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<h1>Ruby on Rails Version History</h1>
<h4>by Daniel Kehoe</h4>
<p><em>Last updated 9 November 2016</em></p>
<p>A history of Ruby on Rails versions with summaries and advice.</p>
<h4>If You Are New to Rails</h4>
<p>If you’re new to Rails, see <a href="http://railsapps.github.io/what-is-ruby-rails.html">What is Ruby on Rails?</a>, the book <a href="http://learn-rails.com/learn-ruby-on-rails.html">Learn Ruby on Rails</a>, and recommendations for a <a href="https://tutorials.railsapps.org/rails-tutorial">Rails tutorial</a>.</p>
<h4>From the RailsApps Project</h4>
<p>This is an article from the RailsApps project. The <a href="http://railsapps.github.io/">RailsApps project</a> provides open source applications and detailed tutorials for Rails developers.</p>
<p>For Rails installation instructions or upgrade advice, see the articles:</p>
<ul>
<li><a href="http://railsapps.github.io/installing-rails.html">Installing Rails</a></li>
<li><a href="http://railsapps.github.io/updating-rails.html">Updating Rails</a></li>
</ul>
<h2>Stay Informed</h2>
<p>The <a href="http://railsdiff.org/">railsdiff.org</a> site shows differences between versions of the Rails default application.</p>
<p>These two weekly email newsletters will keep you informed about new Rails releases:</p>
<ul>
<li><a href="http://rubyweekly.com/">Ruby Weekly</a></li>
<li><a href="http://greenruby.org/">Green Ruby News</a></li>
</ul>
<p>Another weekly email newsletter is more technical, and focused on code arriving in the next version of Rails:</p>
<ul>
<li><a href="http://rails-weekly.goodbits.io/">This Week in Rails</a></li>
</ul>
<p>You also can follow <a href="http://twitter.com/rails_apps">@rails_apps</a> on Twitter for news.</p>
<h2>Rails 5.0</h2>
<p>Rails 5.0.0 was released June 30, 2016.</p>
<p>Notable additions in Rails 5.0 include an option for an <span class="caps">API</span>-only application suitable for use as a backend to JavaScript or mobile applications. Also <a href="https://github.com/rails/rails/tree/master/actioncable">Action Cable</a> for live features such as chat and notifications.</p>
<p>Learn more about Rails 5.0:</p>
<ul>
<li><a href="http://weblog.rubyonrails.org/2015/12/18/Rails-5-0-beta1/">Rails 5.0.0.beta1: Action Cable, <span class="caps">API</span> mode, Rails command</a></li>
<li><a href="http://blog.michelada.io/whats-new-in-rails-5" title="Mario Alberto Chavez">What’s new in Rails 5?</a></li>
<li><a href="https://blog.engineyard.com/2015/a-look-at-rails-5" title="Engine Yard">A Look at Rails 5</a></li>
<li><a href="http://www.sitepoint.com/whats-new-rails-5/" title="SitePoint">What’s New in Rails 5</a></li>
</ul>
<p><em>What You Need to Know:</em> Rails 5.0 is the current stable version. Upgrade older projects to Rails 5.0 now. See the article <a href="http://railsapps.github.io/updating-rails.html">Updating to Rails 5.0</a> and <a href="https://blog.heroku.com/archives/2016/1/22/rails-5-beta-upgrade">Upgrading to Rails 5 Beta</a>.</p>
<h2>Rails 4.2</h2>
<p>Rails 4.2.0 was released December 20, 2014. Notable additions in Rails 4.2 include <a href="https://github.com/rails/rails/tree/master/activejob">Active Job</a> for queueing tasks to run separately from the user request-response cycle.</p>
<p>Learn more about Rails 4.2:</p>
<ul>
<li><a href="http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/">Rails 4.2 Release Announcement</a></li>
<li><a href="http://edgeguides.rubyonrails.org/4_2_release_notes.html">Ruby on Rails 4.2 Release Notes</a></li>
<li><a href="http://www.justinweiss.com/blog/2014/08/25/the-lesser-known-features-in-rails-4-dot-2/">Lesser-known Features in Rails 4.2</a></li>
</ul>
<p><em>What You Need to Know:</em> Rails 4.2 is the current stable version. Upgrade older projects to Rails 4.2 now.</p>
