ruby-on-rails – 现有Heroku应用程序上的Ruby 2.1.0

!     Invalid RUBY_VERSION specified: ruby-2.1.0
 !     Valid versions: ruby-2.0.0,ruby-1.9.3,ruby-1.9.2,ruby-1.8.7,ruby-1.9.3-jruby-1.7.0,ruby-1.8.7-jruby-1.7.0,ruby-1.9.3-jruby-1.7.1,ruby-1.8.7-jruby-1.7.1,ruby-1.9.3-rbx-2.0.0dev,ruby-1.8.7-rbx-2.0.0dev

在部署到Heroku的新Rails应用程序上,新的Ruby版本没有问题.

我的Gemfile：

source 'https://rubygems.org'

ruby '2.1.0'

gem 'rails','~> 3.2.14'
gem 'pg'
gem 'unicorn'
gem 'pry'

gem 'active_model_serializers'
gem 'activeadmin'
gem 'activerecord-postgres-hstore'
gem 'acts-as-taggable-on',git: 'git://github.com/mbleigh/acts-as-taggable-on.git'
gem 'addressable','~> 2.3.2',require: 'addressable/uri'
gem 'airbrake'
gem 'alchemy-api-rb',:require => ['alchemy_api','excon']
gem 'bcrypt-ruby','~> 3.0.1'
gem 'browser'
gem 'cancan'
gem 'ckeditor','= 4.0.2'
gem 'dalli'
gem 'filepicker-rails',git: 'https://github.com/limonka/filepicker-rails.git'
gem 'geocoder'
gem 'google_places'
gem 'google_places_autocomplete'
gem 'haml','~> 3.1.6'
gem 'haml-rails','~> 0.3.4'
gem 'heroku-api'
gem 'kaminari'
gem 'koala','= 1.5.0'
gem 'memcachier'
gem 'metainspector','~> 1.15.3'
gem 'newrelic_rpm'
gem 'jbuilder','1.2.0'
gem 'paper_trail'
gem 'paperclip'
gem 'pusher'
gem 'rack-cache',require: 'rack/cache'
gem 'rack-mini-profiler'
gem 'recaptcha',require: 'recaptcha/rails'
gem 'rest-client'
# FIXME: Make sure that the bug with sidekiq-failures has been fixed: https://github.com/mhfs/sidekiq-failures/pull/49
gem 'sidekiq','= 2.15.2'
gem 'sidekiq-failures'
gem 'simple_form','~> 2.0.1'
gem 'sinatra','~> 1.3.0',require: false
gem 'slim','~> 1.3.8'
gem 'sorcery'
gem 'sunspot_rails','= 2.0.0'
gem 'sunspot_solr','= 2.0.0'
gem 'state_machine'
gem 'uglifier','~> 1.2.3'
gem 'yajl-ruby'
gem 'rack-cors',require: 'rack/cors'
gem 'rubyzip','~> 0.9.9'
gem 'paper_trail'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'asset_sync'
  gem 'fog','~> 1.11.1'
  gem 'compass','= 0.12.2'
  gem 'compass-rails','~> 1.0.1'
  gem 'compass_twitter_bootstrap',git: 'https://github.com/vwall/compass-twitter-bootstrap.git',ref: '1a7b5ce5'
  gem 'coffee-rails','~> 3.2.1'
  gem 'handlebars_assets','~> 0.6.6'
  gem 'jquery-rails','~> 2.1.4'
  gem 'sass-rails'
  gem 'coffee-script-source','~> 1.6.2'
  gem 'turbo-sprockets-rails3'
end

group :test,:development do
  gem 'capybara'
  gem 'database_cleaner','~> 0.7.2'
  gem 'factory_girl'
  gem 'faker'
  gem 'jasminerice',git: 'git://github.com/bradphelan/jasminerice.git'
  gem 'minitest','~> 4.0'
  gem 'launchy'
  gem 'localtunnel'
  gem 'pusher-fake','= 0.9.0'
  gem 'ruby-prof'
  gem 'selenium-webdriver','~> 2.34.0'
  gem 'webmock','~> 1.10.2',require: false
  gem 'mocha',require: false
end

group :development do
  gem 'bullet'
  gem 'foreman'
  gem 'growl'
  gem 'hirb'
  gem "letter_opener"
  gem 'mailcatcher'
  gem 'powder'
  gem 'thin'
  gem 'wirble'
  gem 'yaml_db'
end

有任何想法吗？