As of Bundler v2.3 (when using RubyGems v3.3+), Bundler will automatically use the BUNDLED WITH
version specified in Gemfile.lock
when running the bundle install
command. If the specified version of Bundler is not available, it will be downloaded and installed.
$ bundler -v
Bundler version 2.3.15
$ tail -2 ./example/Gemfile.lock
BUNDLED WITH
2.1.4
$ (cd ./example && bundler -v)
Bundler version 2.1.4
If you can't upgrade to v2.3, there is a workaround. You will have to install the correct version of Bundler manually, but then you can use the _version_
syntax.
$ bundler _2.1.4_ -v
Bundler version 2.1.4
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