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December 2025

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[ruby-list:51036] Ruby 4.0.0 リリース
by NARUSE, Yui 25 Dec '25

25 Dec '25

Ruby 4.0.0 が公開されました。 Ruby 4.0 には "Ruby Box"、"ZJIT" ほか多数の改善が含まれています。 ## Ruby Box Ruby Boxはクラス等の定義の分離／隔離のための機能を提供する、実験的機能です。Ruby Boxは環境変数として `RUBY_BOX=1` を指定することで有効化できます。クラス名は `Ruby::Box` です。 Boxの中で読み込まれた定義はそのBox内に閉じた状態となります。Ruby Boxが隔離できる定義としては、既存クラスへのモンキーパッチ、グローバル変数やクラス変数の操作、クラスやモジュールの定義、そして.rbファイルや拡張ライブラリとして実装されたライブラリ類です。 Ruby Boxの主要なユースケースとしては、次のものが想定されています: * テストのために何かの挙動を上書きするようなモンキーパッチを必要とするテストケースをBox内に閉じて実行すること * WebアプリケーションをBox内で実行することで、Blue-Greenデプロイメントをプロセス内で、アプリケーションサーバ上で実行すること * WebアプリケーションをBox内で実行することで、依存関係の更新時などに、一定期間並列で動かしてRubyコードを用いてレスポンス等を検証すること * (未設計の)「パッケージAPI」のような新しい高レベルAPIを作るための低レベルAPIとしての機能を提供すること "Ruby Box"の詳細については次のドキュメントを参照してください: [doc/language/box.md](doc/language/box.md). [[Feature #21311]] [[Misc #21385]] ## ZJIT ZJIT は、YJIT の次世代として開発された新しい just-in-time（JIT）コンパイラです。ZJIT サポート付きで Ruby をビルドするには Rust 1.85.0 以降が必要で、--zjit を指定すると ZJIT が有効になります。私たちが Ruby 向けに新しいコンパイラを開発しているのは、パフォーマンスの上限を引き上げ（より大きなコンパイル単位サイズと SSA IR を導入）つつ、より一般的なデザインであるメソッドコンパイラにすることで、外部からの貢献を促進したいからです。詳しくは [ブログ記事](https://railsatscale.com/2025-12-24-launch-zjit/) をご覧ください。  ZJITは通常の Ruby インタプリタより高速ですが、まだ YJIT ほど速くはありません。ZJIT をぜひ試してみて欲しいですが、現時点では本番環境へのデプロイは控えたほうがよいかもしれません。Ruby 4.1 の ZJIT にご期待ください。 ## Ractor の改善 Ruby で簡単に並列処理を行うための Ractor に多くの改善がありました。まず、`Ractor::Port` というクラスを加え、メッセージの送受信についのて問題を解決しました（[ブログ記事](https://product.st.inc/entry/2025/06/24/110606)）。また、`Ractor.shareable_proc`によって、ProcをRactor間で共有しやすくしました。性能面では、多くのデータ構造を改善し、グローバルロックに対する競合が大幅に減少し、並列処理性能を向上しました。また、Ractor 間で共有するデータを減らすことで、並列実行時の CPU キャッシュの衝突を減らしました。 Ruby 3.0 で experimental feature として導入されましたが、来年くらいには experimental を取りたいと思っています。 ## 言語仕様の変更 * `*nil` は `nil.to_a` を呼ばなくなりました。`**nil` が `nil.to_hash` を呼ばないのと同様です。[[Feature #21047]] * 行頭の論理二項演算子（`||`、`&&`、`and`、`or`）は、ドット記法のように前の行を継続するようになりました。次のコードは同等です。 ```ruby if condition1 && condition2 ... end ``` 従来の書き方: ```ruby if condition1 && condition2 ... end ``` ```ruby if condition1 && condition2 ... end ``` [[Feature #20925]] ## コアクラスの更新注: 特筆すべきクラス更新のみを記載しています。 * Array * `array.reverse_each.find` より効率的な代替として `Array#rfind` を追加しました。[[Feature #21678]] * `Enumerable#find` をより効率的に実行する `Array#find` を追加しました。[[Feature #21678]] * Binding * `Binding#local_variables` は番号付きパラメータを含めなくなりました。また、`Binding#local_variable_get`、`Binding#local_variable_set`、`Binding#local_variable_defined?` は番号付きパラメータを扱わないようになりました。[[Bug #21049]] * 番号付きパラメータおよび "it" パラメータにアクセスするために、`Binding#implicit_parameters`、`Binding#implicit_parameter_get`、`Binding#implicit_parameter_defined?` を追加しました。[[Bug #21049]] * Enumerator * `Enumerator.produce` がオプションのキーワード引数 `size` を受け付けるようになりました。サイズには整数、`Float::INFINITY`、ラムダなどの呼び出し可能オブジェクト、または不明を示す `nil` を指定できます。省略時は `Float::INFINITY` です。 ```ruby # 無限列挙子 enum = Enumerator.produce(1, size: Float::INFINITY, &:succ) enum.size # => Float::INFINITY # サイズが既知/計算可能な有限列挙子 abs_dir = File.expand_path("./baz") # => "/foo/bar/baz" traverser = Enumerator.produce(abs_dir, size: -> { abs_dir.count("/") + 1 }) { raise StopIteration if it == "/" File.dirname(it) } traverser.size # => 4 ``` [[Feature #21701]] * ErrorHighlight * `ArgumentError` が発生した際に、メソッド呼び出し側（caller）とメソッド定義側（callee）の両方のコードスニペットを表示するようになりました。[[Feature #21543]] ``` test.rb:1:in 'Object#add': wrong number of arguments (given 1, expected 2) (ArgumentError) caller: test.rb:3 | add(1) ^^^ callee: test.rb:1 | def add(x, y) = x + y ^^^ from test.rb:3:in '<main>' ``` * Fiber * `Kernel#raise` と同様に `Fiber#raise(cause:)` 引数をサポートしました。[[Feature #21360]] * Fiber::Scheduler * 指定した例外でファイバを中断する `Fiber::Scheduler#fiber_interrupt` を追加しました。初期用途は、IO 操作が閉じられたときにブロッキング IO を待っているファイバを中断することです。[[Feature #21166]] * シグナル例外が無効なときでもスケジューラが処理を続行できるよう、`Fiber::Scheduler#yield` を追加しました。[[Bug #21633]] * 非同期 `IO#close` 用の `Fiber::Scheduler#io_close` フックを再導入しました。 * IO 書き込みバッファを flush する際に `Fiber::Scheduler#io_write` を呼び出すようになりました。[[Bug #21789]] * File * カーネルとファイルシステムが対応していれば、statx システムコール経由で Linux でも `File::Stat#birthtime` が利用可能になりました。[[Feature #21205]] * IO * `IO.select` がタイムアウト引数として `Float::INFINITY` を受け付けるようになりました。[[Feature #20610]] * `|` で始まる `IO` クラスメソッドによるプロセス生成という非推奨挙動を削除しました。[[Feature #19630]] * Kernel * `Kernel#inspect` は `#instance_variables_to_inspect` メソッドの有無を確認し、`#inspect` 文字列に表示するインスタンス変数を制御できるようになりました。 ```ruby class DatabaseConfig def initialize(host, user, password) @host = host @user = user @password = password end private def instance_variables_to_inspect = [:@host, :@user] end conf = DatabaseConfig.new("localhost", "root", "hunter2") conf.inspect #=> #<DatabaseConfig:0x0000000104def350 @host="localhost", @user="root"> ``` [[Feature #21219]] * `|` で始まる `Kernel#open` によるプロセス生成という非推奨挙動を削除しました。[[Feature #19630]] * Math * `Math.log1p` と `Math.expm1` を追加しました。[[Feature #21527]] * Pathname * Pathname は default gem から Ruby のコアクラスに昇格しました。[[Feature #17473]] * Proc * `Proc#parameters` は匿名のオプション引数を `[:opt, nil]` ではなく `[:opt]` と表示するようになり、必須匿名引数の場合と整合しました。[[Bug #20974]] * Ractor * Ractor 間の通信のための新しい同期機構として `Ractor::Port` クラスを追加しました。[[Feature #21262]] ```ruby port1 = Ractor::Port.new port2 = Ractor::Port.new Ractor.new port1, port2 do |port1, port2| port1 << 1 port2 << 11 port1 << 2 port2 << 12 end 2.times{ p port1.receive } #=> 1, 2 2.times{ p port2.receive } #=> 11, 12 ``` `Ractor::Port` は次のメソッドを提供します。 * `Ractor::Port#receive` * `Ractor::Port#send`（または `Ractor::Port#<<`） * `Ractor::Port#close` * `Ractor::Port#closed?` この結果、`Ractor.yield` と `Ractor#take` は削除されました。 * Ractor の終了待ちを行うために `Ractor#join` と `Ractor#value` を追加しました。`Thread#join`、`Thread#value` に相当します。 * `Ractor#join` を実装するために内部で使われる低レベルインターフェイスとして `Ractor#monitor` と `Ractor#unmonitor` を追加しました。 * `Ractor.select` は Ractor と Port のみを受け付けるようになりました。Ractor が与えられた場合は、その Ractor が終了すると戻ります。 * 各 `Ractor` はデフォルトポートを持ち、`Ractor.send`、`Ractor.receive` で使用されるようになりました (`Ractor#default_port` を追加)。 * `Ractor#close_incoming` と `Ractor#close_outgoing` は削除されました。 * 共有可能な Proc / lambda を作るために `Ractor.shareable_proc` と `Ractor.shareable_lambda` を追加しました。[[Feature #21550]] [[Feature #21557]] * Range * `Range#to_set` はサイズチェックを行うようになり、終端のない範囲での問題を防ぎます。[[Bug #21654]] * `Range#overlap?` は無限（非境界）範囲を正しく扱うようになりました。[[Bug #21185]] * 始点のない整数範囲での `Range#max` の挙動を修正しました。[[Bug #21174]] [[Bug #21175]] * Ruby * Ruby に関する定数を含む新しいトップレベルモジュール `Ruby` を定義しました。このモジュールは Ruby 3.4 で予約されており、今回正式に定義されました。[[Feature #20884]] * Ruby::Box * 定義の分離を提供する新しい（実験的）機能です。詳細は [doc/language/box.md](doc/language/box.md) を参照してください。[[Feature #21311]] [[Misc #21385]] * Set * `Set` は自動ロードされる stdlib クラスからコアクラスになりました。[[Feature #21216]] * `Set#inspect` は配列リテラル風の簡潔な表示になりました（例: `#<Set: {1, 2, 3}>` ではなく `Set[1, 2, 3]`）。