# Maintainers

This page describes the current branch, module, library, and extension maintainers of Ruby.

## Branch Maintainers

A branch maintainer is responsible for backporting commits into stable branches
and publishing Ruby patch releases.

[The list of current branch maintainers is available in the wiki](https://github.com/ruby/ruby/wiki/Release-Engineering).

## \Module Maintainers

A module maintainer is responsible for a certain part of Ruby.

* The maintainer fixes bugs of the part. Particularly, they should fix
  security vulnerabilities as soon as possible.
* They handle issues related the module on the Redmine or ML.
* They may be discharged by the 3 months rule [[ruby-core:25764]](https://blade.ruby-lang.org/ruby-core/25764).
* They have commit right to Ruby's repository to modify their part in the
  repository.
* They have "developer" role on the Redmine to modify issues.
* They have authority to decide the feature of their part. But they should
  always respect discussions on ruby-core/ruby-dev.

A submaintainer of a module is like a maintainer. But the submaintainer does
not have authority to change/add a feature on his/her part. They need
consensus on ruby-core/ruby-dev before changing/adding. Some of submaintainers
have commit right, others don't.

### Language core features including security

* Yukihiro Matsumoto ([matz])

### Evaluator

* Koichi Sasada ([ko1])

### Core classes

* Yukihiro Matsumoto ([matz])

## Standard Library Maintainers

### Libraries

#### lib/mkmf.rb

* *unmaintained*

#### lib/rubygems.rb, lib/rubygems/*

* Eric Hodel ([drbrain])
* Hiroshi SHIBATA ([hsbt])
* https://github.com/rubygems/rubygems

#### lib/unicode_normalize.rb, lib/unicode_normalize/*

* Martin J. Dürst ([duerst])

### Extensions

#### ext/continuation

* Koichi Sasada ([ko1])

#### ext/coverage

* Yusuke Endoh ([mame])

#### ext/fiber

* Koichi Sasada ([ko1])

#### ext/monitor

* Koichi Sasada ([ko1])

#### ext/objspace

* *unmaintained*

#### ext/pty

* *unmaintained*

#### ext/ripper

* *unmaintained*

#### ext/socket

* Tanaka Akira ([akr])
* API change needs matz's approval

#### ext/win32

* NAKAMURA Usaku ([unak])

## Default gems Maintainers

### Libraries

#### lib/benchmark.rb

* *unmaintained*
* https://github.com/ruby/benchmark
* https://rubygems.org/gems/benchmark

#### lib/bundler.rb, lib/bundler/*

* Hiroshi SHIBATA ([hsbt])
* https://github.com/rubygems/rubygems
* https://rubygems.org/gems/bundler

#### lib/cgi.rb, lib/cgi/*

* *unmaintained*
* https://github.com/ruby/cgi
* https://rubygems.org/gems/cgi

#### lib/English.rb

* *unmaintained*
* https://github.com/ruby/English
* https://rubygems.org/gems/English

#### lib/delegate.rb

* *unmaintained*
* https://github.com/ruby/delegate
* https://rubygems.org/gems/delegate

#### lib/did_you_mean.rb

* Yuki Nishijima ([yuki24])
* https://github.com/ruby/did_you_mean
* https://rubygems.org/gems/did_you_mean

#### ext/digest, ext/digest/*

* Akinori MUSHA ([knu])
* https://github.com/ruby/digest
* https://rubygems.org/gems/digest

#### lib/erb.rb

* Masatoshi SEKI ([seki])
* Takashi Kokubun ([k0kubun])
* https://github.com/ruby/erb
* https://rubygems.org/gems/erb

#### lib/error_highlight.rb, lib/error_highlight/*

* Yusuke Endoh ([mame])
* https://github.com/ruby/error_highlight
* https://rubygems.org/gems/error_highlight

#### lib/fileutils.rb

* *unmaintained*
* https://github.com/ruby/fileutils
* https://rubygems.org/gems/fileutils

#### lib/find.rb

* Kazuki Tsujimoto ([k-tsj])
* https://github.com/ruby/find
* https://rubygems.org/gems/find

#### lib/forwardable.rb

* Keiju ISHITSUKA ([keiju])
* https://github.com/ruby/forwardable
* https://rubygems.org/gems/forwardable

#### lib/ipaddr.rb

* Akinori MUSHA ([knu])
* https://github.com/ruby/ipaddr
* https://rubygems.org/gems/ipaddr

#### lib/irb.rb, lib/irb/*

* Stan Lo ([st0012])
* Tomoya Ishida ([tompng])
* Mari Imaizumi ([ima1zumi])
* Hitoshi Hasumi ([hasumikin])
* https://github.com/ruby/irb
* https://rubygems.org/gems/irb

#### lib/optparse.rb, lib/optparse/*

* Nobuyuki Nakada ([nobu])
* https://github.com/ruby/optparse

#### lib/logger.rb

* Naotoshi Seo ([sonots])
* https://github.com/ruby/logger
* https://rubygems.org/gems/logger

#### lib/net/http.rb, lib/net/https.rb

* NARUSE, Yui ([nurse])
* https://github.com/ruby/net-http
* https://rubygems.org/gems/net-http

