bundler/bundler — pull request #3025 by andyw8 (2014-05-10 14:08:31+00:00)
Title: Improve advice on updating a single gem

The current advice is misleading. To resolve a lock issue, It's usually only necessary to update a single gem, rather than that gem and all of its dependencies.

http://ilikestuffblog.com/2012/07/01/you-should-update-one-gem-at-a-time-with-bundler-heres-how/