[[Feature #21389]] * `Set#to_set` と `Enumerable#to_set` への引数指定は非推奨になりました。[[Feature #21390]] * Socket * `Socket.tcp` と `TCPSocket.new` が初回接続のタイムアウトを指定するキーワード引数 `open_timeout` を受け付けるようになりました。[[Feature #21347]] * `TCPSocket.new` でユーザー指定タイムアウトが発生した場合、状況により `Errno::ETIMEDOUT` または `IO::TimeoutError` が発生し得ましたが、今後は一貫して `IO::TimeoutError` を発生させます（ただし `Socket.tcp` では同様の状況で `Errno::ETIMEDOUT` となる場合があり、OS レベルのタイムアウトではいずれの場合も `Errno::ETIMEDOUT` が発生する可能性があります）。 * String * Unicode を Version 17.0.0、Emoji を Version 17.0 に更新しました（Regexp にも適用）。[[Feature #19908]][[Feature #20724]][[Feature #21275]] * `String#strip`、`strip!`、`lstrip`、`lstrip!`、`rstrip`、`rstrip!` が `*selectors` 引数を受け付けるようになりました。[[Feature #21552]] * Thread * `Kernel#raise` と同様に `Thread#raise(cause:)` 引数をサポートしました。[[Feature #21360]] ## Stdlib の更新ここでは注目すべき機能変更のみを記載します。その他の変更は以下のセクションに記載しています。また、前回バンドル版（Ruby 3.4.0）からの GitHub リリース履歴がある場合はそれも記載しています。次の bundled gem が default gem から昇格しました。 * ostruct 0.6.3 * 0.6.1 to [v0.6.2][ostruct-v0.6.2], [v0.6.3][ostruct-v0.6.3] * pstore 0.2.0 * 0.1.4 to [v0.2.0][pstore-v0.2.0] * benchmark 0.5.0 * 0.4.0 to [v0.4.1][benchmark-v0.4.1], [v0.5.0][benchmark-v0.5.0] * logger 1.7.0 * 1.6.4 to [v1.6.5][logger-v1.6.5], [v1.6.6][logger-v1.6.6], [v1.7.0][logger-v1.7.0] * rdoc 7.0.2 * 6.14.0 to [v6.14.1][rdoc-v6.14.1], [v6.14.2][rdoc-v6.14.2], [v6.15.0][rdoc-v6.15.0], [v6.15.1][rdoc-v6.15.1], [v6.16.0][rdoc-v6.16.0], [v6.16.1][rdoc-v6.16.1], [v6.17.0][rdoc-v6.17.0], [v7.0.0][rdoc-v7.0.0], [v7.0.1][rdoc-v7.0.1], [v7.0.2][rdoc-v7.0.2], [v7.0.3][rdoc-v7.0.3] * win32ole 1.9.2 * 1.9.1 to [v1.9.2][win32ole-v1.9.2] * irb 1.16.0 * 1.14.3 to [v1.15.0][irb-v1.15.0], [v1.15.1][irb-v1.15.1], [v1.15.2][irb-v1.15.2], [v1.15.3][irb-v1.15.3], [v1.16.0][irb-v1.16.0] * reline 0.6.3 * 0.6.0 to [v0.6.1][reline-v0.6.1], [v0.6.2][reline-v0.6.2], [v0.6.3][reline-v0.6.3] * readline 0.0.4 * fiddle 1.1.8 * 1.1.6 to [v1.1.7][fiddle-v1.1.7], [v1.1.8][fiddle-v1.1.8] 次のデフォルト gem を追加しました。 * win32-registry 0.1.2 次の default gem を更新しました。 * RubyGems 4.0.3 * bundler 4.0.3 * date 3.5.1 * 3.4.1 to [v3.5.0][date-v3.5.0], [v3.5.1][date-v3.5.1] * delegate 0.6.1 * 0.4.0 to [v0.5.0][delegate-v0.5.0], [v0.6.0][delegate-v0.6.0], [v0.6.1][delegate-v0.6.1] * digest 3.2.1 * 3.2.0 to [v3.2.1][digest-v3.2.1] * english 0.8.1 * 0.8.0 to [v0.8.1][english-v0.8.1] * erb 6.0.1 * 4.0.4 to [v5.1.2][erb-v5.1.2], [v5.1.3][erb-v5.1.3], [v6.0.0][erb-v6.0.0], [v6.0.1][erb-v6.0.1] * error_highlight 0.7.1 * etc 1.4.6 * fcntl 1.3.0 * 1.2.0 to [v1.3.0][fcntl-v1.3.0] * fileutils 1.8.0 * 1.7.3 to [v1.8.0][fileutils-v1.8.0] * forwardable 1.4.0 * 1.3.3 to [v1.4.0][forwardable-v1.4.0] * io-console 0.8.2 * 0.8.1 to [v0.8.2][io-console-v0.8.2] * io-nonblock 0.3.2 * io-wait 0.4.0 * 0.3.2 to [v0.3.3][io-wait-v0.3.3], [v0.3.5.test1][io-wait-v0.3.5.test1], [v0.3.5][io-wait-v0.3.5], [v0.3.6][io-wait-v0.3.6], [v0.4.0][io-wait-v0.4.0] * ipaddr 1.2.8 * json 2.18.0 * 2.9.1 to [v2.10.0][json-v2.10.0], [v2.10.1][json-v2.10.1], [v2.10.2][json-v2.10.2], [v2.11.0][json-v2.11.0], [v2.11.1][json-v2.11.1], [v2.11.2][json-v2.11.2], [v2.11.3][json-v2.11.3], [v2.12.0][json-v2.12.0], [v2.12.1][json-v2.12.1], [v2.12.2][json-v2.12.2], [v2.13.0][json-v2.13.0], [v2.13.1][json-v2.13.1], [v2.13.2][json-v2.13.2], [v2.14.0][json-v2.14.0], [v2.14.1][json-v2.14.1], [v2.15.0][json-v2.15.0], [v2.15.1][json-v2.15.1], [v2.15.2][json-v2.15.2], [v2.16.0][json-v2.16.0], [v2.17.0][json-v2.17.0], [v2.17.1][json-v2.17.1], [v2.18.0][json-v2.18.0] * net-http 0.9.1 * 0.6.0 to [v0.7.0][net-http-v0.7.0], [v0.8.0][net-http-v0.8.0], [v0.9.0][net-http-v0.9.0], [v0.9.1][net-http-v0.9.1] * openssl 4.0.0 * 3.3.1 to [v3.3.2][openssl-v3.3.2], [v4.0.0][openssl-v4.0.0] * optparse 0.8.1 * 0.6.0 to [v0.7.0][optparse-v0.7.0], [v0.8.0][optparse-v0.8.0], [v0.8.1][optparse-v0.8.1] * pp 0.6.3 * 0.6.2 to [v0.6.3][pp-v0.6.3] * prism 1.7.0 * 1.5.2 to [v1.6.0][prism-v1.6.0], [v1.7.0][prism-v1.7.0] * psych 5.3.1 * 5.2.2 to [v5.2.3][psych-v5.2.3], [v5.2.4][psych-v5.2.4], [v5.2.5][psych-v5.2.5], [v5.2.6][psych-v5.2.6], [v5.3.0][psych-v5.3.0], [v5.3.1][psych-v5.3.1] * resolv 0.7.0 * 0.6.2 to [v0.6.3][resolv-v0.6.3], [v0.7.0][resolv-v0.7.0] * stringio 3.2.0 * 3.1.2 to [v3.1.3][stringio-v3.1.3], [v3.1.4][stringio-v3.1.4], [v3.1.5][stringio-v3.1.5], [v3.1.6][stringio-v3.1.6], [v3.1.7][stringio-v3.1.7], [v3.1.8][stringio-v3.1.8], [v3.1.9][stringio-v3.1.9], [v3.2.0][stringio-v3.2.0] * strscan 3.1.6 * 3.1.2 to [v3.1.3][strscan-v3.1.3], [v3.1.4][strscan-v3.1.4], [v3.1.5][strscan-v3.1.5], [v3.1.6][strscan-v3.1.6] * time 0.4.2 * 0.4.1 to [v0.4.2][time-v0.4.2] * timeout 0.6.0 * 0.4.3 to [v0.4.4][timeout-v0.4.4], [v0.5.0][timeout-v0.5.0], [v0.6.0][timeout-v0.6.0] * uri 1.1.1 * 1.0.4 to [v1.1.0][uri-v1.1.0], [v1.1.1][uri-v1.1.1] * weakref 0.1.4 * 0.1.3 to [v0.1.4][weakref-v0.1.4] * zlib 3.2.2 * 3.2.1 to [v3.2.2][zlib-v3.2.2] 次の bundled gem を更新しました。 * minitest 6.0.0 * power_assert 3.0.1 * 2.0.5 to [v3.0.0][power_assert-v3.0.0], [v3.0.1][power_assert-v3.0.1] * rake 13.3.1 * 13.2.1 to [v13.3.0][rake-v13.3.0], [v13.3.1][rake-v13.3.1] * test-unit 3.7.3 * 3.6.7 to [3.6.8][test-unit-3.6.8], [3.6.9][test-unit-3.6.9], [3.7.0][test-unit-3.7.0], [3.7.1][test-unit-3.7.1], [3.7.2][test-unit-3.7.2], [3.7.3][test-unit-3.7.3], [3.7.4][test-unit-3.7.4], [3.7.5][test-unit-3.7.5] * rexml 3.4.4 * rss 0.3.2 * 0.3.1 to [0.3.2][rss-0.3.2] * net-ftp 0.3.9 * 0.3.8 to [v0.3.9][net-ftp-v0.3.9] * net-imap 0.6.2 * 0.5.8 to [v0.5.9][net-imap-v0.5.9], [v0.5.10][net-imap-v0.5.10], [v0.5.11][net-imap-v0.5.11], [v0.5.12][net-imap-v0.5.12], [v0.5.13][net-imap-v0.5.13], [v0.6.0][net-imap-v0.6.0], [v0.6.1][net-imap-v0.6.1], [v0.6.2][net-imap-v0.6.2] * net-smtp 0.5.1 * 0.5.0 to [v0.5.1][net-smtp-v0.5.1] * matrix 0.4.3 * 0.4.2 to [v0.4.3][matrix-v0.4.3] * prime 0.1.4 * 0.1.3 to [v0.1.4][prime-v0.1.4] * rbs 3.10.0 * 3.8.0 to [v3.8.1][rbs-v3.8.1], [v3.9.0.dev.1][rbs-v3.9.0.dev.1], [v3.9.0.pre.1][rbs-v3.9.0.pre.1], [v3.9.0.pre.2][rbs-v3.9.0.pre.2], [v3.9.0][rbs-v3.9.0], [v3.9.1][rbs-v3.9.1], [v3.9.2][rbs-v3.9.2], [v3.9.3][rbs-v3.9.3], [v3.9.4][rbs-v3.9.4], [v3.9.5][rbs-v3.9.5], [v3.10.0.pre.1][rbs-v3.10.0.pre.1], [v3.10.0.pre.2][rbs-v3.10.0.pre.2], [v3.10.0][rbs-v3.10.0] * typeprof 0.31.1 * debug 1.11.1 * 1.11.0 to [v1.11.1][debug-v1.11.1] * base64 0.3.0 * 0.2.0 to [v0.3.0][base64-v0.3.0] * bigdecimal 4.0.1 * 3.1.8 to [v3.2.0][bigdecimal-v3.2.0], [v3.2.1][bigdecimal-v3.2.1], [v3.2.2][bigdecimal-v3.2.2], [v3.2.3][bigdecimal-v3.2.3], [v3.3.0][bigdecimal-v3.3.0], [v3.3.1][bigdecimal-v3.3.1], [v4.0.0][bigdecimal-v4.0.0], [v4.0.1][bigdecimal-v4.0.1] * drb 2.2.3 * 2.2.1 to [v2.2.3][drb-v2.2.3] * syslog 0.3.0 * 0.2.0 to [v0.3.0][syslog-v0.3.0] * csv 3.3.5 * 3.3.2 to [v3.3.3][csv-v3.3.3], [v3.3.4][csv-v3.3.4], [v3.3.5][csv-v3.3.5] * repl_type_completor 0.1.12 ### RubyGems と Bundler RubyGems と Bundler は Version 4 が同梱されています。