#### lib/net/protocol.rb

* *unmaintained*
* https://github.com/ruby/net-protocol
* https://rubygems.org/gems/net-protocol

#### lib/open3.rb

* *unmaintained*
* https://github.com/ruby/open3
* https://rubygems.org/gems/open3

#### lib/open-uri.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/open-uri

#### lib/ostruct.rb

* Marc-André Lafortune ([marcandre])
* https://github.com/ruby/ostruct
* https://rubygems.org/gems/ostruct

#### lib/pp.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/pp
* https://rubygems.org/gems/pp

#### lib/prettyprint.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/prettyprint
* https://rubygems.org/gems/prettyprint

#### lib/prism.rb

* Kevin Newton ([kddnewton])
* Eileen Uchitelle ([eileencodes])
* Aaron Patterson ([tenderlove])
* https://github.com/ruby/prism
* https://rubygems.org/gems/prism

#### lib/pstore.rb

* *unmaintained*
* https://github.com/ruby/pstore
* https://rubygems.org/gems/pstore

#### lib/readline.rb

* aycabta
* https://github.com/ruby/readline
* https://rubygems.org/gems/readline

#### lib/resolv.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/resolv
* https://rubygems.org/gems/resolv

#### lib/rdoc.rb, lib/rdoc/*

* Eric Hodel ([drbrain])
* Hiroshi SHIBATA ([hsbt])
* Stan Lo ([st0012])
* Colby Swandale ([colby-swandale])
* https://github.com/ruby/rdoc
* https://rubygems.org/gems/rdoc

#### lib/reline.rb, lib/reline/*

* Tomoya Ishida ([tompng])
* Mari Imaizumi ([ima1zumi])
* Stan Lo ([st0012])
* Hitoshi Hasumi ([hasumikin])
* https://github.com/ruby/reline
* https://rubygems.org/gems/reline

#### lib/securerandom.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/securerandom
* https://rubygems.org/gems/securerandom

#### lib/set.rb

* Akinori MUSHA ([knu])
* https://github.com/ruby/set
* https://rubygems.org/gems/set

#### lib/shellwords.rb

* Akinori MUSHA ([knu])
* https://github.com/ruby/shellwords
* https://rubygems.org/gems/shellwords

#### lib/singleton.rb

* Yukihiro Matsumoto ([matz])
* https://github.com/ruby/singleton
* https://rubygems.org/gems/singleton

#### lib/tempfile.rb

* *unmaintained*
* https://github.com/ruby/tempfile
* https://rubygems.org/gems/tempfile

#### lib/time.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/time
* https://rubygems.org/gems/time

#### lib/timeout.rb

* Yukihiro Matsumoto ([matz])
* https://github.com/ruby/timeout
* https://rubygems.org/gems/timeout

#### lib/thwait.rb

* Keiju ISHITSUKA ([keiju])
* https://github.com/ruby/thwait
* https://rubygems.org/gems/thwait

#### lib/tmpdir.rb

* *unmaintained*
* https://github.com/ruby/tmpdir
* https://rubygems.org/gems/tmpdir

#### lib/tsort.rb

* Tanaka Akira ([akr])
* https://github.com/ruby/tsort
* https://rubygems.org/gems/tsort

#### lib/un.rb

* WATANABE Hirofumi ([eban])
* https://github.com/ruby/un
* https://rubygems.org/gems/un

#### lib/uri.rb, lib/uri/*

* NARUSE, Yui ([nurse])
* https://github.com/ruby/uri
* https://rubygems.org/gems/uri

#### lib/yaml.rb, lib/yaml/*

* Aaron Patterson ([tenderlove])
* Hiroshi SHIBATA ([hsbt])
* https://github.com/ruby/yaml
* https://rubygems.org/gems/yaml

#### lib/weakref.rb

* *unmaintained*
* https://github.com/ruby/weakref
* https://rubygems.org/gems/weakref

### Extensions

#### ext/cgi

* Nobuyoshi Nakada ([nobu])
* https://github.com/ruby/cgi
* https://rubygems.org/gems/cgi

#### ext/date

* *unmaintained*
* https://github.com/ruby/date
* https://rubygems.org/gems/date

#### ext/etc

* *unmaintained*
* https://github.com/ruby/etc
* https://rubygems.org/gems/etc

#### ext/fcntl

* *unmaintained*
* https://github.com/ruby/fcntl
* https://rubygems.org/gems/fcntl

#### ext/fiddle

* Aaron Patterson ([tenderlove])
* https://github.com/ruby/fiddle
* https://rubygems.org/gems/fiddle

#### ext/io/console

* Nobuyuki Nakada ([nobu])
* https://github.com/ruby/io-console
* https://rubygems.org/gems/io-console

#### ext/io/nonblock

* Nobuyuki Nakada ([nobu])
* https://github.com/ruby/io-nonblock
* https://rubygems.org/gems/io-nonblock

#### ext/io/wait

* Nobuyuki Nakada ([nobu])
* https://github.com/ruby/io-wait
* https://rubygems.org/gems/io-wait

