diff --git a/Gemfile b/Gemfile
index 2ea2f6f..06f6b81 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ group :development, :test do
   gem "byebug",   "~> 10.0.0", platforms: %i[mri mingw x64_mingw]
   gem "kaminari", "~> 1.1.1"
   gem "puma",     "~> 3.11.2"
-  gem "rubocop",  "~> 0.52.1", require: false
+  gem "rubocop",  "~> 0.55.0", require: false
   gem "sqlite3",  "~> 1.3.13"
 end
 
diff --git a/comfy_blog.gemspec b/comfy_blog.gemspec
index 15d624b..05fad3a 100644
--- a/comfy_blog.gemspec
+++ b/comfy_blog.gemspec
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-$LOAD_PATH.push File.expand_path("../lib", __FILE__)
+$LOAD_PATH.push File.expand_path("lib", __dir__)
 
 require "comfy_blog/version"
 
diff --git a/config/boot.rb b/config/boot.rb
index 64124af..1c1a70f 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Set up gems listed in the Gemfile.
-ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile", __FILE__)
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" if File.exist?(ENV["BUNDLE_GEMFILE"])
 File.exist?(ENV["BUNDLE_GEMFILE"])
diff --git a/config/environment.rb b/config/environment.rb
index 83f7a99..ae94282 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Load the rails application
-require File.expand_path("../application", __FILE__)
+require File.expand_path("application", __dir__)
 
 # Initialize the rails application
 ComfyBlog::Application.initialize!
diff --git a/lib/generators/comfy/blog/blog_generator.rb b/lib/generators/comfy/blog/blog_generator.rb
index 692f7af..b5f1a89 100644
--- a/lib/generators/comfy/blog/blog_generator.rb
+++ b/lib/generators/comfy/blog/blog_generator.rb
@@ -9,7 +9,7 @@ class BlogGenerator < Rails::Generators::Base
       include Rails::Generators::Migration
       include Thor::Actions
 
-      source_root File.expand_path("../../../../..", __FILE__)
+      source_root File.expand_path("../../../..", __dir__)
 
       def self.next_migration_number(dirname)
         ActiveRecord::Generators::Base.next_migration_number(dirname)
diff --git a/test/gemfiles/5.2.gemfile b/test/gemfiles/5.2.gemfile
index caa276d..e784560 100644
--- a/test/gemfiles/5.2.gemfile
+++ b/test/gemfiles/5.2.gemfile
@@ -1,4 +1,6 @@
-source 'http://rubygems.org'
+# frozen_string_literal: true
+
+source "http://rubygems.org"
 
 gemspec path: "../../"
 
@@ -9,7 +11,7 @@ group :development, :test do
   gem "byebug",   "~> 10.0.0", platforms: %i[mri mingw x64_mingw]
   gem "kaminari", "~> 1.1.1"
   gem "puma",     "~> 3.11.2"
-  gem "rubocop",  "~> 0.52.1", require: false
+  gem "rubocop",  "~> 0.55.0", require: false
   gem "sqlite3",  "~> 1.3.13"
 end
 
diff --git a/test/integration/i18n_test.rb b/test/integration/i18n_test.rb
index fa48b2d..d230827 100644
--- a/test/integration/i18n_test.rb
+++ b/test/integration/i18n_test.rb
@@ -4,16 +4,16 @@
 
 class I18nIntegrationTest < ActionDispatch::IntegrationTest
 
-  def collect_combined_keys(hash, ns = nil)
+  def collect_combined_keys(hash, namespace = nil)
     hash.collect do |k, v|
       keys = []
-      keys << collect_combined_keys(v, "#{ns}.#{k}") if v.is_a?(Hash)
-      keys << "#{ns}.#{k}"
+      keys << collect_combined_keys(v, "#{namespace}.#{k}") if v.is_a?(Hash)
+      keys << "#{namespace}.#{k}"
     end.flatten
   end
 
   def test_translations
-    locales_path = File.expand_path("../../../config/locales", __FILE__)
+    locales_path = File.expand_path("../../config/locales", __dir__)
     locales = Dir.glob("#{locales_path}/*.yml").collect do |file_path|
       File.basename(file_path, ".yml")
     end