bundle clean
  bundle-clean - Cleans up unused gems in your bundler directory
bundle clean [--dry-run] [--force]
Description
This command will remove all unused gems in your bundler directory. This is
useful when you have made many changes to your gem dependencies.
Options
--dry-run 
- Print the changes, but do not clean the unused gems.
 
--force 
- Forces cleaning up unused gems even if Bundler is configured to use globally installed gems. As a consequence, removes all system gems except for the ones in the current application.