diff --git a/.rubocop.yml b/.rubocop.yml
index a3e582e..2d63c01 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,6 +2,7 @@ AllCops:
   Exclude:
     - 'bin/*'
     - 'db/schema.rb'
+  NewCops: enable
 
 Style/ClassAndModuleChildren:
   Exclude:
@@ -17,6 +18,6 @@ Style/Documentation:
     - 'db/**/*'
     - 'test/**/*'
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 80
   IgnoredPatterns: ['\A\s*#']
diff --git a/Gemfile b/Gemfile
index 0edc5a3..6e9a12d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 git_source(:github) do |repo_name|
@@ -6,7 +8,7 @@ git_source(:github) do |repo_name|
 end
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 5.1.7'
+gem 'rails', '~> 5.2.4.3'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
@@ -24,11 +26,11 @@ gem 'jbuilder', '~> 2.5'
 gem 'activeadmin'
 gem 'devise'
 
+gem 'auto_strip_attributes'
 gem 'bootstrap'
 gem 'jquery-rails'
 gem 'rack-canonical-host'
 gem 'recaptcha', require: 'recaptcha/rails'
-gem 'auto_strip_attributes'
 gem 'scenic'
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 6c93a91..d1e4b6c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,60 +1,63 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.1.7)
-      actionpack (= 5.1.7)
+    actioncable (5.2.4.3)
+      actionpack (= 5.2.4.3)
       nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
+      websocket-driver (>= 0.6.1)
+    actionmailer (5.2.4.3)
+      actionpack (= 5.2.4.3)
+      actionview (= 5.2.4.3)
+      activejob (= 5.2.4.3)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.1.7)
-      actionview (= 5.1.7)
-      activesupport (= 5.1.7)
-      rack (~> 2.0)
+    actionpack (5.2.4.3)
+      actionview (= 5.2.4.3)
+      activesupport (= 5.2.4.3)
+      rack (~> 2.0, >= 2.0.8)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.7)
-      activesupport (= 5.1.7)
+    actionview (5.2.4.3)
+      activesupport (= 5.2.4.3)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activeadmin (1.2.1)
-      arbre (>= 1.1.1)
-      coffee-rails
+    activeadmin (2.7.0)
+      arbre (~> 1.2, >= 1.2.1)
       formtastic (~> 3.1)
-      formtastic_i18n
+      formtastic_i18n (~> 0.4)
       inherited_resources (~> 1.7)
-      jquery-rails (>= 4.2.0)
-      kaminari (>= 0.15, < 2.0)
-      railties (>= 4.2, < 5.2)
-      ransack (~> 1.3)
-      sass (~> 3.1)
-      sprockets (< 4.1)
-    activejob (5.1.7)
-      activesupport (= 5.1.7)
+      jquery-rails (~> 4.2)
+      kaminari (~> 1.0, >= 1.0.1)
+      railties (>= 5.2, < 6.1)
+      ransack (~> 2.1, >= 2.1.1)
+      sassc-rails (~> 2.1)
+      sprockets (>= 3.0, < 4.1)
+    activejob (5.2.4.3)
+      activesupport (= 5.2.4.3)
       globalid (>= 0.3.6)
-    activemodel (5.1.7)
-      activesupport (= 5.1.7)
-    activerecord (5.1.7)
-      activemodel (= 5.1.7)
-      activesupport (= 5.1.7)
-      arel (~> 8.0)
-    activesupport (5.1.7)
+    activemodel (5.2.4.3)
+      activesupport (= 5.2.4.3)
+    activerecord (5.2.4.3)
+      activemodel (= 5.2.4.3)
+      activesupport (= 5.2.4.3)
+      arel (>= 9.0)
+    activestorage (5.2.4.3)
+      actionpack (= 5.2.4.3)
+      activerecord (= 5.2.4.3)
+      marcel (~> 0.3.1)
+    activesupport (5.2.4.3)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    arbre (1.1.1)
+    arbre (1.2.1)
       activesupport (>= 3.0.0)
-    arel (8.0.0)
+    arel (9.0.0)
     ast (2.4.0)
     auto_strip_attributes (2.4.0)
       activerecord (>= 4.0)
@@ -77,13 +80,6 @@ GEM
       xpath (>= 2.0, < 4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
-    coffee-rails (4.2.2)
-      coffee-script (>= 2.2.0)
-      railties (>= 4.0.0)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.12.2)
     concurrent-ruby (1.1.6)
     crass (1.0.6)
     devise (4.7.1)
@@ -94,26 +90,26 @@ GEM
       warden (~> 1.2.3)
     erubi (1.9.0)
     execjs (2.7.0)
-    ffi (1.10.0)
+    ffi (1.12.2)
     formtastic (3.1.5)
       actionpack (>= 3.2.13)
     formtastic_i18n (0.6.0)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    has_scope (0.7.1)
-      actionpack (>= 4.1, < 5.2)
-      activesupport (>= 4.1, < 5.2)
+    has_scope (0.7.2)
+      actionpack (>= 4.1)
+      activesupport (>= 4.1)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
