diff --git a/.rubocop.yml b/.rubocop.yml
index ac8623638c73b..88d52c68be542 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -83,20 +83,8 @@ Style/FrozenStringLiteralComment:
   Enabled: true
   EnforcedStyle: always
   Include:
-    - 'activesupport/**/*'
-    - 'activemodel/**/*'
-    - 'actioncable/**/*'
-    - 'activejob/**/*'
-    - 'activerecord/**/*'
-    - 'activestorage/**/*'
-    - 'actionmailer/**/*'
-    - 'actionview/**/*'
-    - 'actionpack/**/*'
-    - 'ci/**/*'
-    - 'guides/**/*'
-    - 'tasks/**/*'
-    - 'tools/**/*'
   Exclude:
+    - 'railties/**/*'
     - 'actionview/test/**/*.builder'
     - 'actionview/test/**/*.ruby'
     - 'actionpack/test/**/*.builder'
diff --git a/Gemfile b/Gemfile
index 5e7d9b5b2e3d7..7fc8aa7552182 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
diff --git a/Rakefile b/Rakefile
index 1421851900295..a67f8fd028b26 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "net/http"
 
 $:.unshift __dir__
diff --git a/rails.gemspec b/rails.gemspec
index 31eee025bff62..4b57377871335 100644
--- a/rails.gemspec
+++ b/rails.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 version = File.read(File.expand_path("RAILS_VERSION", __dir__)).strip
 
 Gem::Specification.new do |s|
diff --git a/version.rb b/version.rb
index 7bacf2e0baaf2..92b5e0392a3ef 100644
--- a/version.rb
+++ b/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Rails
   # Returns the version of the currently loaded Rails as a <tt>Gem::Version</tt>
   def self.gem_version