<h4>Rails 4.2 Release History</h4>
<ul>
<li>Rails 4.2.5 was released November 12, 2015. See <a href="http://weblog.rubyonrails.org/2015/11/13/Rails-4-2-5-and-4-1-14-have-been-released/">Rails 4.2.5 and 4.1.14 have been released</a>
</li>
<li>Rails 4.2.4 was released August 24, 2015. See <a href="http://weblog.rubyonrails.org/2015/8/24/Rails-4-2-4-and-4-1-13-have-been-released/">Rails 4.2.4 and 4.1.13 have been released</a>.</li>
<li>Rails 4.2.3 was released June 25, 2015. See <a href="http://weblog.rubyonrails.org/2015/6/26/Rails-4-2-3-and-4-1-12-have-been-released/">Rails 4.2.3 and 4.1.12 have been released</a>.</li>
<li>Rails 4.2.2 was released June 16, 2015. See <a href="http://weblog.rubyonrails.org/2015/6/16/Rails-3-2-22-4-1-11-and-4-2-2-have-been-released-and-more/">Rails 3.2.22, 4.1.11 and 4.2.2 have been released and more</a>.</li>
<li>Rails 4.2.1 was released March 19, 2015. See <a href="http://weblog.rubyonrails.org/2015/3/19/Rails-4-2-1-and-4-1-10-have-been-released/">Rails 4.2.1 and 4.1.10 have been released</a>.</li>
<li>Rails 4.2.0 was released December 20, 2014. See <a href="http://weblog.rubyonrails.org/2014/12/19/Rails-4-2-final/">Rails 4.2: Active Job, Asynchronous Mails, Adequate Record, Web Console, Foreign Keys</a>.</li>
<li>Rails 4.2.0.rc2 was released December 5, 2014. See <a href="http://weblog.rubyonrails.org/2014/12/5/Rails-4-2-0-rc2-has-been-released/">Rails 4.2.0.rc2 has been released</a>.</li>
<li>Rails 4.2.0.rc1 was released November 28, 2014. See <a href="http://weblog.rubyonrails.org/2014/11/28/Rails-4-2-0-rc1-has-been-released/">Rails 4.2.0.rc1 has been released</a>.</li>
<li>Rails 4.2.0.beta1 was released August 20, 2014. See <a href="http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/">Rails 4.2 Release Announcement</a>.</li>
</ul>
<h2>Rails 4.1</h2>
<p>Rails 4.1.0 was released April 8, 2014. Two release candidates were released beginning February 18, 2014. See <a href="http://weblog.rubyonrails.org/2014/4/8/Rails-4-1/">Rails 4.1.0</a> for a description.</p>
<p>Learn more about Rails 4.1:</p>
<ul>
<li><a href="http://edgeguides.rubyonrails.org/4_1_release_notes.html">Ruby on Rails 4.1 Release Notes</a></li>
<li><a href="http://coherence.io/blog/2013/12/17/whats-new-in-rails-4-1.html">What’s new in Rails 4.1</a></li>
</ul>
<p><em>What You Need to Know:</em> The biggest change in Rails 4.1 is the new <strong>config/secrets.yml</strong> file.</p>
<h4>Rails 4.1 Release History</h4>
<ul>
<li>Rails 4.1.8 was released November 16, 2014 with a security fix. See <a href="http://weblog.rubyonrails.org/2014/11/17/Rails-3-2-21-4-0-12-and-4-1-8-have-been-released/">announcement</a>
</li>
<li>Rails 4.1.7 was released October 29, 2014 with a security fix. See <a href="http://weblog.rubyonrails.org/2014/10/30/Rails_3_2_20_4_0_11_4_1_7_and_4_2_0_beta3_have_been_released/">announcement</a>
</li>
<li>Rails 4.1.6 was released September 11, 2014 with bug fixes. See <a href="http://weblog.rubyonrails.org/2014/9/12/Rails-4-1-6-and-4-0-10-has-been-released/">announcement</a>.</li>
<li>Rails 4.1.5 was released August 18, 2014 with a security fix. See <a href="http://weblog.rubyonrails.org/2014/8/18/Rails_4_0_9_and_4_1_5_have_been_released/">announcement</a>.</li>
<li>Rails 4.1.4 was released July 2, 2014 with a patch for a regression introduced in the previous release. See <a href="http://weblog.rubyonrails.org/2014/7/2/Rails_4_0_8_and_4_1_4_have_been_released/">announcement</a>.</li>
<li>Rails 4.1.3 was released July 2, 2014 with a security fix. See <a href="http://weblog.rubyonrails.org/2014/7/2/Rails_3_2_19_4_0_7_and_4_1_3_have_been_released/">announcement</a>.</li>