-    inherited_resources (1.8.0)
-      actionpack (>= 4.2, <= 5.2)
+    inherited_resources (1.11.0)
+      actionpack (>= 5.0, < 6.1)
       has_scope (~> 0.6)
-      railties (>= 4.2, <= 5.2)
-      responders
+      railties (>= 5.0, < 6.1)
+      responders (>= 2, < 4)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
-    jquery-rails (4.3.1)
+    jquery-rails (4.4.0)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
@@ -139,7 +135,10 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
     method_source (1.0.0)
+    mimemagic (0.3.5)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.1)
@@ -148,14 +147,13 @@ GEM
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
-    parallel (1.12.1)
-    parser (2.5.0.5)
+    parallel (1.19.1)
+    parser (2.7.1.3)
       ast (~> 2.4.0)
     pg (1.0.0)
-    polyamorous (1.3.3)
-      activerecord (>= 3.0)
+    polyamorous (2.3.2)
+      activerecord (>= 5.2.1)
     popper_js (1.14.5)
-    powerpack (0.1.1)
     public_suffix (3.0.2)
     puma (3.12.6)
     rack (2.2.2)
@@ -164,56 +162,60 @@ GEM
       rack (>= 1.0.0, < 3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.1.7)
-      actioncable (= 5.1.7)
-      actionmailer (= 5.1.7)
-      actionpack (= 5.1.7)
-      actionview (= 5.1.7)
-      activejob (= 5.1.7)
-      activemodel (= 5.1.7)
-      activerecord (= 5.1.7)
-      activesupport (= 5.1.7)
+    rails (5.2.4.3)
+      actioncable (= 5.2.4.3)
+      actionmailer (= 5.2.4.3)
+      actionpack (= 5.2.4.3)
+      actionview (= 5.2.4.3)
+      activejob (= 5.2.4.3)
+      activemodel (= 5.2.4.3)
+      activerecord (= 5.2.4.3)
+      activestorage (= 5.2.4.3)
+      activesupport (= 5.2.4.3)
       bundler (>= 1.3.0)
-      railties (= 5.1.7)
+      railties (= 5.2.4.3)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
-    railties (5.1.7)
-      actionpack (= 5.1.7)
-      activesupport (= 5.1.7)
+    railties (5.2.4.3)
+      actionpack (= 5.2.4.3)
+      activesupport (= 5.2.4.3)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+      thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (13.0.1)
-    ransack (1.8.8)
-      actionpack (>= 3.0)
-      activerecord (>= 3.0)
-      activesupport (>= 3.0)
+    ransack (2.3.2)
+      activerecord (>= 5.2.1)
+      activesupport (>= 5.2.1)
       i18n
-      polyamorous (~> 1.3.2)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+      polyamorous (= 2.3.2)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
     recaptcha (4.7.0)
       json
-    responders (3.0.0)
+    responders (3.0.1)
       actionpack (>= 5.0)
       railties (>= 5.0)
-    rubocop (0.54.0)
+    rexml (3.2.4)
+    rubocop (0.84.0)
       parallel (~> 1.10)
-      parser (>= 2.5)
-      powerpack (~> 0.1)
+      parser (>= 2.7.0.1)
       rainbow (>= 2.2.2, < 4.0)
+      rexml
+      rubocop-ast (>= 0.0.3)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.9.0)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-ast (0.0.3)
+      parser (>= 2.7.0.1)
+    ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
     rubyzip (1.3.0)
-    sass (3.7.3)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -258,7 +260,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.1.8)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (1.3.0)
+    unicode-display_width (1.7.0)
     warden (1.2.8)
       rack (>= 2.0.6)
     web-console (3.5.1)
@@ -266,7 +268,7 @@ GEM
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
-    websocket-driver (0.6.5)
+    websocket-driver (0.7.2)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.4)
     xpath (3.0.0)
@@ -288,7 +290,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   puma (~> 3.12)
   rack-canonical-host
-  rails (~> 5.1.7)
+  rails (~> 5.2.4.3)
   recaptcha
   rubocop
   sass-rails (~> 5.0)
diff --git a/Rakefile b/Rakefile
index e85f913..488c551 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
diff --git a/app/admin/admin_users.rb b/app/admin/admin_users.rb
index fed0ec1..78e454e 100644
--- a/app/admin/admin_users.rb
+++ b/app/admin/admin_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.register AdminUser do
   permit_params :email, :password, :password_confirmation
 
