We are pleased to announce the release of Ruby 2.1.0-preview1.
Please check out the new features in Ruby 2.1 before the final release!

## Download

We recommend to use
[https://cache.ruby-lang.org/pub/ruby/2.1/](https://cache.ruby-lang.org/pub/ruby/2.1/)
via Fastly.

* [https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.tar.bz2](https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.tar.bz2)

      SIZE:   11475553 bytes
      MD5:    d32d1ea23988399afadbd21c5a7a37fc
      SHA256: 860b90d28b214393fd9d77ac2ad65b384d8249cd59b658c668cf0c7bad1db341

* [https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.tar.gz](https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.tar.gz)

      SIZE:   14449544 bytes
      MD5:    9df4f546f6b961895ba58a8afdf857da
      SHA256: 747472fb33bcc529f1000e5320605a7e166a095d3805520b989e73b33c05b046

* [https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.zip](https://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0-preview1.zip)

      SIZE:   16124069 bytes
      MD5:    f9bc3f9a10174a022381ce2c60a59e64
      SHA256: 28855621f7d364277e7f258d5cc380e005896ef8ebc36e5cbf78d2bf763c291b

## Changes

The notable changes are:

* VM (method cache)
* RGenGC (See ko1's [RubyKaigi presentation](http://rubykaigi.org/2013/talk/S73) and [EuRuKo presentation](http://www.atdot.net/~ko1/activities/Euruko2013-ko1.pdf))
* refinements
* syntax
  * Decimal Literal
  * Frozen String Literal
* def's return value
* Bignum
  * 128bit
  * GMP
* String#scrub
* Socket.getifaddrs
* new RubyGems

See more details of changes: [NEWS in Ruby repository (WIP)](https://github.com/ruby/ruby/blob/trunk/NEWS).

ko1 exhibited toruby presentation: [Summary of Ruby 2.1](http://www.atdot.net/~ko1/activities/toruby05-ko1.pdf)

Konstantin Haase (@konstantinhaase) wrote a good summary in his blog post: [What's new in Ruby 2.1?](http://rkh.im/ruby-2.1).

## Release Comment

Known issues are:

[https://bugs.ruby-lang.org/projects/ruby-trunk/issues?query_id=102](https://bugs.ruby-lang.org/projects/ruby-trunk/issues?query_id=102)

See also the release schedule and other information:

[https://bugs.ruby-lang.org/projects/ruby-master/wiki/ReleaseEngineering210](https://bugs.ruby-lang.org/projects/ruby-master/wiki/ReleaseEngineering210)