<li>Rails 4.1.2 was released June 26, 2014 with bug fixes. See <a href="http://weblog.rubyonrails.org/2014/6/26/Rails-4-1-2-and-4-0-6-has-been-released">announcement</a>.</li>
<li>Rails 4.1.1 was released May 6, 2014 with a security fix. See <a href="http://weblog.rubyonrails.org/2014/5/6/Rails_3_2_18_4_0_5_and_4_1_1_have_been_released/">announcement</a>.</li>
<li>Rails 4.1.0 was released April 8, 2014. See <a href="http://weblog.rubyonrails.org/2014/4/8/Rails-4-1/">Rails 4.1.0</a>.</li>
<li>Rails 4.1.0.rc2 was released March 25, 2014. See <a href="http://weblog.rubyonrails.org/2014/3/25/Rails-4-1-rc2/">Rails 4.1.0: Release candidate 2</a>.</li>
<li>Rails 4.1.0.rc1 was released February 18, 2014. See <a href="http://weblog.rubyonrails.org/2014/2/18/Rails-4-1-rc1/">Rails 4.1.0: Release candidate 1</a>.</li>
<li>Rails 4.1.0.beta2 was released February 18, 2014. See <a href="http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/">Rails 3.2.17, 4.0.3 and 4.1.0.beta2 have been released!</a>.</li>
<li>Rails 4.1.0.beta1 was released December 17, 2013. See <a href="http://weblog.rubyonrails.org/2013/12/17/Rails-4-1-beta1/">Rails 4.1.0.beta1</a>.</li>
</ul>
<h2>Rails 4.0</h2>
<p>Rails 4.0 was released June 25, 2013. Two release candidates were released beginning April 29, 2013. The <a href="http://weblog.rubyonrails.org/2013/2/25/Rails-4-0-beta1/">Rails 4.0: Beta 1 release</a> announcement offers an overview of new features.</p>
<p>You can learn more about Rails 4.0:</p>
<ul>
<li>Ebook: Andy Lindeman <a href="http://www.upgradingtorails4.com/">Upgrading to Rails 4</a>
</li>
<li>Ebook: Philip De Smedt <a href="http://upgradetorails4.com/">Upgrade to Rails 4</a>
</li>
<li>Blog post: Mario Chavez <a href="http://blog.crowdint.com/2013/03/07/upgrading-a-rails-application-to-4-0.html">Upgrading a Rails application to 4.0</a>
</li>
<li>Script: Michael de Silva <a href="https://github.com/bsodmike/upgrade_rails_3.2.12_to_4.0.0.beta1">upgrade_rails_3.2.12_to_4.0.0.beta1</a>
</li>
<li>Video: Code School <a href="http://rails4.codeschool.com/videos">Rails 4: Zombie Outlaws</a>
</li>
<li>Article: RailsGuides <a href="http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-3-2-to-rails-4-0">Upgrading from Rails 3.2 to Rails 4.0</a> (work-in-progress document)</li>
</ul>
<p><em>What You Need to Know:</em> The biggest changes are the use of <em>strong parameters</em>, which requires rewriting controller methods that process forms, and <em>Turbolinks</em>, which requires rewriting JavaScript code that depends on page loading.</p>
<h4>Rails 4.0 Release History</h4>
<ul>
<li>Rails 4.0.4 was released March 14, 2014 with bug fixes. See <a href="http://weblog.rubyonrails.org/2014/3/14/Rails-4-0-4-has-been-released/">Rails 4.0.4 has been released!</a>.</li>
<li>Rails 4.0.3 was released February 18, 2014 with security fixes. See <a href="http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/">Rails 3.2.17, 4.0.3 and 4.1.0.beta2 have been released!</a>.</li>
<li>Rails 4.0.2 was released December 3, 2013 with security fixes. See <a href="http://weblog.rubyonrails.org/2013/12/3/Rails_3_2_16_and_4_0_2_have_been_released">Rails 3.2.16 and 4.0.2 have been released!</a>.</li>
<li>Rails 4.0.1 was released November 1, 2013 with performance gains and many bug fixes. See <a href="http://weblog.rubyonrails.org/2013/11/1/Rails-4-0-1-has-been-released/">Rails 4.0.1 has been released!</a>.</li>
<li>Rails 4.0.0 was released June 25, 2013. See <a href="http://weblog.rubyonrails.org/2013/6/25/Rails-4-0-final/">Rails 4.0: Final version released!</a>.</li>
</ul>
<h2>Rails 3.2</h2>
