diff --git a/.gitignore b/.gitignore
index 30f1e5c..b69ecaa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,6 @@
 /_yardoc/
 /coverage/
 /doc/
-/lib/
 /logs/
 /pkg/
 /spec/reports/
diff --git a/Gemfile b/Gemfile
index 901188a..c38b903 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,8 +5,6 @@ gemspec
 
 group :development do
   gem "rake"
-  gem "rake-compiler"
   gem "test-unit"
   gem "test-unit-ruby-core"
-  gem 'ruby-maven', :platforms => :jruby
 end
diff --git a/README.md b/README.md
index a8f04f4..dca9f48 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 This gem provides the feature for waiting until IO is readable or writable without blocking.
 
+**Note:** This gem is empty and deprecated. All functionality was moved into core Ruby as of version 3.2.
+
 ## Installation
 
 Add this line to your application's Gemfile:
diff --git a/Rakefile b/Rakefile
index f5a711b..12996aa 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,37 +1,11 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
 
-name = "io/wait"
-
-case
-when RUBY_ENGINE == "jruby"
-  require 'rake/javaextensiontask'
-  Rake::JavaExtensionTask.new("wait") do |ext|
-    require 'maven/ruby/maven'
-    ext.source_version = '1.8'
-    ext.target_version = '1.8'
-    ext.ext_dir = 'ext/java'
-    ext.lib_dir = 'lib/io'
-  end
-  task "build" => "lib/io/wait.jar"
-  task "lib/io/wait.jar" => "compile"
-  libs = ["ext/java/lib", "lib"]
-else
-  require 'rake/extensiontask'
-  extask = Rake::ExtensionTask.new(name) do |x|
-    x.lib_dir.sub!(%r[(?=/|\z)], "/#{RUBY_VERSION}/#{x.platform}")
-  end
-  libs = ["lib/#{RUBY_VERSION}/#{extask.platform}"]
-end
-
 Rake::TestTask.new(:test) do |t|
-  t.libs = libs
-  t.libs << "test/lib"
+  t.libs = ["lib", "test/lib"]
   t.ruby_opts << "-rhelper"
   t.options = "--ignore-name=/ungetc_in_text/"
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
-task :test => :compile
-
 task :default => :test
diff --git a/ext/io/wait/depend b/ext/io/wait/depend
deleted file mode 100644
index bbf1266..0000000
--- a/ext/io/wait/depend
+++ /dev/null
@@ -1,18 +0,0 @@
-# AUTOGENERATED DEPENDENCIES START
-wait.o: $(RUBY_EXTCONF_H)
-wait.o: $(arch_hdrdir)/ruby/config.h
-wait.o: $(hdrdir)/ruby.h
-wait.o: $(hdrdir)/ruby/assert.h
-wait.o: $(hdrdir)/ruby/backward.h
-wait.o: $(hdrdir)/ruby/defines.h
-wait.o: $(hdrdir)/ruby/encoding.h
-wait.o: $(hdrdir)/ruby/intern.h
-wait.o: $(hdrdir)/ruby/io.h
-wait.o: $(hdrdir)/ruby/missing.h
-wait.o: $(hdrdir)/ruby/onigmo.h
-wait.o: $(hdrdir)/ruby/oniguruma.h
-wait.o: $(hdrdir)/ruby/ruby.h
-wait.o: $(hdrdir)/ruby/st.h
-wait.o: $(hdrdir)/ruby/subst.h
-wait.o: wait.c
-# AUTOGENERATED DEPENDENCIES END
diff --git a/ext/io/wait/extconf.rb b/ext/io/wait/extconf.rb
deleted file mode 100644
index 00c455a..0000000
--- a/ext/io/wait/extconf.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# frozen_string_literal: false
-require 'mkmf'
-
-create_makefile("io/wait")
diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
deleted file mode 100644
index f757519..0000000
--- a/ext/io/wait/wait.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* -*- c-file-style: "ruby"; indent-tabs-mode: t -*- */
-/**********************************************************************
-
-  io/wait.c -
-
-  $Author$
-  created at: Tue Aug 28 09:08:06 JST 2001
-
-  All the files in this distribution are covered under the Ruby's
-  license (see the file COPYING).
-
-**********************************************************************/
-
-#include "ruby.h"		/* abi_version */
-
-/*
- * IO wait methods are built in ruby now, just for backward compatibility.
- */
-
-void
-Init_wait(void)
-{
-}
diff --git a/ext/java/lib/io/wait.rb b/ext/java/lib/io/wait.rb
deleted file mode 100644
index de3ae75..0000000
--- a/ext/java/lib/io/wait.rb
+++ /dev/null
@@ -1,2 +0,0 @@
-require 'io/wait.jar'
-JRuby::Util.load_ext("org.jruby.ext.io.wait.IOWaitLibrary")
diff --git a/ext/java/org/jruby/ext/io/wait/IOWaitLibrary.java b/ext/java/org/jruby/ext/io/wait/IOWaitLibrary.java
deleted file mode 100644
index 14ef2b5..0000000
--- a/ext/java/org/jruby/ext/io/wait/IOWaitLibrary.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/***** BEGIN LICENSE BLOCK *****
- * Version: EPL 2.0/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Eclipse Public
- * License Version 2.0 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.eclipse.org/legal/epl-v20.html
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * Copyright (C) 2006 Nick Sieger <nicksieger@gmail.com>
- * 
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the EPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the EPL, the GPL or the LGPL.
- ***** END LICENSE BLOCK *****/
-
-package org.jruby.ext.io.wait;
-
-import org.jruby.Ruby;
-import org.jruby.runtime.load.Library;
-
-/**
- * IO wait methods are built in JRuby now, just for backward compatibility.
- *
- * @author Nick Sieger
- */
-public class IOWaitLibrary implements Library {
-
-    public void load(Ruby runtime, boolean wrap) {
-    }
-}
diff --git a/io-wait.gemspec b/io-wait.gemspec
index c1c6172..3ba8a0b 100644
--- a/io-wait.gemspec
+++ b/io-wait.gemspec
@@ -6,8 +6,8 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Nobu Nakada", "Charles Oliver Nutter"]
   spec.email         = ["nobu@ruby-lang.org", "headius@headius.com"]
 