詳細は次のリンクを参照してください。 * [Upgrading to RubyGems/Bundler 4 - RubyGems Blog](https://blog.rubygems.org/2025/12/03/upgrade-to-rubygems-bundler-4.ht… * [4.0.0 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/03/4.0.0-released.html) * [4.0.1 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/09/4.0.1-released.html) * [4.0.2 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/17/4.0.2-released.html) * [4.0.3 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/23/4.0.3-released.html) ## サポートプラットフォーム * Windows * _MSC_VER 1900 より古い MSVC をサポート対象外としました。つまり Visual Studio 2015 以降が必須になります。 ## 互換性に関する注意 * `Ractor::Port` 追加に伴い、Ractor から次のメソッドを削除しました。 * `Ractor.yield` * `Ractor#take` * `Ractor#close_incoming` * `Ractor#close_outgoing` [[Feature #21262]] * `ObjectSpace._id2ref` は非推奨になりました。[[Feature #15408]] * `Process::Status#&` と `Process::Status#>>` を削除しました（Ruby 3.3 で非推奨）。[[Bug #19868]] * `$SAFE` のパスチェック（Ruby 2.7 で削除）に使われ、既に非推奨だった `rb_path_check` を削除しました。[[Feature #20971]] * "wrong number of arguments" の `ArgumentError` のバックトレースに、受け手のクラス/モジュール名が含まれるようになりました（例: `bar` ではなく `Foo#bar`）。[[Bug #21698]] * バックトレースに `internal` フレームが表示されなくなりました。C 実装メソッドも、他の C 実装と同様に Ruby ソースファイル上にあるかのように表示されます。[[Bug #20968]] 変更前: ``` ruby -e '[1].fetch_values(42)' <internal:array>:211:in 'Array#fetch': index 42 outside of array bounds: -1...1 (IndexError) from <internal:array>:211:in 'block in Array#fetch_values' from <internal:array>:211:in 'Array#map!' from <internal:array>:211:in 'Array#fetch_values' from -e:1:in '<main>' ``` 変更後: ``` $ ruby -e '[1].fetch_values(42)' -e:1:in 'Array#fetch_values': index 42 outside of array bounds: -1...1 (IndexError) from -e:1:in '<main>' ``` ## Stdlib 互換性の注意 * CGI ライブラリは default gem から除外されました。現在は次のメソッド向けに `cgi/escape` のみ提供します。 * `CGI.escape` / `CGI.unescape` * `CGI.escapeHTML` / `CGI.unescapeHTML` * `CGI.escapeURIComponent` / `CGI.unescapeURIComponent` * `CGI.escapeElement` / `CGI.unescapeElement` [[Feature #21258]] * `Set` が stdlib からコアクラスへ移動したため、`set/sorted_set.rb` を削除し、`SortedSet` は自動ロードされる定数ではなくなりました。利用する場合は `sorted_set` gem をインストールし、`require 'sorted_set'` してください。[[Feature #21287]] * Net::HTTP * ボディ（本文）を持つリクエスト（例：POST、PUT）において、Content-Type ヘッダーが明示的に設定されていない場合に、デフォルトで application/x-www-form-urlencoded を自動設定する挙動が削除されました。もしアプリケーションがこの自動設定に依存していた場合、今後は Content-Type ヘッダーなしでリクエストが送信されることになり、特定のサーバーとの互換性が失われる可能性があります。 [[GH-net-http #205]] ## C API の更新 * IO * `rb_thread_fd_close` は非推奨になり、何もしなくなりました。C 拡張でファイルディスクリプタを Ruby コードに公開する必要がある場合は、`RUBY_IO_MODE_EXTERNAL` を使って `IO` インスタンスを作成し、`rb_io_close(io)` で閉じてください（これにより、その IO 上のすべての保留操作が割り込まれ、完了を待ちます）。ディスクリプタを直接閉じても保留操作は割り込まれず、未定義動作を招く可能性があります。言い換えると、同じファイルディスクリプタを共有する 2 つの `IO` オブジェクトの片方を閉じても、もう一方には影響しません。[[Feature #18455]] * GVL * `rb_thread_call_with_gvl` は GVL の有無にかかわらず動作するようになりました。これにより gem は `ruby_thread_has_gvl_p` を確認せずに済みますが、GVL の扱いには引き続き注意してください。[[Feature #20750]] * Set * `Set` の C API を追加しました。次のメソッドをサポートします。[[Feature #21459]] * `rb_set_foreach` * `rb_set_new` * `rb_set_new_capa` * `rb_set_lookup` * `rb_set_add` * `rb_set_clear` * `rb_set_delete` * `rb_set_size` ## 実装の改善 * `Class#new`（例: `Object.new`）が全般的に高速化され、特にキーワード引数を渡す場合に効果があります。YJIT と ZJIT にも取り込まれました。[[Feature #21254]] * サイズプールの異なる GC ヒープを独立して成長させるようにし、一部のプールだけに長寿命オブジェクトがある場合のメモリ使用量を削減しました。 * 大きなオブジェクトページでの GC スイープが高速化されました。 * "Generic ivar" オブジェクト（String、Array、`TypedData` など）は、新しい内部 "fields" オブジェクトを使ってインスタンス変数アクセスを高速化します。 * GC は内部の `id2ref` テーブルを初回使用まで保持しないようにし、`object_id` の割り当てと GC スイープを高速化しました。 * Class / Module オブジェクトでの `object_id` と `hash` が高速化されました。 * より大きな多倍長整数でも可変幅アロケーションにより埋め込みのまま保持できるようになりました。 * `Random`、`Enumerator::Product`、`Enumerator::Chain`、`Addrinfo`、`StringScanner`、および一部内部オブジェクトが書き込みバリア保護され、GC のオーバーヘッドを削減します。 ### Ractor Ractor をより安定・高性能・実用的にするため多くの改善を行いました。これらにより Ractor 実装は実験的ステータスを脱する段階に近づいています。 * パフォーマンス改善 * 凍結文字列とシンボルテーブルが内部でロックフリーのハッシュセットを使用します。[[Feature #21268]] * メソッドキャッシュの参照で多くの場合ロックを回避します。 * クラス（および generic ivar）のインスタンス変数アクセスが高速化され、ロックを避けます。 * Ractor ごとのカウンタを用いてオブジェクト割り当てでの CPU キャッシュ競合を回避します。 * スレッドローカルカウンタを用いて xmalloc/xfree での CPU キャッシュ競合を回避します。 * 多くの場合 `object_id` 取得でロックを回避します。 * バグ修正と安定性 * Ractor と Thread の併用で起こり得るデッドロックを修正しました。 * Ractor 内での require / autoload の問題を修正しました。 * Ractor 間のエンコーディング/トランスコード問題を修正しました。 * GC 操作やメソッド無効化に関する競合を修正しました。 * Ractor 起動後にプロセスを fork する際の問題を修正しました。 * Ractor 環境下で GC の割り当てカウントが正確になりました。 * GC 後に TracePoint が動作しない問題を修正しました。[[Bug #19112]] ## JIT * ZJIT * [メソッドベースの実験的 JIT コンパイラ](https://docs.ruby-lang.org/en/master/jit/zjit_md.html) を導入しました。利用可能な場合、ZJIT は `--zjit` オプションまたは `RubyVM::ZJIT.enable` を呼び出すことで実行時に有効化できます。 Ruby をビルドする場合、ZJIT サポートを含めるには Rust 1.85.0 以降が必要です。 * Ruby 4.0.0 時点で ZJIT はインタプリタより高速ですが、まだ YJIT には及びません。ZJIT の試用を推奨しますが、現時点では本番利用を推奨しません。 * 目標は Ruby 4.1 で ZJIT を YJIT より高速かつ本番対応にすることです。 * YJIT * `RubyVM::YJIT.runtime_stats` * デフォルトビルドでは `ratio_in_yjit` は利用できなくなりました。`configure` で `--enable-yjit=stats` を付け、`--yjit-stats` で有効化してください。 * すべてのコードが TracePoint により無効化された回数を表す `invalidate_everything` をデフォルト統計に追加しました。 * `RubyVM::YJIT.enable` に `mem_size:` と `call_threshold:` オプションを追加しました。 * RJIT * `--rjit` を削除しました。サードパーティ JIT API の実装は [ruby/rjit](https://github.com/ruby/rjit) リポジトリに移します。より詳細な情報は [NEWS](https://github.com/ruby/ruby/blob/v4.0.0/NEWS.md) か [commit logs](https://github.com/ruby/ruby/compare/v3_4_0...v4.0.0) を参照してください。これらの変更により、Ruby 3.4.0から [3889 ファイルが変更され、 230769 行が追加され、 297003 行が削除されました!deletions(-)](https://github.com/ruby/ruby/compare/v3_4_0...v4.0.… メリークリスマス、良いお年を、そして Happy Hacking with Ruby 4.0! ！ ## Download * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.gz> SIZE: 23955109 SHA1: 754e39e9ad122e1b6deaed860350bac133a35ed3 SHA256: 2e8389c8c072cb658c93a1372732d9eac84082c88b065750db1e52a5ac630271 SHA512: 688254e939b197d564e896fb951bc1abf07142f489e91c5ed0b11f68f52d6adb6b1f86616fe03f1f0bb434beeef7e75e158b9c616afb39bb34403b0b78d2ee19 * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.xz> SIZE: 18008368 SHA1: 05ec670e86f84325c5353ef2f2888e53b6adc602 SHA256: a72bacee9de07283ebc19baa4ac243b193129f21aa4e168c7186fb1fe7d07fe1 SHA512: 2d5b2e566eaf70a5f3ea6ce6afc0611c0415de58a41336ef7a0b855c9a91eda9aa790a5f8b48e40a1eb9d50f8ea0f687216e617f16c8d040a08474f3116518a4 * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.zip> SIZE: 29253204 SHA1: 0b69f89d1d140157251c0d3a6032f6c45cdf81e8 SHA256: 70cb1bf89279b86ab9a975d504607c051fc05ee03e311d550a5541b65e373455 SHA512: a72e076ef618c0aeb9d20cf22e6fb12fda36809c0064ef0f98153b95a0bac257ef606342444a38f992c4594bf376a4d264686cf597463aa6f111220798784302 ## What is Ruby 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。 [Feature #15408]: https://bugs.ruby-lang.org/issues/15408 [Feature #17473]: https://bugs.ruby-lang.org/issues/17473 [Feature #18455]: https://bugs.ruby-lang.org/issues/18455 [Bug #19112]: https://bugs.ruby-lang.org/issues/19112 [Feature #19630]: https://bugs.ruby-lang.org/issues/19630 [Bug #19868]: https://bugs.ruby-lang.org/issues/19868 [Feature #19908]: https://bugs.ruby-lang.org/issues/19908 [Feature #20610]: https://bugs.ruby-lang.org/issues/20610 [Feature #20724]: https://bugs.ruby-lang.org/issues/20724 [Feature #20750]: https://bugs.ruby-lang.org/issues/20750 [Feature #20884]: https://bugs.ruby-lang.org/issues/20884 [Feature #20925]: https://bugs.ruby-lang.org/issues/20925 [Bug #20968]: https://bugs.ruby-lang.org/issues/20968 [Feature #20971]: https://bugs.ruby-lang.org/issues/20971 [Bug #20974]: https://bugs.ruby-lang.org/issues/20974 [Feature #21047]: https://bugs.ruby-lang.org/issues/21047 [Bug #21049]: https://bugs.ruby-lang.org/issues/21049 [Feature #21166]: https://bugs.ruby-lang.org/issues/21166 [Bug #21174]: https://bugs.ruby-lang.org/issues/21174 [Bug #21175]: https://bugs.ruby-lang.org/issues/21175 [Bug #21185]: https://bugs.ruby-lang.org/issues/21185 [Feature #21205]: https://bugs.ruby-lang.org/issues/21205 [Feature #21216]: https://bugs.ruby-lang.org/issues/21216 [Feature #21219]: https://bugs.ruby-lang.org/issues/21219 [Feature #21254]: https://bugs.ruby-lang.org/issues/21254 [Feature #21258]: https://bugs.ruby-lang.org/issues/21258 [Feature #21268]: https://bugs.ruby-lang.org/issues/21268 [Feature #21262]: https://bugs.ruby-lang.org/issues/21262 [Feature #21275]: https://bugs.ruby-lang.org/issues/21275 [Feature #21287]: https://bugs.ruby-lang.org/issues/21287 [Feature #21311]: https://bugs.ruby-lang.org/issues/21311 [Feature #21347]: https://bugs.ruby-lang.org/issues/21347 [Feature #21360]: https://bugs.ruby-lang.org/issues/21360 [Misc #21385]: https://bugs.ruby-lang.org/issues/21385 [Feature #21389]: https://bugs.ruby-lang.org/issues/21389 [Feature #21390]: https://bugs.ruby-lang.org/issues/21390 [Feature #21459]: https://bugs.ruby-lang.org/issues/21459 [Feature #21527]: https://bugs.ruby-lang.org/issues/21527 [Feature #21543]: https://bugs.ruby-lang.org/issues/21543 [Feature #21550]: https://bugs.ruby-lang.org/issues/21550 [Feature #21552]: https://bugs.ruby-lang.org/issues/21552 [Feature #21557]: https://bugs.ruby-lang.org/issues/21557 [Bug #21633]: https://bugs.ruby-lang.org/issues/21633 [Bug #21654]: https://bugs.ruby-lang.org/issues/21654 [Feature #21678]: https://bugs.ruby-lang.org/issues/21678 [Bug #21698]: https://bugs.ruby-lang.org/issues/21698 [Feature #21701]: https://bugs.ruby-lang.org/issues/21701 [Bug #21789]: https://bugs.ruby-lang.org/issues/21789 [GH-net-http #205]: https://github.com/ruby/net-http/issues/205 [ostruct-v0.6.2]: https://github.com/ruby/ostruct/releases/tag/v0.6.2 [ostruct-v0.6.3]: https://github.com/ruby/ostruct/releases/tag/v0.6.3 [pstore-v0.2.0]: https://github.com/ruby/pstore/releases/tag/v0.2.0 [benchmark-v0.4.1]: https://github.com/ruby/benchmark/releases/tag/v0.4.1 [benchmark-v0.5.0]: https://github.com/ruby/benchmark/releases/tag/v0.5.0 [logger-v1.6.5]: https://github.com/ruby/logger/releases/tag/v1.6.5 [logger-v1.6.6]: https://github.com/ruby/logger/releases/tag/v1.6.6 [logger-v1.7.0]: https://github.com/ruby/logger/releases/tag/v1.7.0 [rdoc-v6.14.1]: https://github.com/ruby/rdoc/releases/tag/v6.14.1 [rdoc-v6.14.2]: https://github.com/ruby/rdoc/releases/tag/v6.14.2 [rdoc-v6.15.0]: https://github.com/ruby/rdoc/releases/tag/v6.15.0 [rdoc-v6.15.1]: https://github.com/ruby/rdoc/releases/tag/v6.15.1 [rdoc-v6.16.0]: https://github.com/ruby/rdoc/releases/tag/v6.16.0 [rdoc-v6.16.1]: https://github.com/ruby/rdoc/releases/tag/v6.16.1 [rdoc-v6.17.0]: https://github.com/ruby/rdoc/releases/tag/v6.17.0 [rdoc-v7.0.0]: https://github.com/ruby/rdoc/releases/tag/v7.0.0 [rdoc-v7.0.1]: https://github.com/ruby/rdoc/releases/tag/v7.0.1 [rdoc-v7.0.2]: https://github.com/ruby/rdoc/releases/tag/v7.0.2 [rdoc-v7.0.3]: https://github.com/ruby/rdoc/releases/tag/v7.0.3 [win32ole-v1.9.2]: https://github.com/ruby/win32ole/releases/tag/v1.9.2 [irb-v1.15.0]: https://github.com/ruby/irb/releases/tag/v1.15.0 [irb-v1.15.1]: https://github.com/ruby/irb/releases/tag/v1.15.1 [irb-v1.15.2]: https://github.com/ruby/irb/releases/tag/v1.15.2 [irb-v1.15.3]: https://github.com/ruby/irb/releases/tag/v1.15.3 [irb-v1.16.0]: https://github.com/ruby/irb/releases/tag/v1.16.0 [reline-v0.6.1]: https://github.com/ruby/reline/releases/tag/v0.6.1 [reline-v0.6.2]: https://github.com/ruby/reline/releases/tag/v0.6.2 [reline-v0.6.3]: https://github.com/ruby/reline/releases/tag/v0.6.3 [fiddle-v1.1.7]: https://github.com/ruby/fiddle/releases/tag/v1.1.7 [fiddle-v1.1.8]: https://github.com/ruby/fiddle/releases/tag/v1.1.8 [date-v3.5.0]: https://github.com/ruby/date/releases/tag/v3.5.0 [date-v3.5.1]: https://github.com/ruby/date/releases/tag/v3.5.1 [delegate-v0.5.0]: https://github.com/ruby/delegate/releases/tag/v0.5.0 [delegate-v0.6.0]: https://github.com/ruby/delegate/releases/tag/v0.6.0 [delegate-v0.6.1]: https://github.com/ruby/delegate/releases/tag/v0.6.1 [digest-v3.2.1]: https://github.com/ruby/digest/releases/tag/v3.2.1 [english-v0.8.1]: https://github.com/ruby/english/releases/tag/v0.8.1 [erb-v5.1.2]: https://github.com/ruby/erb/releases/tag/v5.1.2 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1 0

[ruby-list:51035] Ruby 4.0.0 Released
by NARUSE, Yui 25 Dec '25

25 Dec '25

We are pleased to announce the release of Ruby 4.0.0. Ruby 4.0 introduces "Ruby Box" and "ZJIT", and adds many improvements. ## Ruby Box Ruby Box is a new (experimental) feature to provide separation about definitions. Ruby Box is enabled when an environment variable `RUBY_BOX=1` is specified. The class is `Ruby::Box`. Definitions loaded in a box are isolated in the box. Ruby Box can isolate/separate monkey patches, changes of global/class variables, class/module definitions, and loaded native/ruby libraries from other boxes. Expected use cases are: * Run test cases in box to protect other tests when the test case uses monkey patches to override something * Run web app boxes in parallel to execute blue-green deployment on an app server in a Ruby process * Run web app boxes in parallel to evaluate dependency updates for a certain period of time by checking response diff using Ruby code * Used as the foundation (low-level) API to implement kind of "package" (high-level) API (it is not designed yet) For the detail of "Ruby Box", see [doc/language/box.md](doc/language/box.md). [[Feature #21311]] [[Misc #21385]] ## ZJIT ZJIT is a new just-in-time (JIT) compiler, which is developed as the next generation of YJIT. You need Rust 1.85.0 or newer to build Ruby with ZJIT support, and ZJIT is enabled when `--zjit` is specified. We're building a new compiler for Ruby because we want to both raise the performance ceiling (bigger compilation unit size and SSA IR) and encourage more outside contribution (by becoming a more traditional method compiler). See [our blog post](https://railsatscale.com/2025-12-24-launch-zjit/) for more details.  