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Ruby 4.0.0 preview2 Released (#3674)
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‎_data/branches.yml‎

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# date: date of first stable release (YYYY-MM-DD)
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# eol_date: date of EOL (YYYY-MM-DD)
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- name: 4.0
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status: preview
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date:
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eol_date:
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- name: 3.5
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status: preview
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date:

‎_data/downloads.yml‎

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# optional
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preview:
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- 4.0.0-preview2
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- 3.5.0-preview1
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stable:

‎_data/releases.yml‎

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# In order to get the release listed on the downloads page,
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# you also need to add an entry to `_data/downloads.yml'.
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# 4.0 series
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- version: 4.0.0-preview2
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date: 2025-11-17
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post: /en/news/2025/11/17/ruby-4-0-0-preview2-released/
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tag: v4_0_0_preview2
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stats:
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files_changed: 3607
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insertions: 197451
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deletions: 285607
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url:
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gz: https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0-preview2.tar.gz
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zip: https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0-preview2.zip
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xz: https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0-preview2.tar.xz
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size:
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gz: 23444451
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zip: 28933540
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xz: 17554228
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sha1:
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gz: 132e450bbee3f61ed0b463ed1e2bd3a3a324339c
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zip: 48a235cfbfd4252dce81da870c792e32309e62b9
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xz: f8e8b98ea85ac82610ab601a21dc9a90c5c56a97
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sha256:
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gz: 0a3330dae710302e11f7f0323e83219ab3c6517984691a312c662f329c5120e1
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zip: f5c68ee44dfcb76b61c07c437fa945814dfc516570b1c921506ac886960160ca
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xz: 0b92b15466d77a9d7e59e4a75f050d42cd50fe96c951d2b3b9f8029394cd9a43
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sha512:
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gz: b5e681cc84be59148485b9a2212dcf54d61cfee27431ceddb49bedc8baa913ec8b36da43242cb4f1791b25e4bfc1dcf72b5527288a0656f2933da898d0e0b40f
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zip: 508c685e46a641c74e2968daf650559503ce2bcaac3403654713adb2345c3ede2bace929294a1367afecac5edd6b2c42fa833f5313456f78c79151d310c860cf
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xz: 7afaa8d8e832ef0ded28f1caf874da69f16105e1b3aad5947c6911364159b4c6ebd3d7ea5d7d86708e9f2f06a047921b8302ca6e75ec429a3da846845f896976
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# 3.5 series
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- version: 3.5.0-preview1

‎en/news/_posts/2025-11-17-ruby-4-0-0-preview2-released.md‎

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---
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layout: news_post
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title: "Ruby 4.0.0 preview2 Released"
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author: "naruse"
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translator:
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date: 2025-11-17 00:00:00 +0000
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lang: en
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---
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{% assign release = site.data.releases | where: "version", "4.0.0-preview2" | first %}
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We are pleased to announce the release of Ruby {{ release.version }}. Ruby 4.0 updates its Unicode version to 15.1.0, and so on.
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## Language changes
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* `*nil` no longer calls `nil.to_a`, similar to how `**nil` does
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not call `nil.to_hash`. [[Feature #21047]]
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## Core classes updates
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Note: We're only listing notable updates of Core class.
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* Binding
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* `Binding#local_variables` does no longer include numbered parameters.
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Also, `Binding#local_variable_get` and `Binding#local_variable_set` reject to handle numbered parameters.
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[[Bug #21049]]
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* IO
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* `IO.select` accepts +Float::INFINITY+ as a timeout argument.
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[[Feature #20610]]
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* String
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* Update Unicode to Version 15.1.0 and Emoji Version 15.1. [[Feature #19908]]
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(also applies to Regexp)
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## Standard Library updates
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Note: We're only listing notable updates of Standard librarires.
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* ostruct 0.6.1
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* pstore 0.2.0
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* benchmark 0.4.0
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* logger 1.7.0
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* rdoc 6.13.1
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* win32ole 1.9.2
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* irb 1.15.2
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* reline 0.6.1
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* readline 0.0.4
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* fiddle 1.1.6
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## Compatibility issues
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Note: Excluding feature bug fixes.
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## Standard library compatibility issues
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## C API updates
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## JIT
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* YJIT
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* YJIT stats
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* `ratio_in_yjit` no longer works in the default build.
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Use `--enable-yjit=stats` on `configure` to enable it on `--yjit-stats`.
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* Add `invalidate_everything` to default stats, which is
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incremented when every code is invalidated by TracePoint.
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* Add `mem_size:` and `call_threshold:` options to `RubyVM::YJIT.enable`.
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* ZJIT
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* Add an experimental method-based JIT compiler.
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Use `--enable-zjit` on `configure` to enable the `--zjit` support.
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* As of Ruby 4.0.0-preview2, ZJIT is not yet ready for speeding up most benchmarks.
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Please refrain from evaluating ZJIT just yet. Stay tuned for the Ruby 4.0 release.
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* RJIT
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* `--rjit` is removed. We will move the implementation of the third-party JIT API
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to the [ruby/rjit](https://github.com/ruby/rjit) repository.
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## Miscellaneous changes
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See [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md)
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or [commit logs](https://github.com/ruby/ruby/compare/v3_4_0...{{ release.tag }})
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for more details.
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With those changes, [{{ release.stats.files_changed }} files changed, {{ release.stats.insertions }} insertions(+), {{ release.stats.deletions }} deletions(-)](https://github.com/ruby/ruby/compare/v3_4_0...{{ release.tag }}#file_bucket)
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since Ruby 3.4.0!
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## Download
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* <{{ release.url.gz }}>
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SIZE: {{ release.size.gz }}
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SHA1: {{ release.sha1.gz }}
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SHA256: {{ release.sha256.gz }}
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SHA512: {{ release.sha512.gz }}
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* <{{ release.url.xz }}>
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SIZE: {{ release.size.xz }}
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SHA1: {{ release.sha1.xz }}
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SHA256: {{ release.sha256.xz }}
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SHA512: {{ release.sha512.xz }}
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* <{{ release.url.zip }}>
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SIZE: {{ release.size.zip }}
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SHA1: {{ release.sha1.zip }}
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SHA256: {{ release.sha256.zip }}
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SHA512: {{ release.sha512.zip }}
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## What is Ruby
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Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993,
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and is now developed as Open Source. It runs on multiple platforms
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and is used all over the world especially for web development.

