Gem::BundlerVersionFinder.bundler_version

# File tmp/rubies/ruby-4.0.0/lib/rubygems/bundler_version_finder.rb, line 4
def self.bundler_version
  return if bundle_config_version == "system"

  v = ENV["BUNDLER_VERSION"]
  v = nil if v&.empty?

  v ||= bundle_update_bundler_version
  return if v == true

  v ||= lockfile_version
  return unless v

  Gem::Version.new(v)
end