rails new のバージョン指定について

前提・実現したいこと

rails newにてアプリケーションを作成した際に、バージョンを5.0.0.1に指定をしました。
しかし作成されたアプリケーションは、指定したバージョンとは異なり5.0.2となっていました。

原因が不明なので、ご回答お願い致します。

コンソール(実行結果)

~/workspace $ gem install rails --version 5.0.0.1
Fetching: i18n-0.8.1.gem (100%)
Successfully installed i18n-0.8.1
Fetching: thread_safe-0.3.6.gem (100%)
Successfully installed thread_safe-0.3.6
Fetching: tzinfo-1.2.2.gem (100%)
Successfully installed tzinfo-1.2.2
Fetching: concurrent-ruby-1.0.5.gem (100%)
Successfully installed concurrent-ruby-1.0.5
Fetching: activesupport-5.0.0.1.gem (100%)
Successfully installed activesupport-5.0.0.1
Fetching: rack-2.0.1.gem (100%)
Successfully installed rack-2.0.1
Fetching: rack-test-0.6.3.gem (100%)
Successfully installed rack-test-0.6.3
Fetching: mini_portile2-2.1.0.gem (100%)
Successfully installed mini_portile2-2.1.0
Fetching: nokogiri-1.7.1.gem (100%)
Building native extensions.  This could take a while...
Successfully installed nokogiri-1.7.1
Fetching: loofah-2.0.3.gem (100%)
Successfully installed loofah-2.0.3
Fetching: rails-html-sanitizer-1.0.3.gem (100%)
Successfully installed rails-html-sanitizer-1.0.3
Fetching: rails-dom-testing-2.0.2.gem (100%)
Successfully installed rails-dom-testing-2.0.2
Fetching: builder-3.2.3.gem (100%)
Successfully installed builder-3.2.3
Fetching: erubis-2.7.0.gem (100%)
Successfully installed erubis-2.7.0
Fetching: actionview-5.0.0.1.gem (100%)
Successfully installed actionview-5.0.0.1
Fetching: actionpack-5.0.0.1.gem (100%)
Successfully installed actionpack-5.0.0.1
Fetching: activemodel-5.0.0.1.gem (100%)
Successfully installed activemodel-5.0.0.1
Fetching: arel-7.1.4.gem (100%)
Successfully installed arel-7.1.4
Fetching: activerecord-5.0.0.1.gem (100%)
Successfully installed activerecord-5.0.0.1
Fetching: globalid-0.3.7.gem (100%)
Successfully installed globalid-0.3.7
Fetching: activejob-5.0.0.1.gem (100%)
Successfully installed activejob-5.0.0.1
Fetching: mime-types-data-3.2016.0521.gem (100%)
Successfully installed mime-types-data-3.2016.0521
Fetching: mime-types-3.1.gem (100%)
Successfully installed mime-types-3.1
Fetching: mail-2.6.4.gem (100%)
Successfully installed mail-2.6.4
Fetching: actionmailer-5.0.0.1.gem (100%)
Successfully installed actionmailer-5.0.0.1
Fetching: nio4r-1.2.1.gem (100%)
Building native extensions.  This could take a while...
Successfully installed nio4r-1.2.1
Fetching: websocket-extensions-0.1.2.gem (100%)
Successfully installed websocket-extensions-0.1.2
Fetching: websocket-driver-0.6.5.gem (100%)
Building native extensions.  This could take a while...
Successfully installed websocket-driver-0.6.5
Fetching: actioncable-5.0.0.1.gem (100%)
Successfully installed actioncable-5.0.0.1
Fetching: thor-0.19.4.gem (100%)
Successfully installed thor-0.19.4
Fetching: method_source-0.8.2.gem (100%)
Successfully installed method_source-0.8.2
Fetching: railties-5.0.0.1.gem (100%)
Successfully installed railties-5.0.0.1
Fetching: bundler-1.14.6.gem (100%)
Successfully installed bundler-1.14.6
Fetching: sprockets-3.7.1.gem (100%)
Successfully installed sprockets-3.7.1
Fetching: sprockets-rails-3.2.0.gem (100%)
Successfully installed sprockets-rails-3.2.0
Fetching: rails-5.0.0.1.gem (100%)
Successfully installed rails-5.0.0.1
36 gems installed

~/workspace $ rails --version
Rails 5.0.0.1

~/workspace $ rails _5.0.0.1_ new hello_app
      create  
      create  README.md
      create  Rakefile
      create  config.ru
      create  .gitignore
      create  Gemfile
      ・
      ・省略
      ・
      create  vendor/assets/javascripts
      create  vendor/assets/javascripts/.keep
      create  vendor/assets/stylesheets
      create  vendor/assets/stylesheets/.keep
      remove  config/initializers/cors.rb
         run  bundle install
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Installing rake 12.0.0
Using concurrent-ruby 1.0.5
Using i18n 0.8.1
Installing minitest 5.10.1
Using thread_safe 0.3.6
Using builder 3.2.3
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using rack 2.0.1
Installing nio4r 2.0.0 with native extensions
Using websocket-extensions 0.1.2
Using mime-types-data 3.2016.0521
Using arel 7.1.4
Using bundler 1.14.6
Installing byebug 9.0.6 with native extensions
Installing coffee-script-source 1.12.2
Installing execjs 2.7.0
Using method_source 0.8.2
Using thor 0.19.4
Installing debug_inspector 0.0.2 with native extensions
Installing ffi 1.9.18 with native extensions
Installing multi_json 1.12.1
Installing rb-fsevent 0.9.8
Installing puma 3.8.2 with native extensions
Installing sass 3.4.23
Installing tilt 2.0.7
Installing sqlite3 1.3.13 with native extensions
Installing turbolinks-source 5.0.0
Using tzinfo 1.2.2
Using nokogiri 1.7.1
Using rack-test 0.6.3
Using sprockets 3.7.1
Using websocket-driver 0.6.5
Using mime-types 3.1
Installing coffee-script 2.4.1
Installing uglifier 3.1.9
Installing rb-inotify 0.9.8
Installing turbolinks 5.0.1
Installing activesupport 5.0.2
Using loofah 2.0.3
Using mail 2.6.4
Installing listen 3.0.8
Using rails-dom-testing 2.0.2
Using globalid 0.3.7
Installing activemodel 5.0.2
Installing jbuilder 2.6.3
Installing spring 2.0.1
Using rails-html-sanitizer 1.0.3
Installing activejob 5.0.2
Installing activerecord 5.0.2
Installing spring-watcher-listen 2.0.1
Installing actionview 5.0.2
Installing actionpack 5.0.2
Installing actioncable 5.0.2
Installing actionmailer 5.0.2
Installing railties 5.0.2
Using sprockets-rails 3.2.0
Installing coffee-rails 4.2.1
Installing jquery-rails 4.2.2
Installing web-console 3.4.0
Installing rails 5.0.2
Installing sass-rails 5.0.6
Bundle complete! 15 Gemfile dependencies, 62 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.
         run  bundle exec spring binstub --all
* bin/rake: spring inserted
* bin/rails: spring inserted

~/workspace $ rails --version
Rails 5.0.2

~/workspace/hello_app $ rails --version
Rails 5.0.2

Gemfile

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
# Use sqlite3 as the database for Active Record
gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console'
  gem 'listen', '~> 3.0.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

備考

開発環境はcloud9です。