Heroku Ruby版本不会升级吗？

我正在努力在Heroku上更改Ruby版本。我将Ruby 2.0.0与rails 4一起使用。

我的Gemfile有：

source 'https://rubygems.org'
ruby '2.0.0'
...

Heroku中的路径指向：

$ heroku config -s | grep PATH
PATH=bin:vendor/bundle/ruby/1.9.1/bin:/usr/local/bin:/usr/bin:/bin

当我推送应用程序时，我可以看到：

Fetching repository, done.
Counting objects: 7, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 431 bytes | 0 bytes/s, done.
Total 4 (delta 3), reused 0 (delta 0)

-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.0.0
-----> Installing dependencies using Bundler version 1.3.2
       Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin --deployment 
       Using rake (10.1.1) 
       Using i18n (0.6.9)
       Using minitest (4.7.5)
       Using multi_json (1.8.2)
       Using atomic (1.1.14)
       Using thread_safe (0.1.3)
       Using tzinfo (0.3.38)
       Using activesupport (4.0.0.rc1)
       Using builder (3.1.4)
       Using erubis (2.7.0)
       Using rack (1.5.2)
       Using rack-test (0.6.2)
       Using actionpack (4.0.0.rc1)
       Using mime-types (1.25.1)
       Using polyglot (0.3.3)
       Using treetop (1.4.15)
       Using mail (2.5.4)
       Using actionmailer (4.0.0.rc1)
       Using activemodel (4.0.0.rc1)
       Using activerecord-deprecated_finders (1.0.3)
       Using arel (4.0.1)
       Using activerecord (4.0.0.rc1)
       Using addressable (2.3.5)
       Using bcrypt-ruby (3.1.2)
       Using coffee-script-source (1.6.3)
       Using execjs (2.0.2)
       Using coffee-script (2.2.0)
       Using thor (0.18.1)
       Using railties (4.0.0.rc1)
       Using coffee-rails (4.0.0)
       Using orm_adapter (0.5.0)
       Using warden (1.2.3)
       Using devise (3.0.4)
       Using excon (0.25.3)
       Using geocoder (1.1.9)
       Using gmapsjs (0.2.30.1)
       Using heroku-api (0.3.15)
       Using launchy (2.4.2)
       Using netrc (0.7.7)
       Using rest-client (1.6.7)
       Using rubyzip (1.1.0)
       Using heroku (3.2.1)
       Using hike (1.2.3)
       Using jbuilder (1.0.2)
       Using jquery-rails (3.0.4)
       Using jquery-ui-rails (4.1.1)
       Using json (1.8.1)
       Using libv8 (3.16.14.3)
       Using nifty-generators (0.4.6)
       Using pg (0.17.1)
       Using bundler (1.3.2)
       Using tilt (1.4.1)
       Using sprockets (2.10.1)
       Using sprockets-rails (2.0.1)
       Using rails (4.0.0.rc1)
       Using rails_serve_static_assets (0.0.2)
       Using rails_stdout_logging (0.0.3)
       Using rails_12factor (0.0.2)
       Using rdoc (3.12.2)
       Using ref (1.0.5)
       Using sass (3.2.13)
       Using sass-rails (4.0.0)
       Using sdoc (0.3.20)
       Using therubyracer (0.12.0)
       Using turbolinks (2.1.0)
       Using uglifier (2.4.0)
       Using will_paginate (3.0.5)
       Your bundle is complete! It was installed into ./vendor/bundle
       Bundle completed (0.46s)
       Cleaning up the bundler cache.
       Removing rails_log_stdout (01b5bcc572e3)
       Removing rails3_serve_static_assets (84910ceb4ca2)
-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       Asset precompilation completed (3.59s)
       Cleaning assets
-----> Discovering process types
       Procfile declares types -> (none)
       Default types for Ruby  -> console, rake, web, worker

-----> Compressing... done, 33.3MB
-----> Launching... done, v17
       http://rocky-shore-1207.herokuapp.com deployed to Heroku

To git@heroku.com:rocky-shore-1207.git
   05cf948..73b6cfa  master -> master

自从Heroku说以来Using Ruby version: ruby-2.0.0，它检测到了我的Ruby版本。但是，当我运行$ heroku run rake db:migrate或heroku run 'ruby -v' 返回时：

Your Ruby version is 1.9.2, but your Gemfile specified 2.0.0

如何在Heroku上将Ruby版本更改为2.0.0？

结论：我注意到我的rails应用程序具有.bash_profile文件，但是路径错误。这条路打扰了我的红宝石版本的heroku路径。

谢谢大家的帮助：）