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You might have noticed one change introduced with Bundler 2.3 - it now requires you to run the version of Bundler that’s specified in your Gemfile.lock.1 This means that occasionally you might see something like this:

$ bundle
Bundler 2.4.6 is running, but your lockfile was generated with 1.17.2. Installing Bundler 1.17.2 and restarting using that version.
Fetching gem metadata from https://rubygems.org/.
Fetching bundler 1.17.2
Installing bundler 1.17.2

Bundler does the safe thing automatically, but you can easily update the required Bundler version like this:

$ bundle update --bundler

Pretty meta, right?

I needed to do this out earlier today, when I noticed that Bundler 1.x is not compatible with Ruby 3. It took me a few minutes to recall the right way to update the required version of Bundler, so I thought to write this short article for posterity’s sake.

That’s all I have for you today. Keep hacking!