diff --git a/doc/maintainers.rdoc b/doc/maintainers.rdoc
index 2f1cbe914e..81099817f2 100644
--- a/doc/maintainers.rdoc
+++ b/doc/maintainers.rdoc
@@ -68,8 +68,6 @@ Zachary Scott (zzak)
   Akinori MUSHA (knu)
 [lib/irb.rb, lib/irb/*]
   Keiju ISHITSUKA (keiju)
-[lib/logger.rb]
-  Naotoshi Seo (sonots)
 [lib/matrix.rb]
   Marc-Andre Lafortune (marcandre)
 [lib/mkmf.rb]
@@ -213,6 +211,8 @@ Zachary Scott (zzak)
 [lib/fileutils.rb]
   _unmaintained_
   https://github.com/ruby/fileutils
+[lib/logger.rb]
+  Naotoshi Seo (sonots)
 [lib/rdoc.rb, lib/rdoc/*]
   Eric Hodel (drbrain), Hiroshi SHIBATA (hsbt)
   https://github.com/ruby/rdoc
diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index db06110de0..6aaa32c761 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -24,7 +24,6 @@ Forwardable:: Provides delegation of specified methods to a designated object
 GetoptLong:: Parse command line options similar to the GNU C getopt_long()
 IPAddr:: Provides methods to manipulate IPv4 and IPv6 IP addresses
 IRB:: Interactive Ruby command-line tool for REPL (Read Eval Print Loop)
-Logger:: Provides a simple logging utility for outputting messages
 MakeMakefile:: Module used to generate a Makefile for C extensions
 Matrix:: Represents a mathematical matrix.
 Monitor:: Provides an object or module to use safely by more than one thread
@@ -93,6 +92,7 @@ Bundler:: Manage your Ruby application's gem dependencies
 CMath:: Provides Trigonometric and Transcendental functions for complex numbers
 CSV:: Provides an interface to read and write CSV files and data
 FileUtils:: Several file utility methods for copying, moving, removing, etc
+Logger:: Provides a simple logging utility for outputting messages
 RDoc:: Produces HTML and command-line documentation for Ruby
 REXML:: An XML toolkit for Ruby
 RSS:: Family of libraries that support various formats of XML "feeds"
diff --git a/lib/logger.gemspec b/lib/logger.gemspec
new file mode 100644
index 0000000000..690817a2e2
--- /dev/null
+++ b/lib/logger.gemspec
@@ -0,0 +1,22 @@
+require_relative "logger"
+
+Gem::Specification.new do |spec|
+  spec.name          = "logger"
+  spec.version       = Logger::VERSION
+  spec.authors       = ["SHIBATA Hiroshi"]
+  spec.email         = ["hsbt@ruby-lang.org"]
+
+  spec.summary       = %q{Provides a simple logging utility for outputting messages.}
+  spec.description   = %q{Provides a simple logging utility for outputting messages.}
+  spec.homepage      = "https://github.com/ruby/logger"
+  spec.license       = "BSD-2-Clause"
+
+  spec.files         = [".gitignore", ".travis.yml", "Gemfile", "LICENSE.txt", "README.md", "Rakefile", "bin/console", "bin/setup", "lib/logger.rb", "logger.gemspec"]
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.16"
+  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "minitest", "~> 5.0"
+end