<p>Rails 3.2 was released January 20, 2012. Improvements over Rails 3.1 include faster execution in development mode. The speed of resolving routes also improved. There are many tiny (but helpful) improvements throughout the framework. Rails 3.2 deprecates plugins so you must find Ruby gems to replace any plugins used in earlier Rails projects. You can use Ruby 1.8.7 but you should use Ruby 1.9.3 or Ruby 2.0. See the <a href="http://weblog.rubyonrails.org/2012/1/20/rails-3-2-0-faster-dev-mode-routing-explain-queries-tagged-logger-store">Rails 3.2.0 Announcement</a> and <a href="http://guides.rubyonrails.org/3_2_release_notes.html">Ruby on Rails 3.2 Release Notes</a> (with upgrade instructions). There’s a Railscast from Ryan Bates titiled <a href="http://railscasts.com/episodes/265-rails-3-1-overview">Upgrading to Rails 3.2</a>. Michael Hartl’s popular Ruby on Rails Tutorial book covers Rails 3.2 (<a href="http://ruby.railstutorial.org/ruby-on-rails-tutorial-book?version=3.2">Ruby on Rails Tutorial Version 3.2</a>). Finally, José Valim highlights his <a href="http://blog.plataformatec.com.br/2012/01/my-five-favorite-hidden-features-in-rails-3-2/">Five Favorite ‘Hidden’ features in Rails 3.2</a>.</p>
<p><em>What You Need to Know:</em> Rails 3.2.16 is far more secure than earlier versions. If an application uses an older version of Rails, you should update to Rails 3.2.16 immediately and then begin an upgrade to Rails 4.0.</p>
<h4>Rails 3.2 Release History</h4>
<ul>
<li>Rails 3.2.17 was released February 18, 2014 with security fixes. See <a href="http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/">Rails 3.2.17, 4.0.3 and 4.1.0.beta2 have been released!</a>.</li>
<li>Rails 3.2.16 was released December 3, 2013 with security fixes. See <a href="http://weblog.rubyonrails.org/2013/12/3/Rails_3_2_16_and_4_0_2_have_been_released">Rails 3.2.16 and 4.0.2 have been released!</a>.</li>
<li>Rails 3.2.15 was released October 16, 2013 with security fixes. See <a href="http://weblog.rubyonrails.org/2013/10/16/Rails-3-2-15-has-been-released/">Rails 3.2.15 has been released!</a>.</li>
<li>Rails 3.2.14 was released July 22, 2013 with many minor bug fixes. See <a href="http://weblog.rubyonrails.org/2013/7/23/Rails-3-2-14-has-been-released/">Rails 3.2.14 has been released</a>.</li>
<li>Rails 3.2.13 was released March 18, 2013 with security fixes plus patches to assure that all Rails 3.2 projects run with Ruby 2.0. See <a href="http://weblog.rubyonrails.org/2013/2/27/Rails-3-2-13-rc1-has-been-released/">Rails 3.2.13.rc1 has been released</a> and <a href="http://weblog.rubyonrails.org/2013/3/18/SEC-ANN-Rails-3-2-13-3-1-12-and-2-3-18-have-been-released/">Rails 3.2.13, 3.1.12, and 2.3.18 have been released</a>.</li>
<li>Rails 3.2.12 was released February 11, 2013 with an “update immediately” security fix. See <a href="http://weblog.rubyonrails.org/2013/2/11/SEC-ANN-Rails-3-2-12-3-1-11-and-2-3-17-have-been-released/">Rails 3.2.12, 3.1.11, and 2.3.17 have been released</a>.</li>
<li>Rails 3.2.11 was released January 8, 2013 with an “upgrade right now!” security fix. Security researcher <a href="https://twitter.com/hdmoore">HD Moore</a> called it, “The worst security issue that the Rails platform has seen to date” (<a href="https://community.rapid7.com/community/metasploit/blog/2013/01/10/exploiting-ruby-on-rails-with-metasploit-cve-2013-0156">details</a> and <a href="http://news.ycombinator.com/item?id=5035023">discussion</a>). If you’re running any earlier version of Rails, your application and its server are vulnerable to attack and the exploit code is readily available. See <a href="http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/">Rails 3.2.11, 3.1.10, 3.0.19, and 2.3.15 have been released</a> and a preliminary <a href="http://www.insinuator.net/2013/01/rails-yaml/">Analysis of Rails <span class="caps">XML</span> Parameter Parsing Vulnerability</a>.<br>