#### ext/json

* NARUSE, Yui ([nurse])
* Hiroshi SHIBATA ([hsbt])
* Jean Boussier ([byroot])
* https://github.com/ruby/json
* https://rubygems.org/gems/json

#### ext/openssl

* Kazuki Yamaguchi ([rhenium])
* https://github.com/ruby/openssl
* https://rubygems.org/gems/openssl

#### ext/pathname

* Tanaka Akira ([akr])
* https://github.com/ruby/pathname
* https://rubygems.org/gems/pathname

#### ext/psych

* Aaron Patterson ([tenderlove])
* Hiroshi SHIBATA ([hsbt])
* https://github.com/ruby/psych
* https://rubygems.org/gems/psych

#### ext/stringio

* Nobuyuki Nakada ([nobu])
* https://github.com/ruby/stringio
* https://rubygems.org/gems/stringio

#### ext/strscan

* Kouhei Sutou ([kou])
* https://github.com/ruby/strscan
* https://rubygems.org/gems/strscan

#### ext/win32ole

* Masaki Suketa ([suketa])
* https://github.com/ruby/win32ole
* https://rubygems.org/gems/win32ole

#### ext/zlib

* NARUSE, Yui ([nurse])
* https://github.com/ruby/zlib
* https://rubygems.org/gems/zlib

## Bundled gems upstream repositories

### minitest

* https://github.com/minitest/minitest

### power_assert

* https://github.com/ruby/power_assert

### rake

* https://github.com/ruby/rake

### test-unit

* https://github.com/test-unit/test-unit

### rexml

* https://github.com/ruby/rexml

### rss

* https://github.com/ruby/rss

### net-ftp

* https://github.com/ruby/net-ftp

### net-imap

* https://github.com/ruby/net-imap

### net-pop

* https://github.com/ruby/net-pop

### net-smtp

* https://github.com/ruby/net-smtp

### matrix

* https://github.com/ruby/matrix

### prime

* https://github.com/ruby/prime

### rbs

* https://github.com/ruby/rbs

### typeprof

* https://github.com/ruby/typeprof

### debug

* https://github.com/ruby/debug

### racc

* https://github.com/ruby/racc

#### mutex_m

* https://github.com/ruby/mutex_m

#### getoptlong

* https://github.com/ruby/getoptlong

#### base64

* https://github.com/ruby/base64

#### bigdecimal

* https://github.com/ruby/bigdecimal

#### observer

* https://github.com/ruby/observer

#### abbrev

* https://github.com/ruby/abbrev

#### resolv-replace

* https://github.com/ruby/resolv-replace

#### rinda

* https://github.com/ruby/rinda

#### drb

* https://github.com/ruby/drb

#### nkf

* https://github.com/ruby/nkf

#### syslog

* https://github.com/ruby/syslog

#### csv

* https://github.com/ruby/csv

## Platform Maintainers

### mswin64 (Microsoft Windows)

* NAKAMURA Usaku ([unak])

### mingw32 (Minimalist GNU for Windows)

* Nobuyoshi Nakada ([nobu])

### AIX

* Yutaka Kanemoto ([kanemoto])

### FreeBSD

* Akinori MUSHA ([knu])

### Solaris

* Naohisa Goto ([ngoto])

### RHEL, CentOS

* KOSAKI Motohiro ([kosaki])

### macOS

* Kenta Murata ([mrkn])

### OpenBSD

* Jeremy Evans ([jeremyevans])

### cygwin, ...

* none. (Maintainer WANTED)

### WebAssembly/WASI

* Yuta Saito ([kateinoigakukun])

[akr]: https://github.com/akr
[byroot]: https://github.com/byroot
[colby-swandale]: https://github.com/colby-swandale
[drbrain]: https://github.com/drbrain
[duerst]: https://github.com/duerst
[eban]: https://github.com/eban
[eileencodes]: https://github.com/eileencodes
[hasumikin]: https://github.com/hasumikin
[hsbt]: https://github.com/hsbt
[ima1zumi]: https://github.com/ima1zumi
[jeremyevans]: https://github.com/jeremyevans
[k-tsj]: https://github.com/k-tsj
[k0kubun]: https://github.com/k0kubun
[kanemoto]: https://github.com/kanemoto
[kateinoigakukun]: https://github.com/kateinoigakukun
[kddnewton]: https://github.com/kddnewton
[keiju]: https://github.com/keiju
[knu]: https://github.com/knu
[ko1]: https://github.com/ko1
[kosaki]: https://github.com/kosaki
[kou]: https://github.com/kou
[mame]: https://github.com/mame
[marcandre]: https://github.com/marcandre
[matz]: https://github.com/matz
[mrkn]: https://github.com/mrkn
[ngoto]: https://github.com/ngoto
[nobu]: https://github.com/nobu
[nurse]: https://github.com/nurse
[rhenium]: https://github.com/rhenium
[seki]: https://github.com/seki
[suketa]: https://github.com/suketa
[sonots]: https://github.com/sonots
[st0012]: https://github.com/st0012
[tenderlove]: https://github.com/tenderlove
[tompng]: https://github.com/tompng
[unak]: https://github.com/unak
[yuki24]: https://github.com/yuki24