diff --git a/app/admin/attendees.rb b/app/admin/attendees.rb
index 1d2e1e3..8c7c872 100644
--- a/app/admin/attendees.rb
+++ b/app/admin/attendees.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.register Attendee do
   scope :child?
   scope :diet?
diff --git a/app/admin/dashboard.rb b/app/admin/dashboard.rb
index 706695e..21064f9 100644
--- a/app/admin/dashboard.rb
+++ b/app/admin/dashboard.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.register_page 'Dashboard' do
   menu priority: 1, label: proc { I18n.t('active_admin.dashboard') }
 
diff --git a/app/admin/guests.rb b/app/admin/guests.rb
index 1996eba..d44c309 100644
--- a/app/admin/guests.rb
+++ b/app/admin/guests.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.register Guest do
   permit_params :email, :first_name, :last_name, :attending, :diet, :songs,
                 :notes
diff --git a/app/admin/plus_ones.rb b/app/admin/plus_ones.rb
index 7108b02..6d51b2b 100644
--- a/app/admin/plus_ones.rb
+++ b/app/admin/plus_ones.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.register PlusOne do
   permit_params :first_name, :last_name, :diet, :child
 
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 1a55b5f..c3fda60 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
 
diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index f1571a7..998d677 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GuestsController < ApplicationController
   def new
     respond_to :html
diff --git a/app/controllers/plus_ones_controller.rb b/app/controllers/plus_ones_controller.rb
index aaf5209..a67c91c 100644
--- a/app/controllers/plus_ones_controller.rb
+++ b/app/controllers/plus_ones_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PlusOnesController < ApplicationController
   before_action do
     @guest = Guest.find_by_id_token(params[:guest_id])
@@ -41,7 +43,7 @@ class PlusOnesController < ApplicationController
   def destroy
     respond_to :html
     @plus_one = @guest.plus_ones.find_by(id: params[:id])
-    @plus_one.destroy if @plus_one
+    @plus_one&.destroy
     redirect_to guest_plus_ones_path(@guest)
   end
 
diff --git a/app/controllers/welcome_controller.rb b/app/controllers/welcome_controller.rb
index cfb1eae..c38f8c8 100644
--- a/app/controllers/welcome_controller.rb
+++ b/app/controllers/welcome_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WelcomeController < ApplicationController
   def index
     @google_maps_url = 'https://goo.gl/maps/nBAxNAsmPSS2'
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index c3736b3..1e35587 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ApplicationHelper
   def flash_class(key)
     case key
@@ -10,6 +12,7 @@ module ApplicationHelper
 
   def errors_for(object)
     return unless object.errors.any?
+
     content_tag(:div, class: 'mb-3 card border-danger') do
       concat(content_tag(:div, class: 'card-header bg-danger text-white') do
         concat "Oops, #{pluralize(object.errors.count, 'problem')}:"
diff --git a/app/helpers/guests_helper.rb b/app/helpers/guests_helper.rb
index 00317bf..10452d8 100644
--- a/app/helpers/guests_helper.rb
+++ b/app/helpers/guests_helper.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module GuestsHelper
 end
diff --git a/app/helpers/plus_ones_helper.rb b/app/helpers/plus_ones_helper.rb
index f836a53..e9b538a 100644
--- a/app/helpers/plus_ones_helper.rb
+++ b/app/helpers/plus_ones_helper.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module PlusOnesHelper
 end
diff --git a/app/helpers/welcome_helper.rb b/app/helpers/welcome_helper.rb
index eeead45..4ada0f4 100644
--- a/app/helpers/welcome_helper.rb
+++ b/app/helpers/welcome_helper.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module WelcomeHelper
 end
diff --git a/app/jobs/application_job.rb b/app/jobs/application_job.rb
index a009ace..d92ffdd 100644
--- a/app/jobs/application_job.rb
+++ b/app/jobs/application_job.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class ApplicationJob < ActiveJob::Base
 end
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index 286b223..d84cb6e 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationMailer < ActionMailer::Base
   default from: 'from@example.com'
   layout 'mailer'
diff --git a/app/mailers/guest_mailer.rb b/app/mailers/guest_mailer.rb
index 2056fdc..96eb525 100644
--- a/app/mailers/guest_mailer.rb
+++ b/app/mailers/guest_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class GuestMailer < ApplicationMailer
   default from: ENV['FROM_EMAIL'], reply_to: ENV['CONTACT_EMAIL']
 
diff --git a/app/models/admin_user.rb b/app/models/admin_user.rb
index 4226312..a77517f 100644
--- a/app/models/admin_user.rb
+++ b/app/models/admin_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #
 # ActiveAdmin console user.
 #
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index 10a4cba..71fbba5 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 end
diff --git a/app/models/attendee.rb b/app/models/attendee.rb
index 2893a57..e9c8acc 100644
--- a/app/models/attendee.rb
+++ b/app/models/attendee.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #
 # A guest or plus one.
 #
diff --git a/app/models/concerns/findable_with_token.rb b/app/models/concerns/findable_with_token.rb
index da5f07f..e33be74 100644
--- a/app/models/concerns/findable_with_token.rb
+++ b/app/models/concerns/findable_with_token.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 #
 # Make a model findable only when a secure token is provided.
 #
 module FindableWithToken
   extend ActiveSupport::Concern
 
-  ID_TOKEN_RX = /\A(\d+)-(\w+)\z/
+  ID_TOKEN_RX = /\A(\d+)-(\w+)\z/.freeze
 
   included do
     has_secure_token
@@ -15,12 +17,14 @@ module FindableWithToken
 
     def self.find_by_id_token(id_token)
       raise ActiveRecord::RecordNotFound unless id_token =~ ID_TOKEN_RX
+
       id = Regexp.last_match(1)
       token = Regexp.last_match(2)
 
       record = find(id)
       raise ActiveRecord::RecordNotFound unless
         ActiveSupport::SecurityUtils.secure_compare(record.token, token)
+
       record
     end
   end
diff --git a/app/models/guest.rb b/app/models/guest.rb
index 8c87705..cedc818 100644
--- a/app/models/guest.rb
+++ b/app/models/guest.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #
 # A primary guest.
 #
@@ -26,6 +28,7 @@ class Guest < ApplicationRecord
   def email_safe_salutation
     return 'Hello,' if
       first_name.blank? || first_name !~ /\A[\p{Word}\s'-]{1,30}\z/i
+
     "Dear #{first_name},"
   end
 