Rails 3.2.10 was released January 2, 2013 with a fix for a <a href="http://blog.phusion.nl/2013/01/03/rails-sql-injection-vulnerability-hold-your-horses-here-are-the-facts/">Rails <span class="caps">SQL</span> injection vulnerability</a>. See <a href="http://weblog.rubyonrails.org/2013/1/2/Rails-3-2-10--3-1-9--and-3-0-18-have-been-released/">Rails 3.2.10, 3.1.9, and 3.0.18 have been released</a>
</li>
<li>Rails 3.2.9 was released November 12, 2012 with many small bug fixes. See <a href="http://weblog.rubyonrails.org/2012/11/12/ann-rails-3-2-9-has-been-released/">Rails version 3.2.9 has been released</a>.</li>
<li>Rails 3.2.8 was released August 9, 2012 with a security fix that potentially impacts all users. See <a href="http://weblog.rubyonrails.org/2012/8/9/ann-rails-3-2-8-has-been-released/">Rails version 3.2.8 has been released</a>.</li>
<li>Rails 3.2.7 was released July 26, 2012 with a security fix for digest authentication plus various minor fixes. See <a href="http://weblog.rubyonrails.org/2012/7/26/ann-rails-3-2-7-has-been-released/">Rails version 3.2.7 has been released</a>.</li>
<li>Rails 3.2.6 was released June 12, 2012 with two important security fixes. See <a href="http://weblog.rubyonrails.org/2012/6/12/ann-rails-3-2-6-has-been-released/">Rails version 3.2.6 has been released</a>.</li>
<li>Rails 3.2.5 was released June 1, 2012 to correct a regression in Rails 3.2.4. See <a href="http://weblog.rubyonrails.org/2012/5/31/ann-rails-3-2-5-has-been-released/">Rails version 3.2.5 has been released</a>.</li>
<li>Rails 3.2.4 was released May 31, 2012 with minor bug fixes plus two important security fixes. See <a href="http://weblog.rubyonrails.org/2012/5/31/ann-rails-3-2-4-has-been-released/">Rails version 3.2.4 has been released</a>.</li>
<li>Rails 3.2.3 was released March 31, 2012 with improved protection from mass assignment vulnerabilities. See the <a href="http://weblog.rubyonrails.org/2012/3/30/ann-rails-3-2-3-has-been-released/">Rails 3.2.3 Announcement</a>.</li>
<li>Rails 3.2.2 was released March 1, 2012 with some minor bug fixes plus two important security fixes. See the <a href="http://weblog.rubyonrails.org/2012/3/1/ann-rails-3-2-2-has-been-released">Rails 3.2.2 Announcement</a>.</li>
<li>Rails 3.2.1 was released January 26, 2012 with some minor fixes. See <a href="https://gist.github.com/1685812">Ruby on Rails v3.2.1 Changelogs</a>.</li>
</ul>
<h2>Rails 3.1</h2>
<p>Rails 3.1.0 was released August 31, 2011. Eight release candidates were released beginning May 21, 2011. Rails 3.1 introduced the <a href="http://www.youtube.com/watch?v=cGdCI2HhfAU">asset pipeline</a> which enables proper organization of <span class="caps">CSS</span> and JavaScript. Other features include <a href="http://railscasts.com/episodes/266-http-streaming"><span class="caps">HTTP</span> streaming</a>, default jQuery, reversible migrations, mountable engines, identity map, prepared statements, Rack::Cache on by default, forced <span class="caps">SSL</span>, role-based mass-assignment protection, has_secure_password, and custom serializers. See the <a href="http://weblog.rubyonrails.org/2011/5/22/rails-3-1-release-candidate">Rails 3.1 release candidate announcement</a> for details. There’s a <a href="http://railscasts.com/episodes/265-rails-3-1-overview">Rails 3.1 Overview</a> from Ryan Bates and a <a href="https://gist.github.com/958283">changelog</a> for all the details. Yehuda Katz explains <a href="http://yehudakatz.com/2011/06/14/what-the-hell-is-happening-to-rails/">What’s Up With All These Changes in Rails?</a>. The best overview of Rails 3.1 is Michael Hartl’s <a href="http://ruby.railstutorial.org/chapters/rails-3-1#top">chapter on Rails 3.1</a> in his Ruby on Rails Tutorial book.</p>
