何故か再現しないnorikraとfluent-plugin-norikraの依存rack不一致

Gemfile

source "https://rubygems.org"


platforms :ruby do
  gem "fluentd"
  gem "fluent-plugin-norikra"
  gem "fluent-plugin-dummydata-producer"
end

platforms :jruby do
  gem "norikra"
end

log

harukasan bundle install                                                                             [~/hello-norikra]
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "rack":
  In Gemfile:
    fluent-plugin-norikra (>= 0) ruby depends on
      rack (~> 1.4.1) ruby

    norikra (>= 0) java depends on
      rack (1.5.2)