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Regenerate Lock File With Newer Bundler

While upgrading to the latest Ruby version (4.0.0), I also wanted to upgrade the version of bundler that my project uses. This shows up at the bottom of the Gemfile.lock file as the BUNDLED WITH line. Despite installing the latest version of bundler, I get the following message when I try to install dependencies.

$ bundle install

Bundler 4.0.3 is running, but your lockfile was generated with 2.6.2.
Installing Bundler 2.6.2 and restarting using that version.
...

Instead, what we need to tell bundle to update the locked version of bundler in the Gemfile.lock.

$ bundle update --bundler

Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundle updated!

The --bundler flag for bundle-update says the following:

Update the locked version of bundler to the invoked bundler version.

So we could pass a specific bundler version to that flag, but in this case I want to use the version I'm invoking it with which is the latest that I just installed.