bundler.io has been wound down and its content now lives on RubyGems Guides: the Bundler man pages under /command-reference/, the Gemfile reference at /gemfile/, and the remaining guides as individual pages. The redirects still work, but linking to the real locations keeps `gem help gem_dependencies`, `bundle issue`, and the man page cross references from depending on them.
Two references stay on bundler.io. The homepage in lib/bundler/source/metadata.rb has to match the published bundler gemspec, and the team pages linked from doc/POLICIES.md have no replacement yet.
https://github.com/ruby/rubygems/commit/69aa22cd41
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>