"More recent Ruby version" shows up even when using jruby

[schneems]

     #   +remote: -----> Using Ruby version: ruby-2.5.7-jruby-9.2.13.0
     #   +remote: -----> Installing dependencies using bundler 1.17.3
     #   +remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 BUNDLE_GLOBAL_PATH_APPENDS_RUBY_SCOPE=1 bundle install -j4
     #   +remote:        Fetching gem metadata from https://rubygems.org/..
     #   +remote:        Fetching rake 13.0.1
     #   +remote:        Installing rake 13.0.1
     #   +remote:        Using bundler 1.17.3
     #   +remote:        Fetching rack 2.2.2
     #   +remote:        Installing rack 2.2.2
     #   +remote:        Bundle complete! 2 Gemfile dependencies, 3 gems now installed.
     #   +remote:        Gems in the groups development and test were not installed.
     #   +remote:        Bundled gems are installed into `./vendor/bundle`
     #   +remote:        Bundle completed (17.04s)
     #   +remote:        Cleaning up the bundler cache.
     #   +remote: -----> Writing config/database.yml to read from DATABASE_URL
     #   +remote: -----> Detecting rake tasks
     #   +remote: -----> Precompiling assets
     #   +remote:        Running: rake assets:precompile
     #   +remote:        JRUBY_OPTS is: -Xcompile.invokedynamic=false
     #   +remote:        Asset precompilation completed (5.35s)
     #   +remote:
     #   +remote: ###### WARNING:
     #   +remote:
     #   +remote:        There is a more recent Ruby version available for you to use:
     #   +remote:
     #   +remote:
     #   +remote:
     #   +remote:        The latest version will include security and bug fixes. We always recommend
     #   +remote:        running the latest version of your minor release.
     #   +remote:
     #   +remote:        Please upgrade your Ruby version.
     #   +remote:
     #   +remote:        For all available Ruby versions see:
     #   +remote:          https://devcenter.heroku.com/articles/ruby-support#supported-runtimes

Gemfile.lock:

GEM
  remote: https://rubygems.org/
  specs:
    rack (2.2.2)
    rake (13.0.1)

PLATFORMS
  java

DEPENDENCIES
  rack
  rake


RUBY VERSION
   ruby 2.5.7p0 (jruby 9.2.13.0)

[schneems]

I think there are multiple jruby version suggestion bugs #1370