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+# 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.
+
+No maintainer means that there is no specific maintainer for the part now.
+The member of ruby core team can fix issues at anytime. But major changes need
+consensus on ruby-core/ruby-dev.
+
+### Language core features including security
+
+* Yukihiro Matsumoto ([matz])
+
+### Evaluator
+
+* Koichi Sasada ([ko1])
+
+### Core classes
+
+* Yukihiro Matsumoto ([matz])
+
+### Standard Library Maintainers
+
+#### lib/mkmf.rb
+
+* *No maintainer*
+
+#### pathname_builtin.rb, lib/pathname.rb
+
+* Tanaka Akira ([akr])
+
+#### lib/rubygems.rb, lib/rubygems/*
+
+* Hiroshi SHIBATA ([hsbt])
+* https://github.com/ruby/rubygems
+
+#### lib/unicode_normalize.rb, lib/unicode_normalize/*
+
+* Martin J. Dürst ([duerst])
+
+### Standard Library(Extensions) Maintainers
+
+#### set.c
+
+* Akinori MUSHA ([knu])
+
+#### ext/continuation
+
+* Koichi Sasada ([ko1])
+
+#### ext/coverage
+
+* Yusuke Endoh ([mame])
+
+#### ext/fiber
+
+* Koichi Sasada ([ko1])
+
+#### ext/monitor
+
+* Koichi Sasada ([ko1])
+
+#### ext/objspace
+
+* *No maintainer*
+
+#### ext/pathname
+
+* Tanaka Akira ([akr])
+
+#### ext/pty
+
+* *No maintainer*
+
+#### ext/ripper
+
+* *No maintainer*
+
+#### ext/socket
+
+* Tanaka Akira ([akr])
+* API change needs matz's approval
+
+#### ext/win32
+
+* NAKAMURA Usaku ([unak])
+
+### Default gems(Libraries) Maintainers
+
+#### lib/bundler.rb, lib/bundler/*
+
+* Hiroshi SHIBATA ([hsbt])
+* https://github.com/ruby/rubygems
+* https://rubygems.org/gems/bundler
+
+#### lib/cgi/escape.rb
+
+* *No maintainer*
+
+#### lib/English.rb
+
+* *No maintainer*
+* https://github.com/ruby/English
+* https://rubygems.org/gems/English
+
+#### lib/delegate.rb
+
+* *No maintainer*
+* 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
+
+* *No maintainer*
+* 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/optparse.rb, lib/optparse/*
+
+* Nobuyuki Nakada ([nobu])
+* https://github.com/ruby/optparse
+* https://rubygems.org/gems/optparse
+
+#### 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
+
+* *No maintainer*
+* https://github.com/ruby/net-protocol
+* https://rubygems.org/gems/net-protocol
+
+#### lib/open3.rb
+
+* *No maintainer*
+* https://github.com/ruby/open3
+* https://rubygems.org/gems/open3
+
+#### lib/open-uri.rb
+
+* Tanaka Akira ([akr])
+* https://github.com/ruby/open-uri
+* https://rubygems.org/gems/open-uri
+
+#### 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])
+* Earlopain ([earlopain])
+* https://github.com/ruby/prism
+* https://rubygems.org/gems/prism
+
+#### lib/resolv.rb
+
+* Tanaka Akira ([akr])
+* https://github.com/ruby/resolv
+* https://rubygems.org/gems/resolv
+
+#### lib/securerandom.rb
+
+* Tanaka Akira ([akr])
+* https://github.com/ruby/securerandom
+* https://rubygems.org/gems/securerandom
+
+#### 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
+
+* *No maintainer*
+* 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/tmpdir.rb
+
+* *No maintainer*
+* https://github.com/ruby/tmpdir
+* https://rubygems.org/gems/tmpdir
+
+#### 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
+
+* *No maintainer*
+* https://github.com/ruby/weakref
+* https://rubygems.org/gems/weakref
+
+### Default gems(Extensions) Maintainers
+
+#### ext/cgi
+
+* Nobuyoshi Nakada ([nobu])
+
+#### ext/date
+
+* *No maintainer*
+* https://github.com/ruby/date
+* https://rubygems.org/gems/date
+
+#### ext/etc
+
+* *No maintainer*
+* https://github.com/ruby/etc
+* https://rubygems.org/gems/etc
+
+#### ext/fcntl
+
+* *No maintainer*
+* https://github.com/ruby/fcntl
+* https://rubygems.org/gems/fcntl
+
+#### 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/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/zlib
+
+* NARUSE, Yui ([nurse])
+* https://github.com/ruby/zlib
+* https://rubygems.org/gems/zlib
+
+## Bundled gems upstream repositories and maintainers
+
+The maintanance policy of bundled gems is different from Module Maintainers above.
