diff --git a/Gemfile b/Gemfile
index ee27f231370..e82b4c2b27a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -30,7 +30,7 @@ gem 'dalli', '>= 2.2.1'
 
 # Add your own local bundler stuff
 local_gemfile = File.dirname(__FILE__) + "/.Gemfile"
-instance_eval File.read local_gemfile if File.exists? local_gemfile
+instance_eval File.read local_gemfile if File.exist? local_gemfile
 
 group :test do
   platforms :mri_19 do
diff --git a/activerecord/test/cases/tasks/postgresql_rake_test.rb b/activerecord/test/cases/tasks/postgresql_rake_test.rb
index 90dac6399d9..6ea225178f1 100644
--- a/activerecord/test/cases/tasks/postgresql_rake_test.rb
+++ b/activerecord/test/cases/tasks/postgresql_rake_test.rb
@@ -206,7 +206,7 @@ module ActiveRecord
       @connection.expects(:schema_search_path).returns("foo")
 
       ActiveRecord::Tasks::DatabaseTasks.structure_dump(@configuration, filename)
-      assert File.exists?(filename)
+      assert File.exist?(filename)
     ensure
       FileUtils.rm(filename)
     end
diff --git a/railties/bin/rails b/railties/bin/rails
index b3026e8a93e..c11d65a08e0 100755
--- a/railties/bin/rails
+++ b/railties/bin/rails
@@ -2,7 +2,7 @@
 
 git_path = File.join(File.expand_path('../../..', __FILE__), '.git')
 
-if File.exists?(git_path)
+if File.exist?(git_path)
   railties_path = File.expand_path('../../lib', __FILE__)
   $:.unshift(railties_path)
 end
diff --git a/railties/lib/rails/app_rails_loader.rb b/railties/lib/rails/app_rails_loader.rb
index 71fcf83dae7..16107518446 100644
--- a/railties/lib/rails/app_rails_loader.rb
+++ b/railties/lib/rails/app_rails_loader.rb
@@ -55,7 +55,7 @@ EOS
     end
 
     def self.find_executable
-      EXECUTABLES.find { |exe| File.exists?(exe) }
+      EXECUTABLES.find { |exe| File.exist?(exe) }
     end
   end
 end
diff --git a/railties/lib/rails/commands/commands_tasks.rb b/railties/lib/rails/commands/commands_tasks.rb
index 59d2a0793e6..de604237842 100644
--- a/railties/lib/rails/commands/commands_tasks.rb
+++ b/railties/lib/rails/commands/commands_tasks.rb
@@ -139,7 +139,7 @@ EOT
       # This allows us to run `rails server` from other directories, but still get
       # the main config.ru and properly set the tmp directory.
       def set_application_directory!
-        Dir.chdir(File.expand_path('../../', APP_PATH)) unless File.exists?(File.expand_path("config.ru"))
+        Dir.chdir(File.expand_path('../../', APP_PATH)) unless File.exist?(File.expand_path("config.ru"))
       end
 
       def require_application_and_environment!
diff --git a/railties/lib/rails/generators/base.rb b/railties/lib/rails/generators/base.rb
index 681332a1447..71f732b16d6 100644
--- a/railties/lib/rails/generators/base.rb
+++ b/railties/lib/rails/generators/base.rb
@@ -212,7 +212,7 @@ module Rails
         return unless base_name && generator_name
         return unless default_generator_root
         path = File.join(default_generator_root, 'templates')
-        path if File.exists?(path)
+        path if File.exist?(path)
       end
 
       # Returns the base root for a common set of generators. This is used to dynamically
@@ -369,12 +369,12 @@ module Rails
             source_root && File.expand_path("../USAGE", source_root),
             default_generator_root && File.join(default_generator_root, "USAGE")
           ]
-          paths.compact.detect { |path| File.exists? path }
+          paths.compact.detect { |path| File.exist? path }
         end
 
         def self.default_generator_root
           path = File.expand_path(File.join(base_name, generator_name), base_root)
-          path if File.exists?(path)
+          path if File.exist?(path)
         end
 
     end
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index 04ef2ee0713..f86f938bc24 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -369,7 +369,7 @@ module Rails
         end
 
         def insert_railsrc_into_argv!(argv, railsrc)
-          return argv unless File.exists?(railsrc)
+          return argv unless File.exist?(railsrc)
           extra_args = read_rc_file railsrc
           argv.take(1) + extra_args + argv.drop(1)
         end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/boot.rb b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
index 35967366677..5e5f0c1fac0 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/boot.rb
+++ b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
@@ -1,4 +1,4 @@
 # Set up gems listed in the Gemfile.
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
 