ZJIT is faster than the interpreter, but not yet as fast as YJIT. We encourage you to experiment with ZJIT, but maybe hold off on deploying it in production for now. Stay tuned for Ruby 4.1 ZJIT. ## Ractor Improvements Ractor, Ruby's parallel execution mechanism, has received several improvements. A new class, `Ractor::Port`, was introduced to address issues related to message sending and receiving (see [our blog post](https://dev.to/ko1/ractorport-revamping-the-ractor-api-98)). Additionally, `Ractor.shareable_proc` makes it easier to share `Proc` objects between Ractors. On the performance side, many internal data structures have been improved to significantly reduce contention on a global lock, unlocking better parallelism. Ractors also now share less internal data, resulting in less CPU cache contention when running in parallel. Ractor was first introduced in Ruby 3.0 as an experimental feature. We aim to remove its "experimental" status next year. ## Language changes * `*nil` no longer calls `nil.to_a`, similar to how `**nil` does not call `nil.to_hash`. [[Feature #21047]] * Logical binary operators (`||`, `&&`, `and` and `or`) at the beginning of a line continue the previous line, like fluent dot. The following code examples are equal: ```ruby if condition1 && condition2 ... end ``` Previously: ```ruby if condition1 && condition2 ... end ``` ```ruby if condition1 && condition2 ... end ``` [[Feature #20925]] ## Core classes updates Note: We're only listing outstanding class updates. * Array * `Array#rfind` has been added as a more efficient alternative to `array.reverse_each.find` [[Feature #21678]] * `Array#find` has been added as a more efficient override of `Enumerable#find` [[Feature #21678]] * Binding * `Binding#local_variables` does no longer include numbered parameters. Also, `Binding#local_variable_get`, `Binding#local_variable_set`, and `Binding#local_variable_defined?` reject to handle numbered parameters. [[Bug #21049]] * `Binding#implicit_parameters`, `Binding#implicit_parameter_get`, and `Binding#implicit_parameter_defined?` have been added to access numbered parameters and "it" parameter. [[Bug #21049]] * Enumerator * `Enumerator.produce` now accepts an optional `size` keyword argument to specify the size of the enumerator. It can be an integer, `Float::INFINITY`, a callable object (such as a lambda), or `nil` to indicate unknown size. When not specified, the size defaults to `Float::INFINITY`. ```ruby # Infinite enumerator enum = Enumerator.produce(1, size: Float::INFINITY, &:succ) enum.size # => Float::INFINITY # Finite enumerator with known/computable size abs_dir = File.expand_path("./baz") # => "/foo/bar/baz" traverser = Enumerator.produce(abs_dir, size: -> { abs_dir.count("/") + 1 }) { raise StopIteration if it == "/" File.dirname(it) } traverser.size # => 4 ``` [[Feature #21701]] * ErrorHighlight * When an ArgumentError is raised, it now displays code snippets for both the method call (caller) and the method definition (callee). [[Feature #21543]] ``` test.rb:1:in 'Object#add': wrong number of arguments (given 1, expected 2) (ArgumentError) caller: test.rb:3 | add(1) ^^^ callee: test.rb:1 | def add(x, y) = x + y ^^^ from test.rb:3:in '<main>' ``` * Fiber * Introduce support for `Fiber#raise(cause:)` argument similar to `Kernel#raise`. [[Feature #21360]] * Fiber::Scheduler * Introduce `Fiber::Scheduler#fiber_interrupt` to interrupt a fiber with a given exception. The initial use case is to interrupt a fiber that is waiting on a blocking IO operation when the IO operation is closed. [[Feature #21166]] * Introduce `Fiber::Scheduler#yield` to allow the fiber scheduler to continue processing when signal exceptions are disabled. [[Bug #21633]] * Reintroduce the `Fiber::Scheduler#io_close` hook for asynchronous `IO#close`. * Invoke `Fiber::Scheduler#io_write` when flushing the IO write buffer. [[Bug #21789]] * File * `File::Stat#birthtime` is now available on Linux via the statx system call when supported by the kernel and filesystem. [[Feature #21205]] * IO * `IO.select` accepts `Float::INFINITY` as a timeout argument. [[Feature #20610]] * A deprecated behavior, process creation by `IO` class methods with a leading `|`, was removed. [[Feature #19630]] * Kernel * `Kernel#inspect` now checks for the existence of a `#instance_variables_to_inspect` method, allowing control over which instance variables are displayed in the `#inspect` string: ```ruby class DatabaseConfig def initialize(host, user, password) @host = host @user = user @password = password end private def instance_variables_to_inspect = [:@host, :@user] end conf = DatabaseConfig.new("localhost", "root", "hunter2") conf.inspect #=> #<DatabaseConfig:0x0000000104def350 @host="localhost", @user="root"> ``` [[Feature #21219]] * A deprecated behavior, process creation by `Kernel#open` with a leading `|`, was removed. [[Feature #19630]] * Math * `Math.log1p` and `Math.expm1` are added. [[Feature #21527]] * Pathname * Pathname has been promoted from a default gem to a core class of Ruby. [[Feature #17473]] * Proc * `Proc#parameters` now shows anonymous optional parameters as `[:opt]` instead of `[:opt, nil]`, making the output consistent with when the anonymous parameter is required. [[Bug #20974]] * Ractor * `Ractor::Port` class was added for a new synchronization mechanism to communicate between Ractors. [[Feature #21262]] ```ruby port1 = Ractor::Port.new port2 = Ractor::Port.new Ractor.new port1, port2 do |port1, port2| port1 << 1 port2 << 11 port1 << 2 port2 << 12 end 2.times{ p port1.receive } #=> 1, 2 2.times{ p port2.receive } #=> 11, 12 ``` `Ractor::Port` provides the following methods: * `Ractor::Port#receive` * `Ractor::Port#send` (or `Ractor::Port#<<`) * `Ractor::Port#close` * `Ractor::Port#closed?` As a result, `Ractor.yield` and `Ractor#take` were removed. * `Ractor#join` and `Ractor#value` were added to wait for the termination of a Ractor. These are similar to `Thread#join` and `Thread#value`. * `Ractor#monitor` and `Ractor#unmonitor` were added as low-level interfaces used internally to implement `Ractor#join`. * `Ractor.select` now only accepts Ractors and Ports. If Ractors are given, it returns when a Ractor terminates. * `Ractor#default_port` was added. Each `Ractor` has a default port, which is used by `Ractor.send`, `Ractor.receive`. * `Ractor#close_incoming` and `Ractor#close_outgoing` were removed. * `Ractor.shareable_proc` and `Ractor.shareable_lambda` are introduced to make shareable Proc or lambda. [[Feature #21550]], [[Feature #21557]] * Range * `Range#to_set` now performs size checks to prevent issues with endless ranges. [[Bug #21654]] * `Range#overlap?