diff --git a/app/models/plus_one.rb b/app/models/plus_one.rb
index bfcd4a9..bbf4f61 100644
--- a/app/models/plus_one.rb
+++ b/app/models/plus_one.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 #
 # An extra guest.
 #
diff --git a/bin/bundle b/bin/bundle
index 66e9889..f19acf5 100755
--- a/bin/bundle
+++ b/bin/bundle
@@ -1,3 +1,3 @@
 #!/usr/bin/env ruby
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 load Gem.bin_path('bundler', 'bundle')
diff --git a/bin/rails b/bin/rails
index 5badb2f..0739660 100755
--- a/bin/rails
+++ b/bin/rails
@@ -1,9 +1,4 @@
 #!/usr/bin/env ruby
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
 APP_PATH = File.expand_path('../config/application', __dir__)
 require_relative '../config/boot'
 require 'rails/commands'
diff --git a/bin/rake b/bin/rake
index d87d5f5..1724048 100755
--- a/bin/rake
+++ b/bin/rake
@@ -1,9 +1,4 @@
 #!/usr/bin/env ruby
-begin
-  load File.expand_path('../spring', __FILE__)
-rescue LoadError => e
-  raise unless e.message.include?('spring')
-end
 require_relative '../config/boot'
 require 'rake'
 Rake.application.run
diff --git a/bin/setup b/bin/setup
index 78c4e86..94fd4d7 100755
--- a/bin/setup
+++ b/bin/setup
@@ -1,10 +1,9 @@
 #!/usr/bin/env ruby
-require 'pathname'
 require 'fileutils'
 include FileUtils
 
 # path to your application root.
-APP_ROOT = Pathname.new File.expand_path('../../', __FILE__)
+APP_ROOT = File.expand_path('..', __dir__)
 
 def system!(*args)
   system(*args) || abort("\n== Command #{args} failed ==")
@@ -21,7 +20,6 @@ chdir APP_ROOT do
   # Install JavaScript dependencies if using Yarn
   # system('bin/yarn')
 
-
   # puts "\n== Copying sample files =="
   # unless File.exist?('config/database.yml')
   #   cp 'config/database.yml.sample', 'config/database.yml'
diff --git a/bin/update b/bin/update
index a8e4462..58bfaed 100755
--- a/bin/update
+++ b/bin/update
@@ -1,10 +1,9 @@
 #!/usr/bin/env ruby
-require 'pathname'
 require 'fileutils'
 include FileUtils
 
 # path to your application root.
-APP_ROOT = Pathname.new File.expand_path('../../', __FILE__)
+APP_ROOT = File.expand_path('..', __dir__)
 
 def system!(*args)
   system(*args) || abort("\n== Command #{args} failed ==")
@@ -18,6 +17,9 @@ chdir APP_ROOT do
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')
 
+  # Install JavaScript dependencies if using Yarn
+  # system('bin/yarn')
+
   puts "\n== Updating database =="
   system! 'bin/rails db:migrate'
 
diff --git a/bin/yarn b/bin/yarn
index c2bacef..460dd56 100755
--- a/bin/yarn
+++ b/bin/yarn
@@ -1,8 +1,8 @@
 #!/usr/bin/env ruby
-VENDOR_PATH = File.expand_path('..', __dir__)
-Dir.chdir(VENDOR_PATH) do
+APP_ROOT = File.expand_path('..', __dir__)
+Dir.chdir(APP_ROOT) do
   begin
-    exec "yarnpkg #{ARGV.join(" ")}"
+    exec "yarnpkg", *ARGV
   rescue Errno::ENOENT
     $stderr.puts "Yarn executable was not detected in the system."
     $stderr.puts "Download Yarn at https://yarnpkg.com/en/docs/install"
diff --git a/config.ru b/config.ru
index 02dbfae..6a1dea3 100644
--- a/config.ru
+++ b/config.ru
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file is used by Rack-based servers to start the application.
 
 require_relative 'config/environment'
diff --git a/config/application.rb b/config/application.rb
index 03f6dfa..e68c504 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative 'boot'
 
 require 'rails'
@@ -5,6 +7,7 @@ require 'rails'
 require 'active_model/railtie'
 require 'active_job/railtie'
 require 'active_record/railtie'
+require 'active_storage/engine'
 require 'action_controller/railtie'
 require 'action_mailer/railtie'
 require 'action_view/railtie'
@@ -22,7 +25,8 @@ module Wedding
     config.load_defaults 5.1
 
     # Settings in config/environments/* take precedence over those specified here.
-    # Application configuration should go into files in config/initializers
-    # -- all .rb files in that directory are automatically loaded.
+    # Application configuration can go into files in config/initializers
+    # -- all .rb files in that directory are automatically loaded after loading
+    # the framework and any gems in your application.
   end
 end
diff --git a/config/boot.rb b/config/boot.rb
index 30f5120..c04863f 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,6 @@
+# frozen_string_literal: true
+
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 require 'bundler/setup' # Set up gems listed in the Gemfile.
+require 'bootsnap/setup' # Speed up boot time by caching expensive operations.
diff --git a/config/environment.rb b/config/environment.rb
index 426333b..d5abe55 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Load the Rails application.
 require_relative 'application'
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index f8fa811..9a41767 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
@@ -13,12 +15,13 @@ Rails.application.configure do
   config.consider_all_requests_local = true
 