-require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
diff --git a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
index 97ff6d1b8b4..813006bf7b2 100644
--- a/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
+++ b/railties/lib/rails/generators/rails/plugin/plugin_generator.rb
@@ -319,7 +319,7 @@ task default: :test
         @application_definition ||= begin
 
           dummy_application_path = File.expand_path("#{dummy_path}/config/application.rb", destination_root)
-          unless options[:pretend] || !File.exists?(dummy_application_path)
+          unless options[:pretend] || !File.exist?(dummy_application_path)
             contents = File.read(dummy_application_path)
             contents[(contents.index(/module ([\w]+)\n(.*)class Application/m))..-1]
           end
diff --git a/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb b/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb
index ef360470a3f..6266cfc5091 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb
+++ b/railties/lib/rails/generators/rails/plugin/templates/rails/boot.rb
@@ -1,5 +1,5 @@
 # Set up gems listed in the Gemfile.
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__)
 
-require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
 $LOAD_PATH.unshift File.expand_path('../../../../lib', __FILE__)
diff --git a/railties/lib/rails/generators/testing/assertions.rb b/railties/lib/rails/generators/testing/assertions.rb
index cc88e830dd0..2e877f8762a 100644
--- a/railties/lib/rails/generators/testing/assertions.rb
+++ b/railties/lib/rails/generators/testing/assertions.rb
@@ -22,7 +22,7 @@ module Rails
         #   end
         def assert_file(relative, *contents)
           absolute = File.expand_path(relative, destination_root).shellescape
-          assert File.exists?(absolute), "Expected file #{relative.inspect} to exist, but does not"
+          assert File.exist?(absolute), "Expected file #{relative.inspect} to exist, but does not"
 
           read = File.read(absolute) if block_given? || !contents.empty?
           yield read if block_given?
@@ -44,7 +44,7 @@ module Rails
         #   assert_no_file "config/random.rb"
         def assert_no_file(relative)
           absolute = File.expand_path(relative, destination_root)
-          assert !File.exists?(absolute), "Expected file #{relative.inspect} to not exist, but does"
+          assert !File.exist?(absolute), "Expected file #{relative.inspect} to not exist, but does"
         end
         alias :assert_no_directory :assert_no_file
 
diff --git a/railties/lib/rails/rack/log_tailer.rb b/railties/lib/rails/rack/log_tailer.rb
index 18f22e80894..50d0eb96fc1 100644
--- a/railties/lib/rails/rack/log_tailer.rb
+++ b/railties/lib/rails/rack/log_tailer.rb
@@ -7,7 +7,7 @@ module Rails
         path = Pathname.new(log || "#{::File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath
 
         @cursor = @file = nil
-        if ::File.exists?(path)
+        if ::File.exist?(path)
           @cursor = ::File.size(path)
           @file = ::File.open(path, 'r')
         end
diff --git a/railties/lib/rails/tasks/framework.rake b/railties/lib/rails/tasks/framework.rake
index bd4e7c33e06..e6693159349 100644
--- a/railties/lib/rails/tasks/framework.rake
+++ b/railties/lib/rails/tasks/framework.rake
@@ -46,7 +46,7 @@ namespace :rails do
         require 'rails/generators/rails/app/app_generator'
         gen = Rails::Generators::AppGenerator.new ["rails"], { with_dispatchers: true },
                                                              destination_root: Rails.root
-        File.exists?(Rails.root.join("config", "application.rb")) ?
+        File.exist?(Rails.root.join("config", "application.rb")) ?
           gen.send(:app_const) : gen.send(:valid_const?)
         gen
       end
diff --git a/railties/lib/rails/tasks/log.rake b/railties/lib/rails/tasks/log.rake
index 6c3f02eb0cb..877f175ef3a 100644
--- a/railties/lib/rails/tasks/log.rake
+++ b/railties/lib/rails/tasks/log.rake
@@ -10,7 +10,7 @@ namespace :log do
     if ENV['LOGS']
       ENV['LOGS'].split(',')
                   .map    { |file| "log/#{file.strip}.log" }
-                  .select { |file| File.exists?(file) }
+                  .select { |file| File.exist?(file) }
     else
       FileList["log/*.log"]
     end
diff --git a/railties/test/application/assets_test.rb b/railties/test/application/assets_test.rb
index 035535ce223..b235b51d909 100644
--- a/railties/test/application/assets_test.rb
+++ b/railties/test/application/assets_test.rb
@@ -37,7 +37,7 @@ module ApplicationTests
     end
 
     def assert_no_file_exists(filename)
-      assert !File.exists?(filename), "#{filename} does exist"
+      assert !File.exist?(filename), "#{filename} does exist"
     end
 
     test "assets routes have higher priority" do
diff --git a/railties/test/application/rake/dbs_test.rb b/railties/test/application/rake/dbs_test.rb
index 9e711f25bd3..4d348c6b4b0 100644
--- a/railties/test/application/rake/dbs_test.rb
+++ b/railties/test/application/rake/dbs_test.rb
@@ -33,12 +33,12 @@ module ApplicationTests
         Dir.chdir(app_path) do
           output = `bundle exec rake db:create`
           assert_equal output, ""
-          assert File.exists?(expected[:database])
+          assert File.exist?(expected[:database])
           assert_equal expected[:database],
                         ActiveRecord::Base.connection_config[:database]
           output = `bundle exec rake db:drop`
           assert_equal output, ""
-          assert !File.exists?(expected[:database])
+          assert !File.exist?(expected[:database])
         end
       end
 
