diff --git a/lib/rails/convert_rails_logger.rb b/lib/rails/convert_rails_logger.rb
index 3625394d..9ef27594 100644
--- a/lib/rails/convert_rails_logger.rb
+++ b/lib/rails/convert_rails_logger.rb
@@ -2,17 +2,17 @@
 
 Synvert::Rewriter.new 'rails', 'convert_rails_logger' do
   description <<~EOS
-  It converts RAILS_DEFAULT_LOGGER to Rails.logger.
+    It converts RAILS_DEFAULT_LOGGER to Rails.logger.
 
-  ```ruby
-  RAILS_DEFAULT_LOGGER
-  ```
+    ```ruby
+    RAILS_DEFAULT_LOGGER
+    ```
 
-  =>
+    =>
 
-  ```ruby
-  Rails.logger
-  ```
+    ```ruby
+    Rails.logger
+    ```
   EOS
 
   if_gem 'rails', { gte: '2.3.0' }
diff --git a/spec/rails/add_application_job_spec.rb b/spec/rails/add_application_job_spec.rb
index b891d6c9..94f6a4ff 100644
--- a/spec/rails/add_application_job_spec.rb
+++ b/spec/rails/add_application_job_spec.rb
@@ -9,8 +9,8 @@
     let(:fake_file_path) { 'app/jobs/application_job.rb' }
     let(:test_content) { nil }
     let(:test_rewritten_content) { <<~EOS }
-        class ApplicationJob < ActiveJob::Base
-        end
+      class ApplicationJob < ActiveJob::Base
+      end
     EOS
 
     include_examples 'convertable'
@@ -19,13 +19,13 @@ class ApplicationJob < ActiveJob::Base
   context 'rename ActiveJob::Base' do
     let(:fake_file_path) { 'app/jobs/post_job.rb' }
     let(:test_content) { <<~EOS }
-        class PostJob < ActiveJob::Base
-        end
+      class PostJob < ActiveJob::Base
+      end
     EOS
 
     let(:test_rewritten_content) { <<~EOS }
-        class PostJob < ApplicationJob
-        end
+      class PostJob < ApplicationJob
+      end
     EOS
 
     include_examples 'convertable'
diff --git a/spec/rails/add_application_record_spec.rb b/spec/rails/add_application_record_spec.rb
index 32a92dfb..1887044d 100644
--- a/spec/rails/add_application_record_spec.rb
+++ b/spec/rails/add_application_record_spec.rb
@@ -9,9 +9,9 @@
     let(:fake_file_path) { 'app/models/application_record.rb' }
     let(:test_content) { nil }
     let(:test_rewritten_content) { <<~EOS }
-        class ApplicationRecord < ActiveRecord::Base
-          self.abstract_class = true
-        end
+      class ApplicationRecord < ActiveRecord::Base
+        self.abstract_class = true
+      end
     EOS
 
     include_examples 'convertable'
@@ -20,13 +20,13 @@ class ApplicationRecord < ActiveRecord::Base
   context 'rename ActiveRecord::Base' do
     let(:fake_file_path) { 'app/models/post.rb' }
     let(:test_content) { <<~EOS }
-        class Post < ActiveRecord::Base
-        end
+      class Post < ActiveRecord::Base
+      end
     EOS
 
     let(:test_rewritten_content) { <<~EOS }
-        class Post < ApplicationRecord
-        end
+      class Post < ApplicationRecord
+      end
     EOS
 
