Generating the Gemfile.next.lock
We recommend using the Dual Boot technique for upgrades. This requires us to generate a Gemfile.next.lock file that will be used to boot the app with the next version or Rails. In this article we’ll share 2 techniques to generate this file: the faster one and the safer one.
https://www.fastruby.io/blog/ruby/dual-boot/generating-gemfile-next-lock.html
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