<p><em>What You Need to Know:</em> The greatest impact for developers moving from Rails 3.0 to 3.1 is the new location for <span class="caps">CSS</span> and JavaScript files and changes to the application layout file. See the official <a href="http://guides.rubyonrails.org/asset_pipeline.html">Rails 3.1 Asset Pipeline guide</a> for details.</p>
<h2>Rails Release History</h2>
<p>The official Rails blog describes all <a href="http://weblog.rubyonrails.org/releases/">major and minor Rails releases</a>.</p>
<p>The Rubygems.org site lists <a href="https://rubygems.org/gems/rails/versions">every Rails gem version</a>, with release dates, including patch releases, release candidates, and beta releases.</p>
<table>
<tr>
<th>Version </th>
<th>Date </th>
<th>Information </th>
</tr>
<tr>
<td> 5.0 (beta) </td>
<td> December 18, 2015 </td>
<td> <a href="http://weblog.rubyonrails.org/2015/12/18/Rails-5-0-beta1/">Announcement</a> and <a href="http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html">Release Notes</a> </td>
</tr>
<tr>
<td> 4.2 </td>
<td> August 20, 2014 </td>
<td> <a href="http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/">Announcement</a> and <a href="http://edgeguides.rubyonrails.org/4_2_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 4.1 </td>
<td> April 8, 2014 </td>
<td> <a href="http://weblog.rubyonrails.org/2014/4/8/Rails-4-1/">Announcement</a> and <a href="http://guides.rubyonrails.org/4_1_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 4.0 </td>
<td> June 25, 2013 </td>
<td> <a href="http://weblog.rubyonrails.org/2013/6/25/Rails-4-0-final/">Announcement</a> and <a href="http://guides.rubyonrails.org/4_0_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 3.2 </td>
<td> January 20, 2012 </td>
<td> <a href="http://weblog.rubyonrails.org/2012/1/20/rails-3-2-0-faster-dev-mode-routing-explain-queries-tagged-logger-store/">Announcement</a> and <a href="http://guides.rubyonrails.org/3_2_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 3.1 </td>
<td> August 31, 2011 </td>
<td> <a href="http://weblog.rubyonrails.org/2011/5/21/rails-3-1-release-candidate/">Announcement</a> and <a href="http://guides.rubyonrails.org/3_1_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 3.0 </td>
<td> August 29, 2010 </td>
<td> <a href="http://weblog.rubyonrails.org/2010/8/29/rails-3-0-it-s-done">Announcement</a> and <a href="http://guides.rubyonrails.org/3_0_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 2.3 </td>
<td> March 16, 2009 </td>
<td> <a href="http://weblog.rubyonrails.org/2009/3/16/rails-2-3-templates-engines-rack-metal-much-more">Announcement</a> and <a href="http://guides.rubyonrails.org/2_3_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 2.2 </td>
<td> November 21, 2008 </td>
<td> <a href="http://weblog.rubyonrails.org/2008/11/21/rails-2-2-i18n-http-validators-thread-safety-jruby-1-9-compatibility-docs/">Announcement</a> and <a href="http://guides.rubyonrails.org/2_2_release_notes.html">Release Notes</a> </td>
</tr>
<tr>
<td> 2.1 </td>
<td> June 1, 2008 </td>
<td> <a href="http://weblog.rubyonrails.org/2008/5/31/rails-2-1-time-zones-dirty-caching-gem-dependencies-caching-etc/">Announcement</a> </td>
</tr>
<tr>
<td> 2.0 </td>
<td> December 7, 2007 </td>
<td> <a href="http://weblog.rubyonrails.org/2007/12/7/rails-2-0-it-s-done/">Announcement</a> </td>
</tr>
<tr>
<td> 1.2 </td>
<td> January 19, 2007 </td>
<td> <a href="http://weblog.rubyonrails.org/2007/1/18/rails-1-2-rest-admiration-http-lovefest-and-utf-8-celebrations/">Announcement</a> </td>
</tr>
<tr>
<td> 1.0 </td>
<td> December 13, 2005 </td>
<td> <a href="http://weblog.rubyonrails.org/2005/12/13/rails-1-0-party-like-its-one-oh-oh/">Announcement</a> </td>
</tr>
</table>
<h2>Credits</h2>
<p>Daniel Kehoe compiled the information and wrote the summaries.</p>
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