` now correctly handles infinite (unbounded) ranges. [[Bug #21185]] * `Range#max` behavior on beginless integer ranges has been fixed. [[Bug #21174]] [[Bug #21175]] * Ruby * A new toplevel module `Ruby` has been defined, which contains Ruby-related constants. This module was reserved in Ruby 3.4 and is now officially defined. [[Feature #20884]] * Ruby::Box * A new (experimental) feature to provide separation about definitions. For the detail of "Ruby Box", see [doc/language/box.md](doc/language/box.md). [[Feature #21311]] [[Misc #21385]] * Set * `Set` is now a core class, instead of an autoloaded stdlib class. [[Feature #21216]] * `Set#inspect` now uses a simpler display, similar to literal arrays. (e.g., `Set[1, 2, 3]` instead of `#<Set: {1, 2, 3}>`). [[Feature #21389]] * Passing arguments to `Set#to_set` and `Enumerable#to_set` is now deprecated. [[Feature #21390]] * Socket * `Socket.tcp` & `TCPSocket.new` accepts an `open_timeout` keyword argument to specify the timeout for the initial connection. [[Feature #21347]] * When a user-specified timeout occurred in `TCPSocket.new`, either `Errno::ETIMEDOUT` or `IO::TimeoutError` could previously be raised depending on the situation. This behavior has been unified so that `IO::TimeoutError` is now consistently raised. (Please note that, in `Socket.tcp`, there are still cases where `Errno::ETIMEDOUT` may be raised in similar situations, and that in both cases `Errno::ETIMEDOUT` may be raised when the timeout occurs at the OS level.) * String * Update Unicode to Version 17.0.0 and Emoji Version 17.0. [[Feature #19908]][[Feature #20724]][[Feature #21275]] (also applies to Regexp) * `String#strip`, `strip!`, `lstrip`, `lstrip!`, `rstrip`, and `rstrip!` are extended to accept `*selectors` arguments. [[Feature #21552]] * Thread * Introduce support for `Thread#raise(cause:)` argument similar to `Kernel#raise`. [[Feature #21360]] ## Stdlib updates We only list stdlib changes that are notable feature changes. Other changes are listed in the following sections. We also listed release history from the previous bundled version that is Ruby 3.4.0 if it has GitHub releases. The following bundled gems are promoted from default gems. * ostruct 0.6.3 * 0.6.1 to [v0.6.2][ostruct-v0.6.2], [v0.6.3][ostruct-v0.6.3] * pstore 0.2.0 * 0.1.4 to [v0.2.0][pstore-v0.2.0] * benchmark 0.5.0 * 0.4.0 to [v0.4.1][benchmark-v0.4.1], [v0.5.0][benchmark-v0.5.0] * logger 1.7.0 * 1.6.4 to [v1.6.5][logger-v1.6.5], [v1.6.6][logger-v1.6.6], [v1.7.0][logger-v1.7.0] * rdoc 7.0.2 * 6.14.0 to [v6.14.1][rdoc-v6.14.1], [v6.14.2][rdoc-v6.14.2], [v6.15.0][rdoc-v6.15.0], [v6.15.1][rdoc-v6.15.1], [v6.16.0][rdoc-v6.16.0], [v6.16.1][rdoc-v6.16.1], [v6.17.0][rdoc-v6.17.0], [v7.0.0][rdoc-v7.0.0], [v7.0.1][rdoc-v7.0.1], [v7.0.2][rdoc-v7.0.2], [v7.0.3][rdoc-v7.0.3] * win32ole 1.9.2 * 1.9.1 to [v1.9.2][win32ole-v1.9.2] * irb 1.16.0 * 1.14.3 to [v1.15.0][irb-v1.15.0], [v1.15.1][irb-v1.15.1], [v1.15.2][irb-v1.15.2], [v1.15.3][irb-v1.15.3], [v1.16.0][irb-v1.16.0] * reline 0.6.3 * 0.6.0 to [v0.6.1][reline-v0.6.1], [v0.6.2][reline-v0.6.2], [v0.6.3][reline-v0.6.3] * readline 0.0.4 * fiddle 1.1.8 * 1.1.6 to [v1.1.7][fiddle-v1.1.7], [v1.1.8][fiddle-v1.1.8] The following default gem is added. * win32-registry 0.1.2 The following default gems are updated. * RubyGems 4.0.3 * bundler 4.0.3 * date 3.5.1 * 3.4.1 to [v3.5.0][date-v3.5.0], [v3.5.1][date-v3.5.1] * delegate 0.6.1 * 0.4.0 to [v0.5.0][delegate-v0.5.0], [v0.6.0][delegate-v0.6.0], [v0.6.1][delegate-v0.6.1] * digest 3.2.1 * 3.2.0 to [v3.2.1][digest-v3.2.1] * english 0.8.1 * 0.8.0 to [v0.8.1][english-v0.8.1] * erb 6.0.1 * 4.0.4 to [v5.1.2][erb-v5.1.2], [v5.1.3][erb-v5.1.3], [v6.0.0][erb-v6.0.0], [v6.0.1][erb-v6.0.1] * error_highlight 0.7.1 * etc 1.4.6 * fcntl 1.3.0 * 1.2.0 to [v1.3.0][fcntl-v1.3.0] * fileutils 1.8.0 * 1.7.3 to [v1.8.0][fileutils-v1.8.0] * forwardable 1.4.0 * 1.3.3 to [v1.4.0][forwardable-v1.4.0] * io-console 0.8.2 * 0.8.1 to [v0.8.2][io-console-v0.8.2] * io-nonblock 0.3.2 * io-wait 0.4.0 * 0.3.2 to [v0.3.3][io-wait-v0.3.3], [v0.3.5.test1][io-wait-v0.3.5.test1], [v0.3.5][io-wait-v0.3.5], [v0.3.6][io-wait-v0.3.6], [v0.4.0][io-wait-v0.4.0] * ipaddr 1.2.8 * json 2.18.0 * 2.9.1 to [v2.10.0][json-v2.10.0], [v2.10.1][json-v2.10.1], [v2.10.2][json-v2.10.2], [v2.11.0][json-v2.11.0], [v2.11.1][json-v2.11.1], [v2.11.2][json-v2.11.2], [v2.11.3][json-v2.11.3], [v2.12.0][json-v2.12.0], [v2.12.1][json-v2.12.1], [v2.12.2][json-v2.12.2], [v2.13.0][json-v2.13.0], [v2.13.1][json-v2.13.1], [v2.13.2][json-v2.13.2], [v2.14.0][json-v2.14.0], [v2.14.1][json-v2.14.1], [v2.15.0][json-v2.15.0], [v2.15.1][json-v2.15.1], [v2.15.2][json-v2.15.2], [v2.16.0][json-v2.16.0], [v2.17.0][json-v2.17.0], [v2.17.1][json-v2.17.1], [v2.18.0][json-v2.18.0] * net-http 0.9.1 * 0.6.0 to [v0.7.0][net-http-v0.7.0], [v0.8.0][net-http-v0.8.0], [v0.9.0][net-http-v0.9.0], [v0.9.1][net-http-v0.9.1] * openssl 4.0.0 * 3.3.1 to [v3.3.2][openssl-v3.3.2], [v4.0.0][openssl-v4.0.0] * optparse 0.8.1 * 0.6.0 to [v0.7.0][optparse-v0.7.0], [v0.8.0][optparse-v0.8.0], [v0.8.1][optparse-v0.8.1] * pp 0.6.3 * 0.6.2 to [v0.6.3][pp-v0.6.3] * prism 1.7.0 * 1.5.2 to [v1.6.0][prism-v1.6.0], [v1.7.0][prism-v1.7.0] * psych 5.3.1 * 5.2.2 to [v5.2.3][psych-v5.2.3], [v5.2.4][psych-v5.2.4], [v5.2.5][psych-v5.2.5], [v5.2.6][psych-v5.2.6], [v5.3.0][psych-v5.3.0], [v5.3.1][psych-v5.3.1] * resolv 0.7.0 * 0.6.2 to [v0.6.3][resolv-v0.6.3], [v0.7.0][resolv-v0.7.0] * stringio 3.2.0 * 3.1.2 to [v3.1.3][stringio-v3.1.3], [v3.1.4][stringio-v3.1.4], [v3.1.5][stringio-v3.1.5], [v3.1.6][stringio-v3.1.6], [v3.1.7][stringio-v3.1.7], [v3.1.8][stringio-v3.1.8], [v3.1.9][stringio-v3.1.9], [v3.2.0][stringio-v3.2.0] * strscan 3.1.6 * 3.1.2 to [v3.1.3][strscan-v3.1.3], [v3.1.4][strscan-v3.1.4], [v3.1.5][strscan-v3.1.5], [v3.1.6][strscan-v3.1.6] * time 0.4.2 * 0.4.1 to [v0.4.2][time-v0.4.2] * timeout 0.6.0 * 0.4.3 to [v0.4.4][timeout-v0.4.4], [v0.5.0][timeout-v0.5.0], [v0.6.0][timeout-v0.6.0] * uri 1.1.1 * 1.0.4 to [v1.1.0][uri-v1.1.0], [v1.1.1][uri-v1.1.1] * weakref 0.1.4 * 0.1.3 to [v0.1.4][weakref-v0.1.4] * zlib 3.2.2 * 3.2.1 to [v3.2.2][zlib-v3.2.2] The following bundled gems are updated. * minitest 6.0.0 * power_assert 3.0.1 * 2.0.5 to [v3.0.0][power_assert-v3.0.0], [v3.0.1][power_assert-v3.0.1] * rake 13.3.1 * 13.2.1 to [v13.3.0][rake-v13.3.0], [v13.3.1][rake-v13.3.1] * test-unit 