     include_examples 'convertable'
diff --git a/spec/rails/convert_active_record_dirty_5_0_to_5_1_spec.rb b/spec/rails/convert_active_record_dirty_5_0_to_5_1_spec.rb
index 2dae297e..284deeee 100644
--- a/spec/rails/convert_active_record_dirty_5_0_to_5_1_spec.rb
+++ b/spec/rails/convert_active_record_dirty_5_0_to_5_1_spec.rb
@@ -6,70 +6,70 @@
   let(:rewriter_name) { 'rails/convert_active_record_dirty_5_0_to_5_1' }
   let(:fake_file_path) { 'app/models/post.rb' }
   let(:schema_content) { <<~EOS }
-      ActiveRecord::Schema.define(version: 20140211112752) do
-        create_table "posts", force: true do |t|
-          t.string   "title"
-          t.string   "summary"
-          t.boolean  "status"
-          t.timestamps
-        end
+    ActiveRecord::Schema.define(version: 20140211112752) do
+      create_table "posts", force: true do |t|
+        t.string   "title"
+        t.string   "summary"
+        t.boolean  "status"
+        t.timestamps
       end
+    end
   EOS
 
   let(:test_content) { <<~EOS }
-      class Post < ActiveRecord::Base
-        before_create :call_before_create
-        before_update :call_before_update, unless: :title_changed?
-        before_save :call_before_save, if: -> { status_changed? || summary_changed? }
-        after_create :call_after_create
-        after_update :call_after_update, unless: :title_changed?
-        after_save :call_after_save, if: -> { status_changed? || summary_changed? }
+    class Post < ActiveRecord::Base
+      before_create :call_before_create
+      before_update :call_before_update, unless: :title_changed?
+      before_save :call_before_save, if: -> { status_changed? || summary_changed? }
+      after_create :call_after_create
+      after_update :call_after_update, unless: :title_changed?
+      after_save :call_after_save, if: -> { status_changed? || summary_changed? }
 
-        before_save do
-          if title_changed?
-          end
+      before_save do
+        if title_changed?
         end
+      end
 
-        def call_before_create
-          if title_changed?
-            changes
-          end
+      def call_before_create
+        if title_changed?
+          changes
         end
+      end
 
-        def call_after_create
-          if title_changed?
-            changes
-          end
+      def call_after_create
+        if title_changed?
+          changes
         end
       end
+    end
   EOS
 
   let(:test_rewritten_content) { <<~EOS }
-      class Post < ActiveRecord::Base
-        before_create :call_before_create
-        before_update :call_before_update, unless: :will_save_change_to_title?
-        before_save :call_before_save, if: -> { will_save_change_to_status? || will_save_change_to_summary? }
-        after_create :call_after_create
-        after_update :call_after_update, unless: :saved_change_to_title?
-        after_save :call_after_save, if: -> { saved_change_to_status? || saved_change_to_summary? }
+    class Post < ActiveRecord::Base
+      before_create :call_before_create
+      before_update :call_before_update, unless: :will_save_change_to_title?
+      before_save :call_before_save, if: -> { will_save_change_to_status? || will_save_change_to_summary? }
+      after_create :call_after_create
+      after_update :call_after_update, unless: :saved_change_to_title?
+      after_save :call_after_save, if: -> { saved_change_to_status? || saved_change_to_summary? }
 
-        before_save do
-          if will_save_change_to_title?
-          end
+      before_save do
+        if will_save_change_to_title?
         end
+      end
 
-        def call_before_create
-          if will_save_change_to_title?
-            changes_to_save
-          end
+      def call_before_create
+        if will_save_change_to_title?
+          changes_to_save
         end
+      end
 
-        def call_after_create
-          if saved_change_to_title?
-            saved_changes
-          end
+      def call_after_create
+        if saved_change_to_title?
+          saved_changes
         end
       end
+    end
   EOS
 
   before do
diff --git a/spec/rails/convert_render_text_to_render_plain_spec.rb b/spec/rails/convert_render_text_to_render_plain_spec.rb
index f941df96..0384a04c 100644
--- a/spec/rails/convert_render_text_to_render_plain_spec.rb
+++ b/spec/rails/convert_render_text_to_render_plain_spec.rb
@@ -6,27 +6,27 @@
   let(:rewriter_name) { 'rails/convert_render_text_to_render_plain' }
   let(:fake_file_path) { 'app/controllers/posts_controller.rb' }
   let(:test_content) { <<~EOS }
-      class PostsController < ApplicationController
-        def foo
-          render text: 'OK'
-        end
+    class PostsController < ApplicationController
+      def foo
+        render text: 'OK'
+      end
 