diff --git a/railties/test/application/rake_test.rb b/railties/test/application/rake_test.rb
index c1cb1c1ebaa..2169304aa4b 100644
--- a/railties/test/application/rake_test.rb
+++ b/railties/test/application/rake_test.rb
@@ -227,7 +227,7 @@ module ApplicationTests
         # ensure we have a schema_migrations table to dump
         `bundle exec rake db:migrate db:structure:dump DB_STRUCTURE=db/my_structure.sql`
       end
-      assert File.exists?(File.join(app_path, 'db', 'my_structure.sql'))
+      assert File.exist?(File.join(app_path, 'db', 'my_structure.sql'))
     end
 
     def test_rake_dump_structure_should_be_called_twice_when_migrate_redo
@@ -248,24 +248,24 @@ module ApplicationTests
          rails generate model product name:string;
          bundle exec rake db:migrate db:schema:cache:dump`
       end
-      assert File.exists?(File.join(app_path, 'db', 'schema_cache.dump'))
+      assert File.exist?(File.join(app_path, 'db', 'schema_cache.dump'))
     end
 
     def test_rake_clear_schema_cache
       Dir.chdir(app_path) do
         `bundle exec rake db:schema:cache:dump db:schema:cache:clear`
       end
-      assert !File.exists?(File.join(app_path, 'db', 'schema_cache.dump'))
+      assert !File.exist?(File.join(app_path, 'db', 'schema_cache.dump'))
     end
 
     def test_copy_templates
       Dir.chdir(app_path) do
         `bundle exec rake rails:templates:copy`
         %w(controller mailer scaffold).each do |dir|
-          assert File.exists?(File.join(app_path, 'lib', 'templates', 'erb', dir))
+          assert File.exist?(File.join(app_path, 'lib', 'templates', 'erb', dir))
         end
         %w(controller helper scaffold_controller assets).each do |dir|
-          assert File.exists?(File.join(app_path, 'lib', 'templates', 'rails', dir))
+          assert File.exist?(File.join(app_path, 'lib', 'templates', 'rails', dir))
         end
       end
     end
diff --git a/railties/test/generators_test.rb b/railties/test/generators_test.rb
index 5130b285a98..eac28badfe7 100644
--- a/railties/test/generators_test.rb
+++ b/railties/test/generators_test.rb
@@ -15,7 +15,7 @@ class GeneratorsTest < Rails::Generators::TestCase
   end
 
   def test_simple_invoke
-    assert File.exists?(File.join(@path, 'generators', 'model_generator.rb'))
+    assert File.exist?(File.join(@path, 'generators', 'model_generator.rb'))
     TestUnit::Generators::ModelGenerator.expects(:start).with(["Account"], {})
     Rails::Generators.invoke("test_unit:model", ["Account"])
   end
@@ -31,7 +31,7 @@ class GeneratorsTest < Rails::Generators::TestCase
   end
 
   def test_should_give_higher_preference_to_rails_generators
-    assert File.exists?(File.join(@path, 'generators', 'model_generator.rb'))
+    assert File.exist?(File.join(@path, 'generators', 'model_generator.rb'))
     Rails::Generators::ModelGenerator.expects(:start).with(["Account"], {})
     warnings = capture(:stderr){ Rails::Generators.invoke :model, ["Account"] }
     assert warnings.empty?
diff --git a/railties/test/railties/engine_test.rb b/railties/test/railties/engine_test.rb
index d095535abd0..3075ffee0d8 100644
--- a/railties/test/railties/engine_test.rb
+++ b/railties/test/railties/engine_test.rb
@@ -90,8 +90,8 @@ module RailtiesTest
       Dir.chdir(app_path) do
         output = `bundle exec rake bukkits:install:migrations`
 
-        assert File.exists?("#{app_path}/db/migrate/2_create_users.bukkits.rb")
-        assert File.exists?("#{app_path}/db/migrate/3_add_last_name_to_users.bukkits.rb")
+        assert File.exist?("#{app_path}/db/migrate/2_create_users.bukkits.rb")
+        assert File.exist?("#{app_path}/db/migrate/3_add_last_name_to_users.bukkits.rb")
         assert_match(/Copied migration 2_create_users.bukkits.rb from bukkits/, output)
         assert_match(/Copied migration 3_add_last_name_to_users.bukkits.rb from bukkits/, output)
         assert_match(/NOTE: Migration 3_create_sessions.rb from bukkits has been skipped/, output)
@@ -136,7 +136,7 @@ module RailtiesTest
 
       Dir.chdir(@plugin.path) do
         output = `bundle exec rake app:bukkits:install:migrations`
-        assert File.exists?("#{app_path}/db/migrate/0_add_first_name_to_users.bukkits.rb")
+        assert File.exist?("#{app_path}/db/migrate/0_add_first_name_to_users.bukkits.rb")
         assert_match(/Copied migration 0_add_first_name_to_users.bukkits.rb from bukkits/, output)
         assert_equal 1, Dir["#{app_path}/db/migrate/*.rb"].length
       end