   # Enable/disable caching. By default caching is disabled.
-  if Rails.root.join('tmp/caching-dev.txt').exist?
+  # Run rails dev:cache to toggle caching.
+  if Rails.root.join('tmp', 'caching-dev.txt').exist?
     config.action_controller.perform_caching = true
 
     config.cache_store = :memory_store
     config.public_file_server.headers = {
-      'Cache-Control' => "public, max-age=#{2.days.seconds.to_i}"
+      'Cache-Control' => "public, max-age=#{2.days.to_i}"
     }
   else
     config.action_controller.perform_caching = false
@@ -26,6 +29,9 @@ Rails.application.configure do
     config.cache_store = :null_store
   end
 
+  # Store uploaded files on the local file system (see config/storage.yml for options)
+  config.active_storage.service = :local
+
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
@@ -37,6 +43,9 @@ Rails.application.configure do
   # Raise an error on page load if there are pending migrations.
   config.active_record.migration_error = :page_load
 
+  # Highlight code that triggered database queries in logs.
+  config.active_record.verbose_query_logs = true
+
   # Debug mode disables concatenation and preprocessing of assets.
   # This option may cause significant delays in view rendering with a large
   # number of complex assets.
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 93648db..f971248 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
@@ -14,10 +16,9 @@ Rails.application.configure do
   config.consider_all_requests_local       = false
   config.action_controller.perform_caching = true
 
-  # Attempt to read encrypted secrets from `config/secrets.yml.enc`.
-  # Requires an encryption key in `ENV["RAILS_MASTER_KEY"]` or
-  # `config/secrets.yml.key`.
-  config.read_encrypted_secrets = true
+  # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
+  # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
+  # config.require_master_key = true
 
   # Disable serving static files from the `/public` folder by default since
   # Apache or NGINX already handles this.
@@ -39,6 +40,9 @@ Rails.application.configure do
   # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
   # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
 
+  # Store uploaded files on the local file system (see config/storage.yml for options)
+  config.active_storage.service = :local
+
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   # config.force_ssl = true
 
@@ -55,6 +59,7 @@ Rails.application.configure do
   # Use a real queuing backend for Active Job (and separate queues per environment)
   # config.active_job.queue_adapter     = :resque
   # config.active_job.queue_name_prefix = "wedding_#{Rails.env}"
+
   config.action_mailer.perform_caching = false
 
   # Ignore bad email addresses and do not raise email delivery errors.
@@ -67,18 +72,18 @@ Rails.application.configure do
   }
 
   config.action_mailer.smtp_settings = {
-    address:              ENV['SMTP_ADDRESS'],
-    port:                 (ENV['SMTP_PORT'] || 587).to_i,
-    domain:               ENV['SMTP_DOMAIN'],
-    user_name:            ENV['SMTP_USER_NAME'],
-    password:             ENV['SMTP_PASSWORD'],
-    authentication:       ENV['SMTP_AUTHENTICATION'] || 'plain',
+    address: ENV['SMTP_ADDRESS'],
+    port: (ENV['SMTP_PORT'] || 587).to_i,
+    domain: ENV['SMTP_DOMAIN'],
+    user_name: ENV['SMTP_USER_NAME'],
+    password: ENV['SMTP_PASSWORD'],
+    authentication: ENV['SMTP_AUTHENTICATION'] || 'plain',
     enable_starttls_auto: ENV['SMTP_ENABLE_STARTTLS_AUTO'] || 'true'
   }
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).
-  config.i18n.fallbacks = [I18n.default_locale]
+  config.i18n.fallbacks = true
 
   # Send deprecation notices to registered listeners.
   config.active_support.deprecation = :notify
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 514401e..e6078ba 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
@@ -15,7 +17,7 @@ Rails.application.configure do
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {
-    'Cache-Control' => "public, max-age=#{1.hour.seconds.to_i}"
+    'Cache-Control' => "public, max-age=#{1.hour.to_i}"
   }
 
   # Show full error reports and disable caching.
@@ -27,6 +29,10 @@ Rails.application.configure do
 
   # Disable request forgery protection in test environment.
   config.action_controller.allow_forgery_protection = false
+
+  # Store uploaded files on the local file system in a temporary directory
+  config.active_storage.service = :test
+
   config.action_mailer.perform_caching = false
 
