundler.