diff --git a/.ruby-version b/.ruby-version
index 0bee604df..197c4d5c2 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.3.3
+2.4.0
diff --git a/Gemfile b/Gemfile
index f5849d555..9c7979e69 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
-ruby '2.3.3'
+ruby '2.4.0'
 
-gem 'rails',    '~> 4.2.7'
+gem 'rails',    '~> 5.0'
 gem 'scrivito'
 
 gem 'scrivito_section_widgets'
@@ -35,6 +35,10 @@ group :development, :test do
   gem 'minitest-retry'
 end
 
+group :test do
+  gem 'rails-controller-testing'
+end
+
 group :production do
   gem 'pg'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 743a7be10..96a6f8e29 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,50 +1,52 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.2.7.1)
-      actionpack (= 4.2.7.1)
-      actionview (= 4.2.7.1)
-      activejob (= 4.2.7.1)
+    actioncable (5.0.1)
+      actionpack (= 5.0.1)
+      nio4r (~> 1.2)
+      websocket-driver (~> 0.6.1)
+    actionmailer (5.0.1)
+      actionpack (= 5.0.1)
+      actionview (= 5.0.1)
+      activejob (= 5.0.1)
       mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.7.1)
-      actionview (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
-      rack (~> 1.6)
-      rack-test (~> 0.6.2)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-dom-testing (~> 2.0)
+    actionpack (5.0.1)
+      actionview (= 5.0.1)
+      activesupport (= 5.0.1)
+      rack (~> 2.0)
+      rack-test (~> 0.6.3)
+      rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (4.2.7.1)
-      activesupport (= 4.2.7.1)
+    actionview (5.0.1)
+      activesupport (= 5.0.1)
       builder (~> 3.1)
       erubis (~> 2.7.0)
-      rails-dom-testing (~> 1.0, >= 1.0.5)
+      rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    activejob (4.2.7.1)
-      activesupport (= 4.2.7.1)
-      globalid (>= 0.3.0)
-    activemodel (4.2.7.1)
-      activesupport (= 4.2.7.1)
-      builder (~> 3.1)
-    activerecord (4.2.7.1)
-      activemodel (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
-      arel (~> 6.0)
-    activesupport (4.2.7.1)
+    activejob (5.0.1)
+      activesupport (= 5.0.1)
+      globalid (>= 0.3.6)
+    activemodel (5.0.1)
+      activesupport (= 5.0.1)
+    activerecord (5.0.1)
+      activemodel (= 5.0.1)
+      activesupport (= 5.0.1)
+      arel (~> 7.0)
+    activesupport (5.0.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.4.0)
-    arel (6.0.4)
-    autoprefixer-rails (6.6.0)
+    arel (7.1.4)
+    autoprefixer-rails (6.6.1)
       execjs
     backports (3.6.8)
     bootstrap-sass (3.3.7)
       autoprefixer-rails (>= 5.2.1)
       sass (>= 3.3.4)
-    builder (3.2.2)
+    builder (3.2.3)
     coderay (1.1.1)
     coffee-rails (4.2.1)
       coffee-script (>= 2.2.0)
@@ -61,11 +63,11 @@ GEM
     ethon (0.10.1)
       ffi (>= 1.3.0)
     execjs (2.7.0)
-    faraday (0.10.0)
+    faraday (0.11.0)
       multipart-post (>= 1.2, < 3)
-    faraday_middleware (0.10.1)
+    faraday_middleware (0.11.0)
       faraday (>= 0.7.4, < 1.0)
-    ffi (1.9.14)
+    ffi (1.9.17)
     font-awesome-rails (4.7.0.1)
       railties (>= 3.2, < 5.1)
     gh (0.15.0)
@@ -91,7 +93,7 @@ GEM
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
-    json (1.8.3)
+    json (2.0.3)
     launchy (2.4.3)
       addressable (~> 2.3)
     loofah (2.0.3)
@@ -105,12 +107,13 @@ GEM
     mime-types-data (3.2016.0521)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
-    minitest-retry (0.1.6)
+    minitest-retry (0.1.8)
       minitest (>= 5.0)
     multi_json (1.12.1)
     multipart-post (2.0.0)
     net-http-persistent (2.9.4)
     net-http-pipeline (1.0.1)
+    nio4r (1.2.1)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
     pg (0.19.0)
@@ -123,31 +126,34 @@ GEM
     pusher-client (0.6.2)
       json
       websocket (~> 1.0)
-    rack (1.6.5)
+    rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
-    rails (4.2.7.1)
-      actionmailer (= 4.2.7.1)
-      actionpack (= 4.2.7.1)
-      actionview (= 4.2.7.1)
-      activejob (= 4.2.7.1)
-      activemodel (= 4.2.7.1)
-      activerecord (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
+    rails (5.0.1)
+      actioncable (= 5.0.1)
+      actionmailer (= 5.0.1)
+      actionpack (= 5.0.1)
+      actionview (= 5.0.1)
+      activejob (= 5.0.1)
+      activemodel (= 5.0.1)
+      activerecord (= 5.0.1)
+      activesupport (= 5.0.1)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.7.1)
-      sprockets-rails
-    rails-deprecated_sanitizer (1.0.3)
-      activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.8)
-      activesupport (>= 4.2.0.beta, < 5.0)
+      railties (= 5.0.1)
+      sprockets-rails (>= 2.0.0)
+    rails-controller-testing (1.0.1)
+      actionpack (~> 5.x)
+      actionview (~> 5.x)
+      activesupport (~> 5.x)
+    rails-dom-testing (2.0.2)
+      activesupport (>= 4.2.0, < 6.0)
       nokogiri (~> 1.6)
-      rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
-    railties (4.2.7.1)
-      actionpack (= 4.2.7.1)
-      activesupport (= 4.2.7.1)
+    railties (5.0.1)
+      actionpack (= 5.0.1)
+      activesupport (= 5.0.1)
+      method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.0.0)
@@ -175,39 +181,39 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    scrivito (1.6.1)
+    scrivito (1.7.0)
       railties
-      scrivito_content_browser (= 1.6.1)
-      scrivito_editors (= 1.6.1)
-      scrivito_sdk (= 1.6.1)
-      scrivito_ui (= 1.6.1)
-    scrivito_content_browser (1.6.1)
+      scrivito_content_browser (= 1.7.0)
+      scrivito_editors (= 1.7.0)
+      scrivito_sdk (= 1.7.0)
+      scrivito_ui (= 1.7.0)
+    scrivito_content_browser (1.7.0)
       railties
-      scrivito_sdk (= 1.6.1)
-    scrivito_editors (1.6.1)
+      scrivito_sdk (= 1.7.0)
+    scrivito_editors (1.7.0)
       jquery-ui-rails (>= 5.0.0, < 7.0.0)
       railties
-      scrivito_content_browser (= 1.6.1)
-      scrivito_sdk (= 1.6.1)
-    scrivito_sdk (1.6.1)
+      scrivito_content_browser (= 1.7.0)
+      scrivito_sdk (= 1.7.0)
+    scrivito_sdk (1.7.0)
       addressable (~> 2.3)
       connection_pool (~> 2.2)
       diff-lcs (~> 1.2)
       hyp_diff (~> 0.0.4)
       jbuilder (~> 2.0)
-      json (>= 1.7.7)
+      json (>= 1.8.3)
       memoist (>= 0.12.0)
       multipart-post (~> 2.0)
       nokogiri (~> 1.6)
-      rails (~> 4.2.0)
+      rails (>= 4.2, < 5.1)
       rake (>= 0.9.2.2)
     scrivito_section_widgets (1.0.4)
       scrivito
     scrivito_teaser_widget (0.1.2)
       scrivito
-    scrivito_ui (1.6.1)
+    scrivito_ui (1.7.0)
       railties
-    secure_headers (3.5.1)
+    secure_headers (3.6.0)
       useragent
     simple_grid_rails (0.1.0)
     slop (3.6.0)
@@ -220,7 +226,7 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sqlite3 (1.3.12)
+    sqlite3 (1.3.13)
     thor (0.19.4)
     thread_safe (0.3.5)
     tilt (2.0.5)
@@ -240,11 +246,15 @@ GEM
     uglifier (3.0.4)
       execjs (>= 0.3.0, < 3)
     useragent (0.16.8)
-    web-console (3.3.0)
-      activemodel (>= 4.2)
+    web-console (3.4.0)
+      actionview (>= 5.0)
+      activemodel (>= 5.0)
       debug_inspector
-      railties (>= 4.2)
+      railties (>= 5.0)
     websocket (1.2.3)
+    websocket-driver (0.6.4)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.2)
 
 PLATFORMS
   ruby
@@ -258,7 +268,8 @@ DEPENDENCIES
   minitest-retry
   pg
   pry-rails
-  rails (~> 4.2.7)
+  rails (~> 5.0)
+  rails-controller-testing
   rake
   rspec-rails
   sass-rails
@@ -274,7 +285,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 2.3.3p222
+   ruby 2.4.0p0
 
 BUNDLED WITH
    1.13.7
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 374c1c928..5c082ced1 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 class SessionsController < ApplicationController
-  before_filter :logged_in_user, only: [:destroy]
+  before_action :logged_in_user, only: [:destroy]
 
   def create
     if valid_credentials?(params[:email], params[:password])
diff --git a/app/jobs/application_job.rb b/app/jobs/application_job.rb
new file mode 100644
index 000000000..a009ace51
--- /dev/null
+++ b/app/jobs/application_job.rb
@@ -0,0 +1,2 @@
+class ApplicationJob < ActiveJob::Base
+end
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
new file mode 100644
index 000000000..10a4cba84
--- /dev/null
+++ b/app/models/application_record.rb
@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end
diff --git a/app/models/dojo.rb b/app/models/dojo.rb
index 90e3176e1..8cc5dd507 100644
--- a/app/models/dojo.rb
+++ b/app/models/dojo.rb
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-class Dojo < ActiveRecord::Base
+class Dojo < ApplicationRecord
   NUM_OF_COUNTRIES   = "70"
   NUM_OF_WHOLE_DOJOS = "1,200"
   NUM_OF_JAPAN_DOJOS = "70"
diff --git a/bin/rails b/bin/rails
index 0138d79b7..073966023 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', __FILE__)
+APP_PATH = File.expand_path('../config/application', __dir__)
 require_relative '../config/boot'
 require 'rails/commands'
diff --git a/bin/rake b/bin/rake
index d87d5f578..17240489f 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 acdb2c138..e620b4dad 100755
--- a/bin/setup
+++ b/bin/setup
@@ -1,29 +1,34 @@
 #!/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 = Pathname.new File.expand_path('../../', __FILE__)
 
-Dir.chdir APP_ROOT do
+def system!(*args)
+  system(*args) || abort("\n== Command #{args} failed ==")
+end
+
+chdir APP_ROOT do
   # This script is a starting point to setup your application.
-  # Add necessary setup steps to this file:
+  # Add necessary setup steps to this file.
 
-  puts "== Installing dependencies =="
-  system "gem install bundler --conservative"
-  system "bundle check || bundle install"
+  puts '== Installing dependencies =='
+  system! 'gem install bundler --conservative'
+  system('bundle check') || system!('bundle install')
 
   # puts "\n== Copying sample files =="
-  # unless File.exist?("config/database.yml")
-  #   system "cp config/database.yml.sample config/database.yml"
+  # unless File.exist?('config/database.yml')
+  #   cp 'config/database.yml.sample', 'config/database.yml'
   # end
 
   puts "\n== Preparing database =="
-  system "bin/rake db:setup"
+  system! 'bin/rails db:setup'
 
   puts "\n== Removing old logs and tempfiles =="
-  system "rm -f log/*"
-  system "rm -rf tmp/cache"
+  system! 'bin/rails log:clear tmp:clear'
 