   # Tell Action Mailer not to deliver emails to the real world.
diff --git a/config/initializers/active_admin.rb b/config/initializers/active_admin.rb
index 7ac893c..6f83bb7 100644
--- a/config/initializers/active_admin.rb
+++ b/config/initializers/active_admin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ActiveAdmin.setup do |config|
   # == Site Title
   #
diff --git a/config/initializers/application_controller_renderer.rb b/config/initializers/application_controller_renderer.rb
index 89d2efa..f4556db 100644
--- a/config/initializers/application_controller_renderer.rb
+++ b/config/initializers/application_controller_renderer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # ActiveSupport::Reloader.to_prepare do
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index 295bf72..b5eff6f 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.
diff --git a/config/initializers/backtrace_silencers.rb b/config/initializers/backtrace_silencers.rb
index 59385cd..d0f0d3b 100644
--- a/config/initializers/backtrace_silencers.rb
+++ b/config/initializers/backtrace_silencers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
new file mode 100644
index 0000000..497f566
--- /dev/null
+++ b/config/initializers/content_security_policy.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+# Be sure to restart your server when you modify this file.
+
+# Define an application-wide content security policy
+# For further information see the following documentation
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+
+# Rails.application.config.content_security_policy do |policy|
+#   policy.default_src :self, :https
+#   policy.font_src    :self, :https, :data
+#   policy.img_src     :self, :https, :data
+#   policy.object_src  :none
+#   policy.script_src  :self, :https
+#   policy.style_src   :self, :https
+
+#   # Specify URI for violation reports
+#   # policy.report_uri "/csp-violation-report-endpoint"
+# end
+
+# If you are using UJS then enable automatic nonce generation
+# Rails.application.config.content_security_policy_nonce_generator = -> request { SecureRandom.base64(16) }
+
+# Report CSP violations to a specified URI
+# For further information see the following documentation:
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
+# Rails.application.config.content_security_policy_report_only = true
diff --git a/config/initializers/cookies_serializer.rb b/config/initializers/cookies_serializer.rb
index 5a6a32d..ee8dff9 100644
--- a/config/initializers/cookies_serializer.rb
+++ b/config/initializers/cookies_serializer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Specify a serializer for the signed and encrypted cookie jars.
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index 4a994e1..7a4f47b 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index ac033bf..aa7435f 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/config/initializers/mime_types.rb b/config/initializers/mime_types.rb
index dc18996..6e1d16f 100644
--- a/config/initializers/mime_types.rb
+++ b/config/initializers/mime_types.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new mime types for use in respond_to blocks:
diff --git a/config/initializers/new_framework_defaults_5_2.rb b/config/initializers/new_framework_defaults_5_2.rb
new file mode 100644
index 0000000..7df9ce8
--- /dev/null
+++ b/config/initializers/new_framework_defaults_5_2.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+# Be sure to restart your server when you modify this file.
+#
+# This file contains migration options to ease your Rails 5.2 upgrade.
+#
+# Once upgraded flip defaults one by one to migrate to the new default.
+#
+# Read the Guide for Upgrading Ruby on Rails for more info on each option.
+
+# Make Active Record use stable #cache_key alongside new #cache_version method.
+# This is needed for recyclable cache keys.
+# Rails.application.config.active_record.cache_versioning = true
+
+# Use AES-256-GCM authenticated encryption for encrypted cookies.
+# Also, embed cookie expiry in signed or encrypted cookies for increased security.
+#
+# This option is not backwards compatible with earlier Rails versions.
+# It's best enabled when your entire app is migrated and stable on 5.2.
+#
+# Existing cookies will be converted on read then written with the new scheme.
+# Rails.application.config.action_dispatch.use_authenticated_cookie_encryption = true
+
+# Use AES-256-GCM authenticated encryption as default cipher for encrypting messages
+# instead of AES-256-CBC, when use_authenticated_message_encryption is set to true.
+# Rails.application.config.active_support.use_authenticated_message_encryption = true
+
+# Add default protection from forgery to ActionController::Base instead of in
+# ApplicationController.
+# Rails.application.config.action_controller.default_protect_from_forgery = true
+
+# Store boolean values are in sqlite3 databases as 1 and 0 instead of 't' and
+# 'f' after migrating old data.
+# Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true
+
+# Use SHA-1 instead of MD5 to generate non-sensitive digests, such as the ETag header.
+# Rails.application.config.active_support.use_sha1_digests = true
+
+# Make `form_with` generate id attributes for any generated HTML tags.
+# Rails.application.config.action_view.form_with_generates_ids = true
diff --git a/config/initializers/wrap_parameters.rb b/config/initializers/wrap_parameters.rb
index bbfc396..2f3c0db 100644
--- a/config/initializers/wrap_parameters.rb
+++ b/config/initializers/wrap_parameters.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # This file contains settings for ActionController::ParamsWrapper which
diff --git a/config/puma.rb b/config/puma.rb
index ccda173..2f6d14e 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Puma can serve each request in a thread from an internal thread pool.
 # The `threads` method setting takes two numbers: a minimum and maximum.
 # Any libraries that use thread pools should be configured to match
@@ -15,6 +17,9 @@ port        ENV.fetch('PORT') { 3000 }
 #
 environment ENV.fetch('RAILS_ENV') { 'development' }
 
+# Specifies the `pidfile` that Puma will use.
+pidfile ENV.fetch('PIDFILE') { 'tmp/pids/server.pid' }
+
 # Specifies the number of `workers` to boot in clustered mode.
 # Workers are forked webserver processes. If using threads and workers together
 # the concurrency of the application would be max `threads` * `workers`.
@@ -26,31 +31,9 @@ environment ENV.fetch('RAILS_ENV') { 'development' }
 # Use the `preload_app!` method when specifying a `workers` number.
 # This directive tells Puma to first boot the application and load code
 # before forking the application. This takes advantage of Copy On Write
-# process behavior so workers use less memory. If you use this option
-# you need to make sure to reconnect any threads in the `on_worker_boot`
-# block.
+# process behavior so workers use less memory.
 #
 # preload_app!
 
-# If you are preloading your application and using Active Record, it's
-# recommended that you close any connections to the database before workers
-# are forked to prevent connection leakage.
-#
-# before_fork do
-#   ActiveRecord::Base.connection_pool.disconnect! if defined?(ActiveRecord)
-# end
-
-# The code in the `on_worker_boot` will be called if you are using
-# clustered mode by specifying a number of `workers`. After each worker
-# process is booted, this block will be run. If you are using the `preload_app!`
-# option, you will want to use this block to reconnect to any threads
-# or connections that may have been created at application boot, as Ruby
-# cannot share connections between processes.
-#
-# on_worker_boot do
-#   ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
-# end
-#
-
 # Allow puma to be restarted by `rails restart` command.
 plugin :tmp_restart
diff --git a/config/routes.rb b/config/routes.rb
index 5d49e29..d54478a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.routes.draw do
   devise_for :admin_users, ActiveAdmin::Devise.config
   ActiveAdmin.routes(self)
diff --git a/config/spring.rb b/config/spring.rb
index 9fa7863..c5933e4 100644
--- a/config/spring.rb
+++ b/config/spring.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 %w[
   .ruby-version
   .rbenv-vars
diff --git a/config/storage.yml b/config/storage.yml
new file mode 100644
index 0000000..d32f76e
--- /dev/null
+++ b/config/storage.yml
@@ -0,0 +1,34 @@
+test:
+  service: Disk
+  root: <%= Rails.root.join("tmp/storage") %>
+
+local:
+  service: Disk
+  root: <%= Rails.root.join("storage") %>
+
+# Use rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
+# amazon:
+#   service: S3
+#   access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
+#   secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
+#   region: us-east-1
+#   bucket: your_own_bucket
+
+# Remember not to checkin your GCS keyfile to a repository
+# google:
+#   service: GCS
+#   project: your_project
+#   credentials: <%= Rails.root.join("path/to/gcs.keyfile") %>
+#   bucket: your_own_bucket
+
+# Use rails credentials:edit to set the Azure Storage secret (as azure_storage:storage_access_key)
+# microsoft:
+#   service: AzureStorage
+#   storage_account_name: your_account_name
+#   storage_access_key: <%= Rails.application.credentials.dig(:azure_storage, :storage_access_key) %>
+#   container: your_container_name
+
+# mirror:
+#   service: Mirror
+#   primary: local
+#   mirrors: [ amazon, google, microsoft ]
diff --git a/db/migrate/20180324193210_create_guests.rb b/db/migrate/20180324193210_create_guests.rb
index d4fcfb3..9548909 100644
--- a/db/migrate/20180324193210_create_guests.rb
+++ b/db/migrate/20180324193210_create_guests.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateGuests < ActiveRecord::Migration[5.1]
   def change
     create_table :guests do |t|
diff --git a/db/migrate/20180324195736_create_active_admin_comments.rb b/db/migrate/20180324195736_create_active_admin_comments.rb
index 8abb5e5..3188de4 100644
--- a/db/migrate/20180324195736_create_active_admin_comments.rb
+++ b/db/migrate/20180324195736_create_active_admin_comments.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateActiveAdminComments < ActiveRecord::Migration::Current
   def self.up
     create_table :active_admin_comments do |t|
diff --git a/db/migrate/20180325090310_add_guest_info.rb b/db/migrate/20180325090310_add_guest_info.rb
index 9862d38..7377b5e 100644
--- a/db/migrate/20180325090310_add_guest_info.rb
+++ b/db/migrate/20180325090310_add_guest_info.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddGuestInfo < ActiveRecord::Migration[5.1]
   def change
     enable_extension('citext')
diff --git a/db/migrate/20180325135427_create_plus_ones.rb b/db/migrate/20180325135427_create_plus_ones.rb
index 8d22cf6..6530541 100644
--- a/db/migrate/20180325135427_create_plus_ones.rb
+++ b/db/migrate/20180325135427_create_plus_ones.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreatePlusOnes < ActiveRecord::Migration[5.1]
   def change
     create_table :plus_ones do |t|
diff --git a/db/migrate/20180325202641_simplify_diet.rb b/db/migrate/20180325202641_simplify_diet.rb
index 3e3cd28..fa28ea3 100644
--- a/db/migrate/20180325202641_simplify_diet.rb
+++ b/db/migrate/20180325202641_simplify_diet.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SimplifyDiet < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|
diff --git a/db/migrate/20180325212232_add_guest_notes.rb b/db/migrate/20180325212232_add_guest_notes.rb
index 1544c9c..ae55ab6 100644
--- a/db/migrate/20180325212232_add_guest_notes.rb
+++ b/db/migrate/20180325212232_add_guest_notes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddGuestNotes < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|
diff --git a/db/migrate/20180329080019_add_first_name_last_name_to_guest.rb b/db/migrate/20180329080019_add_first_name_last_name_to_guest.rb
index 73d1f8a..af65dad 100644
--- a/db/migrate/20180329080019_add_first_name_last_name_to_guest.rb
+++ b/db/migrate/20180329080019_add_first_name_last_name_to_guest.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddFirstNameLastNameToGuest < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|
diff --git a/db/migrate/20180329080718_add_first_name_last_name_to_plus_one.rb b/db/migrate/20180329080718_add_first_name_last_name_to_plus_one.rb