-  spec.summary       = %q{Waits until IO is readable or writable without blocking.}
-  spec.description   = %q{Waits until IO is readable or writable without blocking.}
+  spec.summary       = %q{Deprecated: All functionality ships with Ruby 3.2 and higher.}
+  spec.description   = %q{Deprecated: All functionality ships with Ruby 3.2 and higher.}
   spec.homepage      = "https://github.com/ruby/io-wait"
   spec.licenses      = ["Ruby", "BSD-2-Clause"]
   spec.required_ruby_version = Gem::Requirement.new(">= 3.2")
@@ -15,11 +15,9 @@ Gem::Specification.new do |spec|
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
 
-  jruby = true if Gem::Platform.new('java') =~ spec.platform or RUBY_ENGINE == 'jruby'
   dir, gemspec = File.split(__FILE__)
   excludes = [
-    *%w[:^/.git* :^/Gemfile* :^/Rakefile* :^/bin/ :^/test/ :^/rakelib/ :^*.java],
-    *(jruby ? %w[:^/ext/io] : %w[:^/ext/java]),
+    *%w[:^/.git* :^/Gemfile* :^/Rakefile* :^/bin/ :^/test/ :^/rakelib/],
     ":(exclude,literal,top)#{gemspec}"
   ]
   files = IO.popen(%w[git ls-files -z --] + excludes, chdir: dir, &:read).split("\x0")
@@ -28,12 +26,4 @@ Gem::Specification.new do |spec|
   spec.bindir        = "exe"
   spec.executables   = []
   spec.require_paths = ["lib"]
-
-  if jruby
-    spec.platform = 'java'
-    spec.files << "lib/io/wait.jar"
-    spec.require_paths += ["ext/java/lib"]
-  else
-    spec.extensions    = %w[ext/io/wait/extconf.rb]
-  end
 end
diff --git a/lib/io/wait.rb b/lib/io/wait.rb
new file mode 100644
index 0000000..eab059d
--- /dev/null
+++ b/lib/io/wait.rb
@@ -0,0 +1 @@
+warn "The io-wait gem is deprecated; all functionality ships with Ruby 3.2 and higher."