   puts "\n== Restarting application server =="
-  system "touch tmp/restart.txt"
+  system! 'bin/rails restart'
 end
diff --git a/bin/update b/bin/update
new file mode 100755
index 000000000..a8e4462f2
--- /dev/null
+++ b/bin/update
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+require 'pathname'
+require 'fileutils'
+include FileUtils
+
+# path to your application root.
+APP_ROOT = Pathname.new File.expand_path('../../', __FILE__)
+
+def system!(*args)
+  system(*args) || abort("\n== Command #{args} failed ==")
+end
+
+chdir APP_ROOT do
+  # This script is a way to update your development environment automatically.
+  # Add necessary update steps to this file.
+
+  puts '== Installing dependencies =='
+  system! 'gem install bundler --conservative'
+  system('bundle check') || system!('bundle install')
+
+  puts "\n== Updating database =="
+  system! 'bin/rails db:migrate'
+
+  puts "\n== Removing old logs and tempfiles =="
+  system! 'bin/rails log:clear tmp:clear'
+
+  puts "\n== Restarting application server =="
+  system! 'bin/rails restart'
+end
diff --git a/config/application.rb b/config/application.rb
index 1c162db2b..06b42023f 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../boot', __FILE__)
+require_relative 'boot'
 
 require 'rails/all'
 
@@ -11,16 +11,5 @@ class Application < Rails::Application
     # 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.
-
-    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
-    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
-    # config.time_zone = 'Central Time (US & Canada)'
-
-    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
-    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
-    # config.i18n.default_locale = :de
-
-    # Do not swallow errors in after_commit/after_rollback callbacks.
-    config.active_record.raise_in_transactional_callbacks = true
   end
 end
diff --git a/config/boot.rb b/config/boot.rb
index 6b750f00b..30f5120df 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,3 @@
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 require 'bundler/setup' # Set up gems listed in the Gemfile.
diff --git a/config/cable.yml b/config/cable.yml
new file mode 100644
index 000000000..0bbde6f74
--- /dev/null
+++ b/config/cable.yml
@@ -0,0 +1,9 @@
+development:
+  adapter: async
+
+test:
+  adapter: async
+
+production:
+  adapter: redis
+  url: redis://localhost:6379/1
diff --git a/config/environment.rb b/config/environment.rb
index ee8d90dc6..426333bb4 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,5 +1,5 @@
 # Load the Rails application.
-require File.expand_path('../application', __FILE__)
+require_relative 'application'
 
 # Initialize the Rails application.
 Rails.application.initialize!
diff --git a/config/environments/development.rb b/config/environments/development.rb
index b55e2144b..e64889cdb 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -9,13 +9,28 @@
   # Do not eager load code on boot.
   config.eager_load = false
 
-  # Show full error reports and disable caching.
-  config.consider_all_requests_local       = true
-  config.action_controller.perform_caching = false
+  # Show full error reports.
+  config.consider_all_requests_local = true
+
+  # Enable/disable caching. By default caching is disabled.
+  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=172800'
+    }
+  else
+    config.action_controller.perform_caching = false
+
+    config.cache_store = :null_store
+  end
 
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
+  config.action_mailer.perform_caching = false
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
@@ -27,15 +42,13 @@
   # number of complex assets.
   config.assets.debug = true
 
-  # Asset digests allow you to set far-future HTTP expiration dates on all assets,
-  # yet still be able to expire them through the digest params.
-  config.assets.digest = true
-
-  # Adds additional error checking when serving assets at runtime.
-  # Checks for improperly declared sprockets dependencies.
-  # Raises helpful error messages.
-  config.assets.raise_runtime_errors = true
+  # Suppress logger output for asset requests.
+  config.assets.quiet = true
 
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
+
+  # Use an evented file watcher to asynchronously detect changes in source code,
+  # routes, locales, etc. This feature depends on the listen gem.
+  # config.file_watcher = ActiveSupport::EventedFileUpdateChecker
 end
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 03845d87a..41817590f 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -14,15 +14,9 @@
   config.consider_all_requests_local       = false
   config.action_controller.perform_caching = true
 
-  # Enable Rack::Cache to put a simple HTTP cache in front of your application
-  # Add `rack-cache` to your Gemfile before enabling this.
-  # For large-scale production use, consider using a caching reverse proxy like
-  # NGINX, varnish or squid.
-  # config.action_dispatch.rack_cache = true
-
   # Disable serving static files from the `/public` folder by default since
   # Apache or NGINX already handles this.
-  config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present?
+  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
 
   # Compress JavaScripts and CSS.
   config.assets.js_compressor = :uglifier
@@ -31,16 +25,20 @@
   # Do not fallback to assets pipeline if a precompiled asset is missed.
   config.assets.compile = false
 
-  # Asset digests allow you to set far-future HTTP expiration dates on all assets,
-  # yet still be able to expire them through the digest params.
-  config.assets.digest = true
-
   # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
 
+  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
+  # config.action_controller.asset_host = 'http://assets.example.com'
+
   # Specifies the header that your server uses for sending files.
   # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
   # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
 
+  # Mount Action Cable outside main process or domain
+  # config.action_cable.mount_path = nil
+  # config.action_cable.url = 'wss://example.com/cable'
+  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http:\/\/example.*/ ]
+
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   config.force_ssl = true
 
@@ -49,16 +47,15 @@
   config.log_level = :debug
 
   # Prepend all log lines with the following tags.
-  # config.log_tags = [ :subdomain, :uuid ]
-
-  # Use a different logger for distributed setups.
-  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
+  config.log_tags = [ :request_id ]
 
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store
 
-  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
-  # config.action_controller.asset_host = 'http://assets.example.com'
+  # 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 = "coderdojo_jp_#{Rails.env}"
+  config.action_mailer.perform_caching = false
 
   # Ignore bad email addresses and do not raise email delivery errors.
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
@@ -74,6 +71,16 @@
   # Use default logging formatter so that PID and timestamp are not suppressed.
   config.log_formatter = ::Logger::Formatter.new
 
+  # Use a different logger for distributed setups.
+  # require 'syslog/logger'
+  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
+
+  if ENV["RAILS_LOG_TO_STDOUT"].present?
+    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger.formatter = config.log_formatter
+    config.logger    = ActiveSupport::TaggedLogging.new(logger)
+  end
+
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 1c19f08b2..30587ef6d 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -12,9 +12,11 @@
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
-  # Configure static file server for tests with Cache-Control for performance.
-  config.serve_static_files   = true
-  config.static_cache_control = 'public, max-age=3600'
+  # 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=3600'
+  }
 
   # Show full error reports and disable caching.
   config.consider_all_requests_local       = true
@@ -25,15 +27,13 @@
 
   # Disable request forgery protection in test environment.
   config.action_controller.allow_forgery_protection = false
+  config.action_mailer.perform_caching = false
 
   # Tell Action Mailer not to deliver emails to the real world.
   # The :test delivery method accumulates sent emails in the
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
-  # Randomize the order test cases are executed.
-  config.active_support.test_order = :random
-
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr
 
diff --git a/config/initializers/application_controller_renderer.rb b/config/initializers/application_controller_renderer.rb
new file mode 100644
index 000000000..51639b67a
--- /dev/null
+++ b/config/initializers/application_controller_renderer.rb
@@ -0,0 +1,6 @@
+# Be sure to restart your server when you modify this file.
+
+# ApplicationController.renderer.defaults.merge!(
+#   http_host: 'example.org',
+#   https: false
+# )
diff --git a/config/initializers/cookies_serializer.rb b/config/initializers/cookies_serializer.rb
index 7f70458de..5a6a32d37 100644
--- a/config/initializers/cookies_serializer.rb
+++ b/config/initializers/cookies_serializer.rb
@@ -1,3 +1,5 @@
 # Be sure to restart your server when you modify this file.
 
+# Specify a serializer for the signed and encrypted cookie jars.
+# Valid options are :json, :marshal, and :hybrid.
 Rails.application.config.action_dispatch.cookies_serializer = :json
diff --git a/config/initializers/new_framework_defaults.rb b/config/initializers/new_framework_defaults.rb
new file mode 100644
index 000000000..829206f09
--- /dev/null
+++ b/config/initializers/new_framework_defaults.rb
@@ -0,0 +1,23 @@
+# Be sure to restart your server when you modify this file.
+#
+# This file contains migration options to ease your Rails 5.0 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.
+
+# Enable per-form CSRF tokens. Previous versions had false.
+Rails.application.config.action_controller.per_form_csrf_tokens = false
+
+# Enable origin-checking CSRF mitigation. Previous versions had false.
+Rails.application.config.action_controller.forgery_protection_origin_check = false
+
+# Make Ruby 2.4 preserve the timezone of the receiver when calling `to_time`.
+# Previous versions had false.
+ActiveSupport.to_time_preserves_timezone = true
+
+# Require `belongs_to` associations by default. Previous versions had false.
+Rails.application.config.active_record.belongs_to_required_by_default = false
+
+# Do not halt callback chains when a callback returns false. Previous versions had true.
+ActiveSupport.halt_callback_chains_on_return_false = true
diff --git a/config/initializers/wrap_parameters.rb b/config/initializers/wrap_parameters.rb
index 33725e95f..bbfc3961b 100644
--- a/config/initializers/wrap_parameters.rb
+++ b/config/initializers/wrap_parameters.rb
@@ -5,10 +5,10 @@
 