3.7.3 * 3.6.7 to [3.6.8][test-unit-3.6.8], [3.6.9][test-unit-3.6.9], [3.7.0][test-unit-3.7.0], [3.7.1][test-unit-3.7.1], [3.7.2][test-unit-3.7.2], [3.7.3][test-unit-3.7.3], [3.7.4][test-unit-3.7.4], [3.7.5][test-unit-3.7.5] * rexml 3.4.4 * rss 0.3.2 * 0.3.1 to [0.3.2][rss-0.3.2] * net-ftp 0.3.9 * 0.3.8 to [v0.3.9][net-ftp-v0.3.9] * net-imap 0.6.2 * 0.5.8 to [v0.5.9][net-imap-v0.5.9], [v0.5.10][net-imap-v0.5.10], [v0.5.11][net-imap-v0.5.11], [v0.5.12][net-imap-v0.5.12], [v0.5.13][net-imap-v0.5.13], [v0.6.0][net-imap-v0.6.0], [v0.6.1][net-imap-v0.6.1], [v0.6.2][net-imap-v0.6.2] * net-smtp 0.5.1 * 0.5.0 to [v0.5.1][net-smtp-v0.5.1] * matrix 0.4.3 * 0.4.2 to [v0.4.3][matrix-v0.4.3] * prime 0.1.4 * 0.1.3 to [v0.1.4][prime-v0.1.4] * rbs 3.10.0 * 3.8.0 to [v3.8.1][rbs-v3.8.1], [v3.9.0.dev.1][rbs-v3.9.0.dev.1], [v3.9.0.pre.1][rbs-v3.9.0.pre.1], [v3.9.0.pre.2][rbs-v3.9.0.pre.2], [v3.9.0][rbs-v3.9.0], [v3.9.1][rbs-v3.9.1], [v3.9.2][rbs-v3.9.2], [v3.9.3][rbs-v3.9.3], [v3.9.4][rbs-v3.9.4], [v3.9.5][rbs-v3.9.5], [v3.10.0.pre.1][rbs-v3.10.0.pre.1], [v3.10.0.pre.2][rbs-v3.10.0.pre.2], [v3.10.0][rbs-v3.10.0] * typeprof 0.31.1 * debug 1.11.1 * 1.11.0 to [v1.11.1][debug-v1.11.1] * base64 0.3.0 * 0.2.0 to [v0.3.0][base64-v0.3.0] * bigdecimal 4.0.1 * 3.1.8 to [v3.2.0][bigdecimal-v3.2.0], [v3.2.1][bigdecimal-v3.2.1], [v3.2.2][bigdecimal-v3.2.2], [v3.2.3][bigdecimal-v3.2.3], [v3.3.0][bigdecimal-v3.3.0], [v3.3.1][bigdecimal-v3.3.1], [v4.0.0][bigdecimal-v4.0.0], [v4.0.1][bigdecimal-v4.0.1] * drb 2.2.3 * 2.2.1 to [v2.2.3][drb-v2.2.3] * syslog 0.3.0 * 0.2.0 to [v0.3.0][syslog-v0.3.0] * csv 3.3.5 * 3.3.2 to [v3.3.3][csv-v3.3.3], [v3.3.4][csv-v3.3.4], [v3.3.5][csv-v3.3.5] * repl_type_completor 0.1.12 ### RubyGems and Bundler Ruby 4.0 bundled RubyGems and Bundler version 4. see the following links for details. * [Upgrading to RubyGems/Bundler 4 - RubyGems Blog](https://blog.rubygems.org/2025/12/03/upgrade-to-rubygems-bundler-4.ht… * [4.0.0 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/03/4.0.0-released.html) * [4.0.1 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/09/4.0.1-released.html) * [4.0.2 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/17/4.0.2-released.html) * [4.0.3 Released - RubyGems Blog](https://blog.rubygems.org/2025/12/23/4.0.3-released.html) ## Supported platforms * Windows * Dropped support for MSVC versions older than 14.0 (_MSC_VER 1900). This means Visual Studio 2015 or later is now required. ## Compatibility issues * The following methods were removed from Ractor due to the addition of `Ractor::Port`: * `Ractor.yield` * `Ractor#take` * `Ractor#close_incoming` * `Ractor#close_outgoing` [[Feature #21262]] * `ObjectSpace._id2ref` is deprecated. [[Feature #15408]] * `Process::Status#&` and `Process::Status#>>` have been removed. They were deprecated in Ruby 3.3. [[Bug #19868]] * `rb_path_check` has been removed. This function was used for `$SAFE` path checking which was removed in Ruby 2.7, and was already deprecated. [[Feature #20971]] * A backtrace for `ArgumentError` of "wrong number of arguments" now include the receiver's class or module name (e.g., in `Foo#bar` instead of in `bar`). [[Bug #21698]] * Backtraces no longer display `internal` frames. These methods now appear as if it is in the Ruby source file, consistent with other C-implemented methods. [[Bug #20968]] Before: ``` ruby -e '[1].fetch_values(42)' <internal:array>:211:in 'Array#fetch': index 42 outside of array bounds: -1...1 (IndexError) from <internal:array>:211:in 'block in Array#fetch_values' from <internal:array>:211:in 'Array#map!' from <internal:array>:211:in 'Array#fetch_values' from -e:1:in '<main>' ``` After: ``` $ ruby -e '[1].fetch_values(42)' -e:1:in 'Array#fetch_values': index 42 outside of array bounds: -1...1 (IndexError) from -e:1:in '<main>' ``` ## Stdlib compatibility issues * CGI library is removed from the default gems. Now we only provide `cgi/escape` for the following methods: * `CGI.escape` and `CGI.unescape` * `CGI.escapeHTML` and `CGI.unescapeHTML` * `CGI.escapeURIComponent` and `CGI.unescapeURIComponent` * `CGI.escapeElement` and `CGI.unescapeElement` [[Feature #21258]] * With the move of `Set` from stdlib to core class, `set/sorted_set.rb` has been removed, and `SortedSet` is no longer an autoloaded constant. Please install the `sorted_set` gem and `require 'sorted_set'` to use `SortedSet`. [[Feature #21287]] * Net::HTTP * The default behavior of automatically setting the `Content-Type` header to `application/x-www-form-urlencoded` for requests with a body (e.g., `POST`, `PUT`) when the header was not explicitly set has been removed. If your application relied on this automatic default, your requests will now be sent without a Content-Type header, potentially breaking compatibility with certain servers. [[GH-net-http #205]] ## C API updates * IO * `rb_thread_fd_close` is deprecated and now a no-op. If you need to expose file descriptors from C extensions to Ruby code, create an `IO` instance using `RUBY_IO_MODE_EXTERNAL` and use `rb_io_close(io)` to close it (this also interrupts and waits for all pending operations on the `IO` instance). Directly closing file descriptors does not interrupt pending operations, and may lead to undefined behaviour. In other words, if two `IO` objects share the same file descriptor, closing one does not affect the other. [[Feature #18455]] * GVL * `rb_thread_call_with_gvl` now works with or without the GVL. This allows gems to avoid checking `ruby_thread_has_gvl_p`. Please still be diligent about the GVL. [[Feature #20750]] * Set * A C API for `Set` has been added. The following methods are supported: [[Feature #21459]] * `rb_set_foreach` * `rb_set_new` * `rb_set_new_capa` * `rb_set_lookup` * `rb_set_add` * `rb_set_clear` * `rb_set_delete` * `rb_set_size` ## Implementation improvements * `Class#new` (ex. `Object.new`) is faster in all cases, but especially when passing keyword arguments. This has also been integrated into YJIT and ZJIT. [[Feature #21254]] * GC heaps of different size pools now grow independently, reducing memory usage when only some pools contain long-lived objects * GC sweeping is faster on pages of large objects * "Generic ivar" objects (String, Array, `TypedData`, etc.) now use a new internal "fields" object for faster instance variable access * The GC avoids maintaining an internal `id2ref` table until it is first used, making `object_id` allocation and GC sweeping faster * `object_id` and `hash` are faster on Class and Module objects * Larger bignum Integers can remain embedded using variable width allocation * `Random`, `Enumerator::Product`, `Enumerator::Chain`, `Addrinfo`, `StringScanner`, and some internal