diff --git a/tools/README.md b/tools/README.md
index 2dbe65d14a..14a0594cd5 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -4,7 +4,6 @@ This is a collection of utilities used for Rails internal development.
 They aren't used by Rails apps directly.
 
   * `console` drops you in irb and loads local Rails repos
-  * `profile` profiles `Kernel#require` to help reduce startup time
   * `railspect` provides commands to run internal linters
   * `line_statistics` provides CodeTools module and LineStatistics class to count lines
   * `test` is loaded by every major component of Rails to simplify testing, for example:
diff --git a/tools/profile b/tools/profile
deleted file mode 100755
index d38ba1dd84..0000000000
--- a/tools/profile
+++ /dev/null
@@ -1,137 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-# Profile require calls giving information about the time and the files that are called
-# when loading the provided file.
-#
-# Example:
-#   tools/profile activesupport/lib/active_support.rb [ruby-prof mode] [ruby-prof printer]
-ENV["NO_RELOAD"] ||= "1"
-ENV["RAILS_ENV"] ||= "development"
-
-module CodeTools
-  class Profiler
-    Error = Class.new(StandardError)
-
-    attr_reader :path, :mode
-    def initialize(path, mode = nil)
-      assert_ruby_file_exists(path)
-      @path, @mode = path, mode
-      require "benchmark"
-    end
-
-    def profile_requires
-      GC.start
-      before_rss = `ps -o rss= -p #{Process.pid}`.to_i
-
-      if mode
-        require "ruby-prof"
-        RubyProf.measure_mode = RubyProf.const_get(mode.upcase)
-        RubyProf.start
-      else
-        Object.instance_eval { include RequireProfiler }
-      end
-
-      elapsed = Benchmark.realtime { require path }
-      results = RubyProf.stop if mode
-
-      GC.start
-      after_rss = `ps -o rss= -p #{Process.pid}`.to_i
-
-      if mode
-        if printer = ARGV.shift
-          puts "RubyProf outputting to stderr with printer #{printer}"
-          RubyProf.const_get("#{printer.to_s.classify}Printer").new(results).print($stdout)
-        elsif RubyProf.const_defined?(:CallStackPrinter)
-          filename = "#{File.basename(path, '.rb')}.#{mode}.html"
-          puts "RubyProf outputting to #{filename}"
-          File.open(filename, "w") do |out|
-            RubyProf::CallStackPrinter.new(results).print(out)
-          end
-        else
-          filename = "#{File.basename(path, '.rb')}.#{mode}.callgrind"
-          puts "RubyProf outputting to #{filename}"
-          File.open(filename, "w") do |out|
-            RubyProf::CallTreePrinter.new(results).print(out)
-          end
-        end
-      end
-
-      RequireProfiler.stats.each do |file, depth, sec|
-        if sec
-          puts "%8.1f ms  %s%s" % [sec * 1000, " " * depth, file]
-        else
-          puts "#{' ' * (13 + depth)}#{file}"
-        end
-      end
-      puts "%8.1f ms  %d KB RSS" % [elapsed * 1000, after_rss - before_rss]
-    end
-
-    private
-      def assert_ruby_file_exists(path)
-        fail Error.new("No such file") unless File.exist?(path)
-        fail Error.new("#{path} is a directory") if File.directory?(path)
-        ruby_extension = File.extname(path) == ".rb"
-        ruby_executable = File.open(path, "rb") { |f| f.readline } =~ [/\A#!.*ruby/]
-        fail Error.new("Not a ruby file") unless ruby_extension || ruby_executable
-      end
-
-      module RequireProfiler
-        private
-          def require(file, *args) RequireProfiler.profile(file) { super } end
-          def load(file, *args) RequireProfiler.profile(file) { super } end
-
-          @depth, @stats = 0, []
-          class << self
-            attr_accessor :depth
-            attr_accessor :stats
-
-            def profile(file)
-              stats << [file, depth]
-              self.depth += 1
-              result = nil
-              elapsed = Benchmark.realtime { result = yield }
-              self.depth -= 1
-              stats.pop if stats.last.first == file
-              stats << [file, depth, elapsed] if result
-              result
-            end
-          end
-      end
-  end
-end
-# ruby-prof printer name causes the third arg to be sent :classify
-#   which is probably overkill if you already know the name of the ruby-prof
-#   printer you want to use, e.g. Graph
-begin
-  require "active_support/inflector"
-  require "active_support/core_ext/string/inflections"
-rescue LoadError
-  STDERR.puts $!.message
-  class String
-    # File activesupport/lib/active_support/inflector/methods.rb, line 150
-    def classify
-      # strip out any leading schema name
-      camelize(sub(/.*\./, ""))
-    end
-    # File activesupport/lib/active_support/inflector/methods.rb, line 68
-    def camelize(uppercase_first_letter = true)
-      string = self
-      if uppercase_first_letter
-        string = string.sub(/^[a-z\d]*/) { |match| match.capitalize }
-      else
-        string = string.sub(/^(?:(?=\b|[A-Z_])|\w)/) { |match| match.downcase }
-      end
-      string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub("/", "::")
-    end
-  end
-end
-if $0 == __FILE__
-  if (filename = ARGV.shift)
-    path = File.expand_path(filename)
-    mode = ARGV.shift
-    CodeTools::Profiler.new(path, mode).profile_requires
-  else
-    STDERR.puts "No file path entered. Usage is tools/profile path/to/file.rb [ruby-prof mode] [ruby-prof printer]"
-  end
-end