diff --git a/Gemfile.lock b/Gemfile.lock
index f893412..2a1c958 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,7 +25,7 @@ GEM
     method_source (0.9.0)
     minitest (5.11.3)
     parallel (1.12.1)
-    parser (2.5.0.2)
+    parser (2.5.0.3)
       ast (~> 2.4.0)
     powerpack (0.1.1)
     pry (0.11.3)
@@ -46,15 +46,15 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    rubocop (0.52.1)
+    rubocop (0.53.0)
       parallel (~> 1.10)
-      parser (>= 2.4.0.2, < 3.0)
+      parser (>= 2.5)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    rubocop-rspec (1.23.0)
-      rubocop (>= 0.52.1)
+    rubocop-rspec (1.24.0)
+      rubocop (>= 0.53.0)
     ruby-progressbar (1.9.0)
     thor (0.20.0)
     thread_safe (0.3.6)
diff --git a/enumerate_it.gemspec b/enumerate_it.gemspec
index f4ba9b2..3c90d5e 100644
--- a/enumerate_it.gemspec
+++ b/enumerate_it.gemspec
@@ -1,4 +1,4 @@
-require File.expand_path('../lib/enumerate_it/version', __FILE__)
+require File.expand_path('lib/enumerate_it/version', __dir__)
 
 Gem::Specification.new do |gem|
   gem.authors       = ['Cássio Marques', 'Lucas Caton']
diff --git a/gemfiles/rails_3.0.gemfile b/gemfiles/rails_3.0.gemfile
index cc01ba6..effab6a 100644
--- a/gemfiles/rails_3.0.gemfile
+++ b/gemfiles/rails_3.0.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 3.0.20"
-gem "activerecord", "~> 3.0.20"
+gem 'activerecord', '~> 3.0.20'
+gem 'activesupport', '~> 3.0.20'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_3.1.gemfile b/gemfiles/rails_3.1.gemfile
index 7630ef4..fd7a746 100644
--- a/gemfiles/rails_3.1.gemfile
+++ b/gemfiles/rails_3.1.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 3.1.12"
-gem "activerecord", "~> 3.1.12"
+gem 'activerecord', '~> 3.1.12'
+gem 'activesupport', '~> 3.1.12'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_3.2.gemfile b/gemfiles/rails_3.2.gemfile
index eda22f4..d3e249b 100644
--- a/gemfiles/rails_3.2.gemfile
+++ b/gemfiles/rails_3.2.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 3.2.22.5"
-gem "activerecord", "~> 3.2.22.5"
+gem 'activerecord', '~> 3.2.22.5'
+gem 'activesupport', '~> 3.2.22.5'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_4.0.gemfile b/gemfiles/rails_4.0.gemfile
index 77c40da..9c20e8f 100644
--- a/gemfiles/rails_4.0.gemfile
+++ b/gemfiles/rails_4.0.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 4.0.13"
-gem "activerecord", "~> 4.0.13"
+gem 'activerecord', '~> 4.0.13'
+gem 'activesupport', '~> 4.0.13'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_4.1.gemfile b/gemfiles/rails_4.1.gemfile
index 9a08162..34971e0 100644
--- a/gemfiles/rails_4.1.gemfile
+++ b/gemfiles/rails_4.1.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 4.1.16"
-gem "activerecord", "~> 4.1.16"
+gem 'activerecord', '~> 4.1.16'
+gem 'activesupport', '~> 4.1.16'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_4.2.gemfile b/gemfiles/rails_4.2.gemfile
index 0d52d79..da8f342 100644
--- a/gemfiles/rails_4.2.gemfile
+++ b/gemfiles/rails_4.2.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 4.2.10"
-gem "activerecord", "~> 4.2.10"
+gem 'activerecord', '~> 4.2.10'
+gem 'activesupport', '~> 4.2.10'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_5.0.gemfile b/gemfiles/rails_5.0.gemfile
index 50f4038..1fee370 100644
--- a/gemfiles/rails_5.0.gemfile
+++ b/gemfiles/rails_5.0.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 5.0.6"
-gem "activerecord", "~> 5.0.6"
+gem 'activerecord', '~> 5.0.6'
+gem 'activesupport', '~> 5.0.6'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/gemfiles/rails_5.1.gemfile b/gemfiles/rails_5.1.gemfile
index e9dd3e1..13e5a96 100644
--- a/gemfiles/rails_5.1.gemfile
+++ b/gemfiles/rails_5.1.gemfile
@@ -1,8 +1,8 @@
 # This file was generated by Appraisal
 
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
-gem "activesupport", "~> 5.1.5"
-gem "activerecord", "~> 5.1.5"
+gem 'activerecord', '~> 5.1.5'
+gem 'activesupport', '~> 5.1.5'
 
-gemspec path: "../"
+gemspec path: '../'
diff --git a/lib/generators/enumerate_it/enum/enum_generator.rb b/lib/generators/enumerate_it/enum/enum_generator.rb
index 947ea93..67f6910 100644
--- a/lib/generators/enumerate_it/enum/enum_generator.rb
+++ b/lib/generators/enumerate_it/enum/enum_generator.rb
@@ -1,7 +1,7 @@
 module EnumerateIt
   module Generators
     class EnumGenerator < Rails::Generators::NamedBase
-      source_root File.expand_path('../templates', __FILE__)
+      source_root File.expand_path('templates', __dir__)
 
       argument :attributes, type: 'array'
 
diff --git a/spec/enumerate_it/base_spec.rb b/spec/enumerate_it/base_spec.rb
index 51f7f1b..624b4a1 100644
--- a/spec/enumerate_it/base_spec.rb
+++ b/spec/enumerate_it/base_spec.rb
@@ -251,7 +251,7 @@ class ActiveRecordStub
         attr_accessor :bla
 
         class << self
-          def validates_inclusion_of(_)
+          def validates_inclusion_of(_attribute)
             true
           end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 6c2b8b6..75d8b97 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,4 @@
-$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+$LOAD_PATH.unshift File.expand_path('../lib', __dir__)
 
 require 'enumerate_it'