‎ja/news/_posts/2025-11-17-ruby-4-0-0-preview2-released.md‎

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---
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layout: news_post
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title: "Ruby 4.0.0 preview2 リリース"
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author: "naruse"
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translator:
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date: 2025-11-17 00:00:00 +0000
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lang: ja
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---
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{% assign release = site.data.releases | where: "version", "4.0.0-preview2" | first %}
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Ruby {{ release.version }} が公開されました。Ruby 4.0では、Unicodeバージョンの15.1.0へのアップデートなど様々な改善が行われています。
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## 言語機能の変更
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* `*nil` no longer calls `nil.to_a`, similar to how `**nil` does
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not call `nil.to_hash`. [[Feature #21047]]
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## コアクラスのアップデート
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注: 複数のアップデートの中から注目すべきアップデートのみを掲載しています。
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* Binding
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* `Binding#local_variables` does no longer include numbered parameters.
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Also, `Binding#local_variable_get` and `Binding#local_variable_set` reject to handle numbered parameters.
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[[Bug #21049]]
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* IO
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* `IO.select` accepts +Float::INFINITY+ as a timeout argument.
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[[Feature #20610]]
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* String
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* Update Unicode to Version 15.1.0 and Emoji Version 15.1. [[Feature #19908]]
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(also applies to Regexp)
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## 標準ライブラリのアップデート
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注: 複数のアップデートの中から注目すべき標準ライブラリのアップデートのみを掲載しています。
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## 互換性に関する変更
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注: 不具合修正を除きます。
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## 標準ライブラリの互換性の変更
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## C API のアップデート
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## JIT
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* YJIT
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* YJIT stats
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* デフォルトビルドでは `ratio_in_yjit` が機能しなくなりました。
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`--yjit-stats` で有効にするためには、`configure` で `--enable-yjit=stats` を使用してください。
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* トレースポイントによってすべてのコードが無効化されたときに増加する `invalidate_everything` をYJIT statsにデフォルトで追加します。
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* `RubyVM::YJIT.enable` に `mem_size:` と `call_threshold:` オプションを追加します。
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* ZJIT
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* 実験的なメソッドベースのJITコンパイラを追加しました。
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`--enable-zjit` を `configure` で使用して `--zjit` のサポートを有効にしてください。
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* Ruby 4.0.0-preview2の時点で、ZJITはまだほとんどのベンチマークを高速化する準備が整っていません。
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ZJITの性能評価はRuby 4.0のリリースまでお控えください。
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* RJIT
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* `--rjit` は削除されました。サードパーティのJIT APIの実装を
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[ruby/rjit](https://github.com/ruby/rjit) リポジトリに移行します。
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## その他の変更点
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より詳細な情報は [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md)
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か [commit logs](https://github.com/ruby/ruby/compare/v3_4_0...{{ release.tag }}) を参照してください。
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これらの変更により、Ruby 3.4.0から [{{ release.stats.files_changed }} ファイルが変更され、 {{ release.stats.insertions }} 行が追加され、 {{ release.stats.deletions }} 行が削除されました!deletions(-)](https://github.com/ruby/ruby/compare/v3_4_0...{{ release.tag }}#file_bucket)
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## Download
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* <{{ release.url.gz }}>
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SIZE: {{ release.size.gz }}
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SHA1: {{ release.sha1.gz }}
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SHA256: {{ release.sha256.gz }}
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SHA512: {{ release.sha512.gz }}
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* <{{ release.url.xz }}>
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SIZE: {{ release.size.xz }}
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SHA1: {{ release.sha1.xz }}
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SHA256: {{ release.sha256.xz }}
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SHA512: {{ release.sha512.xz }}
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* <{{ release.url.zip }}>
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SIZE: {{ release.size.zip }}
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SHA1: {{ release.sha1.zip }}
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SHA256: {{ release.sha256.zip }}
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SHA512: {{ release.sha512.zip }}
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## What is Ruby
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Rubyはまつもとゆきひろ (Matz) によって1993年に開発が始められ、今もオープンソースソフトウェアとして開発が続けられています。Rubyは様々なプラットフォームで動き、世界中で、特にWebアプリケーション開発のために使われています。

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