diff --git a/Appraisals b/Appraisals
index 516847c..3d1832d 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 appraise "rails-7-0" do
   gem "rails", "~> 7.0.0"
   gem "concurrent-ruby", "< 1.3.5" # to avoid problem described in https://github.com/rails/rails/pull/54264
diff --git a/Gemfile b/Gemfile
index 7702158..02c3b37 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gemspec
diff --git a/Rakefile b/Rakefile
index 3a28e6f..4b82612 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/setup"
 require "bundler/gem_tasks"
 require "rake/testtask"
diff --git a/jbuilder.gemspec b/jbuilder.gemspec
index 0b51953..2360467 100644
--- a/jbuilder.gemspec
+++ b/jbuilder.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "lib/jbuilder/version"
 
 Gem::Specification.new do |s|
diff --git a/lib/generators/rails/jbuilder_generator.rb b/lib/generators/rails/jbuilder_generator.rb
index 79f742e..81eb54e 100644
--- a/lib/generators/rails/jbuilder_generator.rb
+++ b/lib/generators/rails/jbuilder_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails/generators/named_base'
 require 'rails/generators/resource_helpers'
 
diff --git a/lib/generators/rails/scaffold_controller_generator.rb b/lib/generators/rails/scaffold_controller_generator.rb
index bf48f0c..42407c0 100644
--- a/lib/generators/rails/scaffold_controller_generator.rb
+++ b/lib/generators/rails/scaffold_controller_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails/generators'
 require 'rails/generators/rails/scaffold_controller/scaffold_controller_generator'
 
diff --git a/lib/jbuilder.rb b/lib/jbuilder.rb
index b12624b..466f9c1 100644
--- a/lib/jbuilder.rb
+++ b/lib/jbuilder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'active_support'
 require 'jbuilder/jbuilder'
 require 'jbuilder/blank'
diff --git a/lib/jbuilder/blank.rb b/lib/jbuilder/blank.rb
index 52af2c6..4116913 100644
--- a/lib/jbuilder/blank.rb
+++ b/lib/jbuilder/blank.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Jbuilder
   class Blank
     def ==(other)
diff --git a/lib/jbuilder/collection_renderer.rb b/lib/jbuilder/collection_renderer.rb
index 48707bf..8bce94c 100644
--- a/lib/jbuilder/collection_renderer.rb
+++ b/lib/jbuilder/collection_renderer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 require 'active_support/concern'
 require 'action_view'
diff --git a/lib/jbuilder/errors.rb b/lib/jbuilder/errors.rb
index 386e6da..e2de671 100644
--- a/lib/jbuilder/errors.rb
+++ b/lib/jbuilder/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'jbuilder/jbuilder'
 
 class Jbuilder
diff --git a/lib/jbuilder/jbuilder.rb b/lib/jbuilder/jbuilder.rb
index 22b0ac4..1fc3025 100644
--- a/lib/jbuilder/jbuilder.rb
+++ b/lib/jbuilder/jbuilder.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 Jbuilder = Class.new(BasicObject)
diff --git a/lib/jbuilder/jbuilder_dependency_tracker.rb b/lib/jbuilder/jbuilder_dependency_tracker.rb
index 62b6dbf..b37fade 100644
--- a/lib/jbuilder/jbuilder_dependency_tracker.rb
+++ b/lib/jbuilder/jbuilder_dependency_tracker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Jbuilder::DependencyTracker
   EXPLICIT_DEPENDENCY = /# Template Dependency: (\S+)/
 
diff --git a/lib/jbuilder/jbuilder_template.rb b/lib/jbuilder/jbuilder_template.rb
index 55f2d5f..46955c8 100644
--- a/lib/jbuilder/jbuilder_template.rb
+++ b/lib/jbuilder/jbuilder_template.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'jbuilder/jbuilder'
 require 'jbuilder/collection_renderer'
 require 'action_dispatch/http/mime_type'
diff --git a/lib/jbuilder/key_formatter.rb b/lib/jbuilder/key_formatter.rb
index c9e7eca..9e53d05 100644
--- a/lib/jbuilder/key_formatter.rb
+++ b/lib/jbuilder/key_formatter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'jbuilder/jbuilder'
 require 'active_support/core_ext/array'
 
diff --git a/lib/jbuilder/railtie.rb b/lib/jbuilder/railtie.rb
index 2aeefbb..1b7c412 100644
--- a/lib/jbuilder/railtie.rb
+++ b/lib/jbuilder/railtie.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails'
 require 'jbuilder/jbuilder_template'
 
diff --git a/lib/jbuilder/version.rb b/lib/jbuilder/version.rb
index 2a62782..3fe2e27 100644
--- a/lib/jbuilder/version.rb
+++ b/lib/jbuilder/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Jbuilder
   VERSION = "2.13.0"
 end