### What needs to get done Allow users to pin the bundler to a specific version. ### Why it needs to get done The Ruby plugin allows specifying a version of Ruby but always grabs the latest version of the bundler. The bundler requires a minimum version of Ruby, so previously building snaps can fail to build due to an unpinned version of the bundler. Source: https://github.com/canonical/snapcraft/pull/4954#discussion_r1717253485