+Please check the policies for each repository.
+
+The ruby core team tries to maintain the repositories with no maintainers.
+It may needs to make consensus on ruby-core/ruby-dev before making major changes.
+
+### minitest
+
+* Ryan Davis ([zenspider])
+* https://github.com/minitest/minitest
+* https://rubygems.org/gems/minitest
+
+### power_assert
+
+* Tsujimoto Kenta ([k-tsj])
+* https://github.com/ruby/power_assert
+* https://rubygems.org/gems/power_assert
+
+### rake
+
+* Hiroshi SHIBATA ([hsbt])
+* https://github.com/ruby/rake
+* https://rubygems.org/gems/rake
+
+### test-unit
+
+* Kouhei Sutou ([kou])
+* https://github.com/test-unit/test-unit
+* https://rubygems.org/gems/test-unit
+
+### rexml
+
+* Kouhei Sutou ([kou])
+* https://github.com/ruby/rexml
+* https://rubygems.org/gems/rexml
+
+### rss
+
+* Kouhei Sutou ([kou])
+* https://github.com/ruby/rss
+* https://rubygems.org/gems/rss
+
+### net-imap
+
+* Nicholas A. Evans ([nevans])
+* https://github.com/ruby/net-imap
+* https://rubygems.org/gems/net-imap
+
+### net-smtp
+
+* TOMITA Masahiro ([tmtm])
+* https://github.com/ruby/net-smtp
+* https://rubygems.org/gems/net-smtp
+
+### matrix
+
+* Marc-André Lafortune ([marcandre])
+* https://github.com/ruby/matrix
+* https://rubygems.org/gems/matrix
+
+### prime
+
+* https://github.com/ruby/prime
+* https://rubygems.org/gems/prime
+
+### rbs
+
+* Soutaro Matsumoto ([soutaro])
+* https://github.com/ruby/rbs
+* https://rubygems.org/gems/rbs
+
+### typeprof
+
+* Yusuke Endoh ([mame])
+* https://github.com/ruby/typeprof
+* https://rubygems.org/gems/typeprof
+
+### debug
+
+* Koichi Sasada ([ko1])
+* https://github.com/ruby/debug
+* https://rubygems.org/gems/debug
+
+### racc
+
+* Yuichi Kaneko ([yui-knk])
+* https://github.com/ruby/racc
+* https://rubygems.org/gems/racc
+
+#### mutex_m
+
+* https://github.com/ruby/mutex_m
+* https://rubygems.org/gems/mutex_m
+
+#### getoptlong
+
+* https://github.com/ruby/getoptlong
+* https://rubygems.org/gems/getoptlong
+
+#### base64
+
+* Yusuke Endoh ([mame])
+* https://github.com/ruby/base64
+* https://rubygems.org/gems/base64
+
+#### bigdecimal
+
+* Kenta Murata ([mrkn])
+* https://github.com/ruby/bigdecimal
+* https://rubygems.org/gems/bigdecimal
+
+#### observer
+
+* https://github.com/ruby/observer
+* https://rubygems.org/gems/observer
+
+#### abbrev
+
+* Akinori MUSHA ([knu])
+* https://github.com/ruby/abbrev
+* https://rubygems.org/gems/abbrev
+
+#### resolv-replace
+
+* Akira TANAKA ([akr])
+* https://github.com/ruby/resolv-replace
+* https://rubygems.org/gems/resolv-replace
+
+#### rinda
+
+* Masatoshi SEKI ([seki])
+* https://github.com/ruby/rinda
+* https://rubygems.org/gems/rinda
+
+#### drb
+
+* Masatoshi SEKI ([seki])
+* https://github.com/ruby/drb
+* https://rubygems.org/gems/drb
+
+#### nkf
+
+* Naruse Yusuke ([nurse])
+* https://github.com/ruby/nkf
+* https://rubygems.org/gems/nkf
+
+#### syslog
+
+* Akinori Musha ([knu])
+* https://github.com/ruby/syslog
+* https://rubygems.org/gems/syslog
+
+#### csv
+
+* Kouhei Sutou ([kou])
+* https://github.com/ruby/csv
+* https://rubygems.org/gems/csv
+
+#### ostruct
+
+* Marc-André Lafortune ([marcandre])
+* https://github.com/ruby/ostruct
+* https://rubygems.org/gems/ostruct
+
+#### pstore
+
+* https://github.com/ruby/pstore
+* https://rubygems.org/gems/pstore
+
+#### benchmark
+
+* Benoit Daloze ([eregon])
+* https://github.com/ruby/benchmark
+* https://rubygems.org/gems/benchmark
+
+#### logger
+
+* Naotoshi Seo ([sonots])
+* https://github.com/ruby/logger
+* https://rubygems.org/gems/logger
+
+#### rdoc
+
+* Stan Lo ([st0012])
+* Nobuyoshi Nakada ([nobu])
+* https://github.com/ruby/rdoc
+* https://rubygems.org/gems/rdoc
+
+#### win32ole
+
+* Masaki Suketa ([suketa])
+* https://github.com/ruby/win32ole
+* https://rubygems.org/gems/win32ole
+
+#### irb
+
+* Tomoya Ishida ([tompng])
+* Stan Lo ([st0012])
+* Mari Imaizumi ([ima1zumi])
+* HASUMI Hitoshi ([hasumikin])
+* https://github.com/ruby/irb
+* https://rubygems.org/gems/irb
+
+#### reline
+
+* Tomoya Ishida ([tompng])
+* Stan Lo ([st0012])
+* Mari Imaizumi ([ima1zumi])
+* HASUMI Hitoshi ([hasumikin])
+* https://github.com/ruby/reline
+* https://rubygems.org/gems/reline
+
+#### readline
+
+* https://github.com/ruby/readline
+* https://rubygems.org/gems/readline
+
+#### fiddle
+
+* Kouhei Sutou ([kou])
+* https://github.com/ruby/fiddle
+* https://rubygems.org/gems/fiddle
+
+#### repl_type_completor
+
+* Tomoya Ishida ([tompng])
+* https://github.com/ruby/repl_type_completor
+* https://rubygems.org/gems/repl_type_completor
+
+#### tsort
+
+* Tanaka Akira ([akr])
+* https://github.com/ruby/tsort
+* https://rubygems.org/gems/tsort
+
+#### win32-registry
+
+* Nakamura Usaku ([unak])
+* https://github.com/ruby/win32-registry
+* https://rubygems.org/gems/win32-registry
+
+## 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, ...
+
+* **No maintainer**
+
+### 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
+[earlopain]: https://github.com/earlopain
+[eban]: https://github.com/eban
+[eileencodes]: https://github.com/eileencodes
+[eregon]: https://github.com/eregon
+[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
+[zenspider]: https://github.com/zenspider
+[k-tsj]: https://github.com/k-tsj
+[nevans]: https://github.com/nevans
+[tmtm]: https://github.com/tmtm
+[soutaro]: https://github.com/soutaro
+[yui-knk]: https://github.com/yui-knk
+[hasumikin]: https://github.com/hasumikin
+[suketa]: https://github.com/suketa