diff --git a/doc/maintainers.rdoc b/doc/maintainers.rdoc
index f486729f26..1f32b2dd6e 100644
--- a/doc/maintainers.rdoc
+++ b/doc/maintainers.rdoc
@@ -99,8 +99,6 @@ Zachary Scott (zzak)
   WATANABE Hirofumi (eban)
 [lib/unicode_normalize.rb, lib/unicode_normalize/*]
   Martin J. Dürst
-[lib/uri.rb, lib/uri/*]
-  YAMADA, Akira (akira)
 [lib/weakref.rb]
   _unmaintained_
 
@@ -263,6 +261,9 @@ Zachary Scott (zzak)
 [lib/tracer.rb]
   Keiju ISHITSUKA (keiju)
   https://github.com/ruby/tracer
+[lib/uri.rb, lib/uri/*]
+  YAMADA, Akira (akira)
+  https://github.com/ruby/uri
 [lib/webrick.rb, lib/webrick/*]
   Eric Wong (normalperson)
   https://bugs.ruby-lang.org/
diff --git a/doc/standard_library.rdoc b/doc/standard_library.rdoc
index 4927ea1be8..b8b445acf0 100644
--- a/doc/standard_library.rdoc
+++ b/doc/standard_library.rdoc
@@ -37,7 +37,6 @@ Time:: Extends the Time class with methods for parsing and conversion
 tmpdir.rb:: Extends the Dir class to manage the OS temporary file path
 TSort:: Topological sorting using Tarjan's algorithm
 un.rb:: Utilities to replace common UNIX commands
-URI:: A Ruby module providing support for Uniform Resource Identifiers
 WeakRef:: Allows a referenced object to be garbage-collected
 
 == Extensions
@@ -86,6 +85,7 @@ RSS:: Family of libraries that support various formats of XML "feeds"
 Singleton:: Implementation of the Singleton pattern for Ruby
 Timeout:: Auto-terminate potentially long-running operations in Ruby
 Tracer:: Outputs a source level execution trace of a Ruby program
+URI:: A Ruby module providing support for Uniform Resource Identifiers
 WEBrick:: An HTTP server toolkit for Ruby
 YAML:: Ruby client library for the Psych YAML implementation
 
diff --git a/lib/uri.rb b/lib/uri.rb
index 9b6bde91c0..ea8ea3e18c 100644
--- a/lib/uri.rb
+++ b/lib/uri.rb
@@ -90,13 +90,9 @@
 #
 
 module URI
-  # :stopdoc:
-  VERSION_CODE = '001000'.freeze
-  VERSION = VERSION_CODE.scan(/../).collect{|n| n.to_i}.join('.').freeze
-  # :startdoc:
-
 end
 
+require 'uri/version'
 require 'uri/common'
 require 'uri/generic'
 require 'uri/file'
diff --git a/lib/uri/uri.gemspec b/lib/uri/uri.gemspec
new file mode 100644
index 0000000000..5c51721755
--- /dev/null
+++ b/lib/uri/uri.gemspec
@@ -0,0 +1,29 @@
+begin
+  require_relative "lib/uri/version"
+rescue LoadError # Fallback to load version file in ruby core repository
+  require_relative "version"
+end
+
+Gem::Specification.new do |spec|
+  spec.name          = "uri"
+  spec.version       = URI::VERSION
+  spec.authors       = ["Akira Yamada"]
+  spec.email         = ["akira@ruby-lang.org"]
+
+  spec.summary       = %q{URI is a module providing classes to handle Uniform Resource Identifiers}
+  spec.description   = spec.summary
+  spec.homepage      = "https://github.com/ruby/uri"
+  spec.license       = "BSD-2-Clause"
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+end
diff --git a/lib/uri/version.rb b/lib/uri/version.rb
new file mode 100644
index 0000000000..4f54113393
--- /dev/null
+++ b/lib/uri/version.rb
@@ -0,0 +1,6 @@
+module URI
+  # :stopdoc:
+  VERSION_CODE = '001000'.freeze
+  VERSION = VERSION_CODE.scan(/../).collect{|n| n.to_i}.join('.').freeze
+  # :startdoc:
+end
diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index edebeb330f..81e687d336 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -47,6 +47,7 @@
 # * https://github.com/ruby/observer
 # * https://github.com/ruby/timeout
 # * https://github.com/ruby/yaml
+# * https://github.com/ruby/uri
 #
 
 require 'fileutils'
@@ -101,6 +102,7 @@ $repositories = {
   observer: "ruby/observer",
   timeout: "ruby/timeout",
   yaml: "ruby/yaml",
+  uri: "ruby/uri",
 }
 
 def sync_default_gems(gem)