index 4eb78c7..d4cc415 100644
--- a/db/migrate/20180329080718_add_first_name_last_name_to_plus_one.rb
+++ b/db/migrate/20180329080718_add_first_name_last_name_to_plus_one.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddFirstNameLastNameToPlusOne < ActiveRecord::Migration[5.1]
   def change
     change_table :plus_ones do |t|
diff --git a/db/migrate/20180329212947_add_confirmed_at_to_guests.rb b/db/migrate/20180329212947_add_confirmed_at_to_guests.rb
index 2402f52..999c5da 100644
--- a/db/migrate/20180329212947_add_confirmed_at_to_guests.rb
+++ b/db/migrate/20180329212947_add_confirmed_at_to_guests.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddConfirmedAtToGuests < ActiveRecord::Migration[5.1]
   def change
     change_table :guests do |t|
diff --git a/db/migrate/20180804103058_create_attendees.rb b/db/migrate/20180804103058_create_attendees.rb
index 38b0e9e..91e7843 100644
--- a/db/migrate/20180804103058_create_attendees.rb
+++ b/db/migrate/20180804103058_create_attendees.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateAttendees < ActiveRecord::Migration[5.1]
   def change
     create_view :attendees
diff --git a/db/seeds.rb b/db/seeds.rb
index d3f43ce..0c4eb95 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file should contain all the record creation needed to seed the database with its default values.
 # The data can then be loaded with the rails db:seed command (or created alongside the database with db:setup).
 #
diff --git a/lib/rack/x_robots_tag.rb b/lib/rack/x_robots_tag.rb
index 9dba526..66d03d2 100644
--- a/lib/rack/x_robots_tag.rb
+++ b/lib/rack/x_robots_tag.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Rack
   #
   # Set X-Robots-Tag header to ask search engines not to index us.
diff --git a/test/application_system_test_case.rb b/test/application_system_test_case.rb
index e8d8dfb..de31944 100644
--- a/test/application_system_test_case.rb
+++ b/test/application_system_test_case.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
diff --git a/test/controllers/guests_controller_test.rb b/test/controllers/guests_controller_test.rb
index f5b60bf..aa95f95 100644
--- a/test/controllers/guests_controller_test.rb
+++ b/test/controllers/guests_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class GuestsControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/controllers/plus_ones_controller_test.rb b/test/controllers/plus_ones_controller_test.rb
index 8d299b4..aa68330 100644
--- a/test/controllers/plus_ones_controller_test.rb
+++ b/test/controllers/plus_ones_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class PlusOnesControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/controllers/welcome_controller_test.rb b/test/controllers/welcome_controller_test.rb
index d43612b..85201e4 100644
--- a/test/controllers/welcome_controller_test.rb
+++ b/test/controllers/welcome_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class WelcomeControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/mailers/guest_mailer_test.rb b/test/mailers/guest_mailer_test.rb
index 80e11dd..b8369c8 100644
--- a/test/mailers/guest_mailer_test.rb
+++ b/test/mailers/guest_mailer_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class GuestMailerTest < ActionMailer::TestCase
diff --git a/test/mailers/previews/guest_mailer_preview.rb b/test/mailers/previews/guest_mailer_preview.rb
index 443dce7..516911f 100644
--- a/test/mailers/previews/guest_mailer_preview.rb
+++ b/test/mailers/previews/guest_mailer_preview.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Preview all emails at http://localhost:3000/rails/mailers/guest_mailer
 class GuestMailerPreview < ActionMailer::Preview
   def confirmation_email_attending
diff --git a/test/models/admin_user_test.rb b/test/models/admin_user_test.rb
index 6215c04..81a20b4 100644
--- a/test/models/admin_user_test.rb
+++ b/test/models/admin_user_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class AdminUserTest < ActiveSupport::TestCase
diff --git a/test/models/attendee_test.rb b/test/models/attendee_test.rb
index 163e393..ac47922 100644
--- a/test/models/attendee_test.rb
+++ b/test/models/attendee_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class AttendeeTest < ActiveSupport::TestCase
diff --git a/test/models/guest_test.rb b/test/models/guest_test.rb
index 24224bb..fb61f19 100644
--- a/test/models/guest_test.rb
+++ b/test/models/guest_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class GuestTest < ActiveSupport::TestCase
diff --git a/test/models/plus_one_test.rb b/test/models/plus_one_test.rb
index f026094..9a29e75 100644
--- a/test/models/plus_one_test.rb
+++ b/test/models/plus_one_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class PlusOneTest < ActiveSupport::TestCase
diff --git a/test/system/rsvp_happy_path_test.rb b/test/system/rsvp_happy_path_test.rb
index c05c130..5b9b1d0 100644
--- a/test/system/rsvp_happy_path_test.rb
+++ b/test/system/rsvp_happy_path_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'application_system_test_case'
 
 class RsvpHappyPathTest < ApplicationSystemTestCase
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 88d8f43..039f9fd 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ENV['RAILS_ENV'] ||= 'test'
 require File.expand_path('../config/environment', __dir__)
 require 'rails/test_help'