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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.
+
+### 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
+
+### 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 (usa)
+
+## 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 (ktsj)
+* 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 (naruse)
+* 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)
+* Jemma Issroff (jemmaissroff)
+* 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)
+* 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 (naruse)
+* 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 (naruse)
+* Hiroshi SHIBATA (hsbt)
+* https://github.com/flori/json
+* https://rubygems.org/gems/json
+
+#### ext/openssl
+* Kazuki Yamaguchi (rhe)
+* 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 (suke)
+* https://github.com/ruby/win32ole
+* https://rubygems.org/gems/win32ole
+
+#### ext/zlib
+* NARUSE, Yui (naruse)
+* 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 (usa)
+
+### 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 (jeremyevans0)
+
+### cygwin, ...
+* none. (Maintainer WANTED)
+
+### WebAssembly/WASI
+* Yuta Saito (katei)