We are pleased to announce the release of Ruby 2.3.0.

This is the first stable release of the Ruby 2.3 series.
It introduces many new features, for example:

A frozen string literal pragma
is introduced.
With Ruby 2.1, "str".freeze has been optimized to reduce object allocation.
Ruby 2.3 introduces a new magic comment and command line option to
freeze all string literals in the source files.
Additionally for debugging, you can get where the object is created on
"can't modify frozen String" error by using the
--debug=frozen-string-literal command line option.

A safe navigation operator
(so-called lonely operator) &.,
which already exists in C#, Groovy, and Swift, is introduced to ease
nil handling as obj&.foo. Array#dig and Hash#dig are also added.
Note that this behaves like try! of Active Support,
which specially handles only nil.

The did_you_mean gem is bundled.
The did_you_mean gem
shows the candidates on the NameError and NoMethodError to ease

RubyVM::InstructionSequence#to_binary and .load_from_binary are introduced as experimental features. With these features, we can make a ISeq (bytecode) pre-compilation system.

Ruby 2.3 also includes many performance improvements, for example
reconsidering method entry data structure,
introducing new table data structure,
optimizing Proc#call,
machine code level tuning for object allocation and method calling code,
smarter instance variable data structure,
exception: false keyword argument support on Socket#*_nonblock methods,
and so on. Check the “Implementation improvements” section in the NEWS file.

For a complete list of new features and compatibility notes, please see
NEWS and

With those changes, 2946 files changed, 104057 insertions(+), 59478 deletions(-) since Ruby 2.2.0!

Merry Christmas, Happy Holidays, and enjoy programming with Ruby 2.3!


  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.bz2

    SIZE:   14185617 bytes
    SHA1:   6c8a832d49d22755ea8c45b6d53faf2ccc6d6ac9
    SHA256: ec7579eaba2e4c402a089dbc86c98e5f1f62507880fd800b9b34ca30166bfa5e
    SHA512: 77b707359e754c3616699d21697752741497c719dc3d6fdfb55ed639e76d52560d293ae54cbe5c63be78dc73fbe60f1b8615d704d017bdfe1994aa9747d26a6c
  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.gz

    SIZE:   17648682 bytes
    SHA1:   2dfcf7f33bda4078efca30ae28cb89cd0e36ddc4
    SHA256: ba5ba60e5f1aa21b4ef8e9bf35b9ddb57286cb546aac4b5a28c71f459467e507
    SHA512: 914d0201ecefaeb67aca0531146d2e89900833d8d2a597ec8a19be94529ab6b4be367f9b0cee2868b407288896cc14b64d96150223cac0aef8aafc46fc3dd7cc
  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.xz

    SIZE:   11294412 bytes
    SHA1:   96e620e38af351c8da63e40cfe217ec79f912ba1
    SHA256: 70125af0cfd7048e813a5eecab3676249582bfb65cfd57b868c3595f966e4097
    SHA512: d893c5e6db5a0533e0da48d899c619964388852ef90e7d1b92a4363d5f189cd2dba32a009581f62b9f42a8e6027975fc3c18b64faf356f5e3ac43a8d69ec5327
  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.zip

    SIZE:   19840511 bytes
    SHA1:   3f88617568d9a4f491e8b32dca532363f73eaa71
    SHA256: 8270bdcbc6b62a18fdf1b75bd28d5d6fc0fc26b9bd778d422393a1b98006020a
    SHA512: a3f397bb3c9c19d9b797552c5d60bb01c82db884cfa966df84881125bea35713cffd99f88fb86b271bae72d9cfb09ad9b33838cffcf6365c091459479914fdef

Posted by naruse on 25 Dec 2015

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