 # 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] if respond_to?(:wrap_parameters)
+  wrap_parameters format: [:json]
 end
 
 # To enable root element in JSON for ActiveRecord objects.
 # ActiveSupport.on_load(:active_record) do
-#  self.include_root_in_json = true
+#   self.include_root_in_json = true
 # end
diff --git a/config/puma.rb b/config/puma.rb
new file mode 100644
index 000000000..c7f311f81
--- /dev/null
+++ b/config/puma.rb
@@ -0,0 +1,47 @@
+# 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
+# the maximum value specified for Puma. Default is set to 5 threads for minimum
+# and maximum, this matches the default thread size of Active Record.
+#
+threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }.to_i
+threads threads_count, threads_count
+
+# Specifies the `port` that Puma will listen on to receive requests, default is 3000.
+#
+port        ENV.fetch("PORT") { 3000 }
+
+# Specifies the `environment` that Puma will run in.
+#
+environment ENV.fetch("RAILS_ENV") { "development" }
+
+# 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`.
+# Workers do not work on JRuby or Windows (both of which do not support
+# processes).
+#
+# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
+
+# 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.
+#
+# preload_app!
+
+# 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 `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, 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/secrets.yml b/config/secrets.yml
index 552ec3d24..2ab5b3eb9 100644
--- a/config/secrets.yml
+++ b/config/secrets.yml
@@ -5,7 +5,7 @@
 
 # Make sure the secret is at least 30 characters and all random,
 # no regular words or you'll be exposed to dictionary attacks.
-# You can use `rake secret` to generate a secure secret key.
+# You can use `rails secret` to generate a secure secret key.
 
 # Make sure the secrets in this file are kept private
 # if you're sharing your code publicly.
diff --git a/config/spring.rb b/config/spring.rb
new file mode 100644
index 000000000..c9119b40c
--- /dev/null
+++ b/config/spring.rb
@@ -0,0 +1,6 @@
+%w(
+  .ruby-version
+  .rbenv-vars
+  tmp/restart.txt
+  tmp/caching-dev.txt
+).each { |path| Spring.watch(path) }
diff --git a/test/integration/users_login_test.rb b/test/integration/users_login_test.rb
index bd9b6852e..7fb0705f1 100644
--- a/test/integration/users_login_test.rb
+++ b/test/integration/users_login_test.rb
@@ -10,7 +10,7 @@ def setup
   test "login with invalid information" do
     get @login_path
     assert_template 'login_page/index'
-    post session_path, { email: "", password: "" }
+    post session_path, params: { email: "", password: "" }
     assert_redirected_to @login_path
     assert_not flash.empty?
     get @login_path
@@ -19,8 +19,8 @@ def setup
 
   test "login with valid information" do
     get @login_path
-    post session_path, { email:    ENV['SCRIVITO_EMAIL'],
-                         password: ENV["SCRIVITO_PASSWORD"] }
+    post session_path, params: { email:    ENV['SCRIVITO_EMAIL'],
+                                 password: ENV["SCRIVITO_PASSWORD"] }
     assert_redirected_to scrivito_path(Obj.root)
     assert_equal session[:user] , ENV['SCRIVITO_EMAIL']
     follow_redirect!
@@ -31,8 +31,8 @@ def setup
     test_url = "/kata"
     get test_url
     get @login_path
-    post session_path, { email:    ENV['SCRIVITO_EMAIL'],
-                         password: ENV["SCRIVITO_PASSWORD"] }
+    post session_path, params: { email:    ENV['SCRIVITO_EMAIL'],
+                                 password: ENV["SCRIVITO_PASSWORD"] }
     assert_redirected_to test_url
     follow_redirect!
     # assert_template "blog_post_page/index.html"