Has Heroku's Ruby Buildpack upgraded Bundler yet?

This is a example Rust web application that tells you if the latest released Ruby buildpack for Heroku comes with a certain version of Bundler.

Benchmarks

Legal

This application is copyrighted under the GNU Affero General Public License (GNU AGPL), version 3.0.

I do not own the copyright and/or trademark for the following assets:

• Yes/no emojis from Emoji One (2.x), using the Creative Commons
  Attribution 4.0 International license.
• GitHub icon from Octicons, using the SIL Open Font
  License 1.1.
• Fira Sans font, using the SIL Open Font License 1.1.
• Normalize.css, using the MIT license.
• Typeplate, using the Creative Commons Attribution
  3.0 Unported license.
• The Heroku, Ruby, Rust, or Bundler names.