-        def bar
-          render text: 'Not OK', status: 403
-        end
+      def bar
+        render text: 'Not OK', status: 403
       end
+    end
   EOS
 
   let(:test_rewritten_content) { <<~EOS }
-      class PostsController < ApplicationController
-        def foo
-          render plain: 'OK'
-        end
+    class PostsController < ApplicationController
+      def foo
+        render plain: 'OK'
+      end
 
-        def bar
-          render plain: 'Not OK', status: 403
-        end
+      def bar
+        render plain: 'Not OK', status: 403
       end
+    end
   EOS
 
   include_examples 'convertable'
diff --git a/spec/rails/upgrade_3_0_to_3_1_spec.rb b/spec/rails/upgrade_3_0_to_3_1_spec.rb
index ecb0d6fa..5de157e9 100644
--- a/spec/rails/upgrade_3_0_to_3_1_spec.rb
+++ b/spec/rails/upgrade_3_0_to_3_1_spec.rb
@@ -63,15 +63,15 @@
   '
   }
   let(:wrap_parameters_rewritten_content) { <<~EOS }
-      # Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
-      ActiveSupport.on_load(:action_controller) do
-        wrap_parameters format: [:json]
-      end
+    # Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
+    ActiveSupport.on_load(:action_controller) do
+      wrap_parameters format: [:json]
+    end
 
-      # Disable root element in JSON by default.
-      ActiveSupport.on_load(:active_record) do
-        self.include_root_in_json = false
-      end
+    # Disable root element in JSON by default.
+    ActiveSupport.on_load(:active_record) do
+      self.include_root_in_json = false
+    end
   EOS
 
   let(:session_store_content) {
diff --git a/spec/ruby/new_2_2_hash_syntax_spec.rb b/spec/ruby/new_2_2_hash_syntax_spec.rb
index d1e82aa6..5a39aa48 100644
--- a/spec/ruby/new_2_2_hash_syntax_spec.rb
+++ b/spec/ruby/new_2_2_hash_syntax_spec.rb
@@ -5,19 +5,19 @@
 RSpec.describe 'Uses ruby 2.2 new hash synax' do
   let(:rewriter_name) { 'ruby/new_2_2_hash_syntax' }
   let(:test_content) { <<~'EOS' }
-      { :foo => 'bar', 'foo' => 'bar' }
-      { :key1 => 'value1', :key2 => 'value2' }
-      { foo_key: 'foo_value', bar_key: 42, "baz-key" => true }
-      { :"foo-#{key}" => 'foo_value', :"bar-key" => 42, :"a\tb" => false, :"c'd" => nil }
-      { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
+    { :foo => 'bar', 'foo' => 'bar' }
+    { :key1 => 'value1', :key2 => 'value2' }
+    { foo_key: 'foo_value', bar_key: 42, "baz-key" => true }
+    { :"foo-#{key}" => 'foo_value', :"bar-key" => 42, :"a\tb" => false, :"c'd" => nil }
+    { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
   EOS
 
   let(:test_rewritten_content) { <<~'EOS' }
-      { foo: 'bar', 'foo' => 'bar' }
-      { key1: 'value1', key2: 'value2' }
-      { foo_key: 'foo_value', bar_key: 42, "baz-key" => true }
-      { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
-      { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
+    { foo: 'bar', 'foo' => 'bar' }
+    { key1: 'value1', key2: 'value2' }
+    { foo_key: 'foo_value', bar_key: 42, "baz-key" => true }
+    { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
+    { "foo-#{key}": 'foo_value', 'bar-key': 42, "a\tb": false, "c'd": nil }
   EOS
 
   before do