Rails 2.2 has just released. You can read the new features of this release in Rails weblog. Some highlights for the new release which are mentioned in Rails weblog are:

• Internationalization by default
• Stronger etag and last-modified support
• Thread safety and a connection pool
• Ruby 1.9 and JRuby compatibility
• Better API docs, great guides

Installation

Rails 2.2 requires the latest RubGems version which is 1.3.1. If you haven’t upgraded yet, you can do it with the following command:

sudo gem update --system

After updating RubyGems, you are ready to install the new shiny Rails 2.2

sudo gem install rails

Further readings

• Rails 2.2 Released: A Glance at New Features
• Rails 2.2: i18n, HTTP validators, thread safety, JRuby/1.9 compatibility, docs
• Rails 2.2 Released – 27 Links and Resources To Get You Going