diff --git a/.rubocop.yml b/.rubocop.yml
index bb69a72..59a532c 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -54,6 +54,9 @@ Style/AndOr:
 Style/Not:
   Enabled: false
 
+Style/FrozenStringLiteralComment:
+  Enabled: true
+
 Documentation:
   Enabled: false # TODO: Enable again once we have more docs
 
diff --git a/Gemfile b/Gemfile
index 810a817..ba6ce20 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 ruby RUBY_VERSION
diff --git a/Rakefile b/Rakefile
index 0710298..7d829d9 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "rubygems"
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
diff --git a/lib/pundit/policy_finder.rb b/lib/pundit/policy_finder.rb
index 454052d..df072d9 100644
--- a/lib/pundit/policy_finder.rb
+++ b/lib/pundit/policy_finder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Pundit
   # Finds policy and scope classes for given object.
   # @api public
diff --git a/lib/pundit/rspec.rb b/lib/pundit/rspec.rb
index 3e5cc83..687cf17 100644
--- a/lib/pundit/rspec.rb
+++ b/lib/pundit/rspec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/array/conversions"
 
 module Pundit
diff --git a/pundit.gemspec b/pundit.gemspec
index 441a56d..d0c02a2 100644
--- a/pundit.gemspec
+++ b/pundit.gemspec
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "pundit/version"
diff --git a/spec/policies/post_policy_spec.rb b/spec/policies/post_policy_spec.rb
index 6b8bd1d..1d19ef9 100644
--- a/spec/policies/post_policy_spec.rb
+++ b/spec/policies/post_policy_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "spec_helper"
 
 describe PostPolicy do
diff --git a/spec/policy_finder_spec.rb b/spec/policy_finder_spec.rb
index 36386ca..76533c7 100644
--- a/spec/policy_finder_spec.rb
+++ b/spec/policy_finder_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "spec_helper"
 
 describe Pundit::PolicyFinder do
diff --git a/spec/pundit_spec.rb b/spec/pundit_spec.rb
index 6fe7b96..632f0c0 100644
--- a/spec/pundit_spec.rb
+++ b/spec/pundit_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "spec_helper"
 
 describe Pundit do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 50873af..3768762 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "pundit"
 require "pundit/rspec"