objects are now write-barrier protected, which reduces GC overhead. ### Ractor A lot of work has gone into making Ractors more stable, performant, and usable. These improvements bring Ractor implementation closer to leaving experimental status. * Performance improvements * Frozen strings and the symbol table internally use a lock-free hash set [[Feature #21268]] * Method cache lookups avoid locking in most cases * Class (and generic ivar) instance variable access is faster and avoids locking * CPU cache contention is avoided in object allocation by using a per-ractor counter * CPU cache contention is avoided in xmalloc/xfree by using a thread-local counter * `object_id` avoids locking in most cases * Bug fixes and stability * Fixed possible deadlocks when combining Ractors and Threads * Fixed issues with require and autoload in a Ractor * Fixed encoding/transcoding issues across Ractors * Fixed race conditions in GC operations and method invalidation * Fixed issues with processes forking after starting a Ractor * GC allocation counts are now accurate under Ractors * Fixed TracePoints not working after GC [[Bug #19112]] ## JIT * ZJIT * Introduce an [experimental method-based JIT compiler](https://docs.ruby-lang.org/en/master/jit/zjit_md.html). Where available, ZJIT can be enabled at runtime with the `--zjit` option or by calling `RubyVM::ZJIT.enable`. When building Ruby, Rust 1.85.0 or later is required to include ZJIT support. * As of Ruby 4.0.0, ZJIT is faster than the interpreter, but not yet as fast as YJIT. We encourage experimentation with ZJIT, but advise against deploying it in production for now. * Our goal is to make ZJIT faster than YJIT and production-ready in Ruby 4.1. * YJIT * `RubyVM::YJIT.runtime_stats` * `ratio_in_yjit` no longer works in the default build. Use `--enable-yjit=stats` on `configure` to enable it on `--yjit-stats`. * Add `invalidate_everything` to default stats, which is incremented when every code is invalidated by TracePoint. * Add `mem_size:` and `call_threshold:` options to `RubyVM::YJIT.enable`. * RJIT * `--rjit` is removed. We will move the implementation of the third-party JIT API to the [ruby/rjit](https://github.com/ruby/rjit) repository. See [NEWS](https://docs.ruby-lang.org/en/v4.0.0/NEWS_md.html) or [commit logs](https://github.com/ruby/ruby/compare/v3_4_0...v4.0.0) for more details. With those changes, [3889 files changed, 230769 insertions(+), 297003 deletions(-)](https://github.com/ruby/ruby/compare/v3_4_0...v4.0.0#file_buc… since Ruby 3.4.0! Merry Christmas, a Happy New Year, and Happy Hacking with Ruby 4.0! ## Download * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.gz> SIZE: 23955109 SHA1: 754e39e9ad122e1b6deaed860350bac133a35ed3 SHA256: 2e8389c8c072cb658c93a1372732d9eac84082c88b065750db1e52a5ac630271 SHA512: 688254e939b197d564e896fb951bc1abf07142f489e91c5ed0b11f68f52d6adb6b1f86616fe03f1f0bb434beeef7e75e158b9c616afb39bb34403b0b78d2ee19 * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.xz> SIZE: 18008368 SHA1: 05ec670e86f84325c5353ef2f2888e53b6adc602 SHA256: a72bacee9de07283ebc19baa4ac243b193129f21aa4e168c7186fb1fe7d07fe1 SHA512: 2d5b2e566eaf70a5f3ea6ce6afc0611c0415de58a41336ef7a0b855c9a91eda9aa790a5f8b48e40a1eb9d50f8ea0f687216e617f16c8d040a08474f3116518a4 * <https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.zip> SIZE: 29253204 SHA1: 0b69f89d1d140157251c0d3a6032f6c45cdf81e8 SHA256: 70cb1bf89279b86ab9a975d504607c051fc05ee03e311d550a5541b65e373455 SHA512: a72e076ef618c0aeb9d20cf22e6fb12fda36809c0064ef0f98153b95a0bac257ef606342444a38f992c4594bf376a4d264686cf597463aa6f111220798784302 ## What is Ruby Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993, and is now developed as Open Source. It runs on multiple platforms and is used all over the world especially for web development. [Feature #15408]: https://bugs.ruby-lang.org/issues/15408 [Feature #17473]: https://bugs.ruby-lang.org/issues/17473 [Feature #18455]: https://bugs.ruby-lang.org/issues/18455 [Bug #19112]: https://bugs.ruby-lang.org/issues/19112 [Feature #19630]: https://bugs.ruby-lang.org/issues/19630 [Bug #19868]: https://bugs.ruby-lang.org/issues/19868 [Feature #19908]: https://bugs.ruby-lang.org/issues/19908 [Feature #20610]: https://bugs.ruby-lang.org/issues/20610 [Feature #20724]: https://bugs.ruby-lang.org/issues/20724 [Feature #20750]: https://bugs.ruby-lang.org/issues/20750 [Feature #20884]: https://bugs.ruby-lang.org/issues/20884 [Feature #20925]: https://bugs.ruby-lang.org/issues/20925 [Bug #20968]: https://bugs.ruby-lang.org/issues/20968 [Feature #20971]: https://bugs.ruby-lang.org/issues/20971 [Bug #20974]: https://bugs.ruby-lang.org/issues/20974 [Feature #21047]: https://bugs.ruby-lang.org/issues/21047 [Bug #21049]: https://bugs.ruby-lang.org/issues/21049 [Feature #21166]: https://bugs.ruby-lang.org/issues/21166 [Bug #21174]: https://bugs.ruby-lang.org/issues/21174 [Bug #21175]: https://bugs.ruby-lang.org/issues/21175 [Bug #21185]: https://bugs.ruby-lang.org/issues/21185 [Feature #21205]: https://bugs.ruby-lang.org/issues/21205 [Feature #21216]: https://bugs.ruby-lang.org/issues/21216 [Feature #21219]: https://bugs.ruby-lang.org/issues/21219 [Feature #21254]: https://bugs.ruby-lang.org/issues/21254 [Feature #21258]: https://bugs.ruby-lang.org/issues/21258 [Feature #21268]: https://bugs.ruby-lang.org/issues/21268 [Feature #21262]: https://bugs.ruby-lang.org/issues/21262 [Feature #21275]: https://bugs.ruby-lang.org/issues/21275 [Feature #21287]: https://bugs.ruby-lang.org/issues/21287 [Feature #21311]: https://bugs.ruby-lang.org/issues/21311 [Feature #21347]: https://bugs.ruby-lang.org/issues/21347 [Feature #21360]: https://bugs.ruby-lang.org/issues/21360 [Misc #21385]: https://bugs.ruby-lang.org/issues/21385 [Feature #21389]: 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[ruby-list:51034] [ANN]Rubyist Magazine 0065号リリース
by Keiko Kaneko 19 Dec '25

19 Dec '25

みなさんこんにちは。neko314＠るびま編集部です。日本 Ruby の会有志によるウェブ雑誌「Rubyist Magazine」通称『るびま』の 0065 号をリリースしましたのでお知らせします。今後とも Rubyist Magazine をご愛読いただけると幸いです。 0065号 (2025-12) https://magazine.rubyist.net/articles/0065/index.html * 巻頭言 * FirstStepRuby * RegionalRubyKaigi レポート (85) 福岡 Rubyist 会議 04 * RegionalRubyKaigi レポート (86) TokyuRuby 会議 15 レポート * RegionalRubyKaigi レポート (87) 松江 Ruby 会議 11 * 日報が面倒なので、Ruby と Google Gemini を使って生成するツールを作成しました * RegionalRubyKaigi レポート (88) 大阪 Ruby 会議 03 * RegionalRubyKaigi レポート (89) 大阪 Ruby 会議 04 * RegionalRubyKaigi レポート (88) 東京 Ruby 会議 12 * Kaigi on Rails 2024 開催レポート * RubyKaigi 2025 スピーカーからのメッセージ * Rails Girls Nagasaki 2nd 開催レポート * あなたもできる「超絶技巧 Ruby 意味不明コーディング」ことはじめ * Ruby リリース 30 周年に寄せて * RubyEventCheck * 0065 号編集後記

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