diff --git a/.rubocop.yml b/.rubocop.yml
index 5537838..96da17d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,4 +1,6 @@
-require: rubocop-rspec
+require: 
+  - rubocop-rails
+  - rubocop-rspec
 
 AllCops:
   TargetRubyVersion: 2.5
@@ -15,7 +17,7 @@ AllCops:
     - '.git/**/*'
 
 IndentationConsistency:
-  EnforcedStyle: 'rails'
+  EnforcedStyle: 'indented_internal_methods'
 
 Naming/FileName:
   Exclude:
@@ -23,9 +25,6 @@ Naming/FileName:
     - 'Guardfile'
     - 'Rakefile'
 
-Rails:
-  Enabled: true
-
 Metrics/CyclomaticComplexity:
   Max: 15
 
diff --git a/Gemfile b/Gemfile
index 0632ae7..06fb50c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,59 +1,61 @@
-source 'https://rubygems.org'
 ruby '2.5.1'
 
+source 'https://rubygems.org'
+
 # app server
-gem 'rails', '~> 5.2.0'
+gem 'rails', '~> 5.2'
 
 # database
-gem 'pg'
+gem 'pg', '~> 1.2'
 
 # webserver
-gem 'puma'
+gem 'puma', '~> 3.12'
 
 # webserver
-gem 'microformats', '~> 4.0.7'
+gem 'microformats', '~> 4.2'
 
 # assets
-gem 'autoprefixer-rails'
-gem 'bootstrap'
-gem 'jquery-rails'
-gem 'sass-rails'
-gem 'uglifier'
+gem 'autoprefixer-rails', '~> 9.7'
+gem 'bootstrap', '~> 4.4'
+gem 'jquery-rails', '~> 4.3'
+gem 'sass-rails', '~> 5.1'
+gem 'uglifier', '~> 4.2'
 
 # For codestyle guide and linting
-gem 'rubocop', require: false
-gem 'rubocop-rspec'
+gem 'rubocop', '~> 0.82.0', require: false
+gem 'rubocop-rails', '~> 2.5', require: false
+gem 'rubocop-rspec', '~> 1.38', require: false
 
 # dev and testing
 group :development, :test do
-  gem 'byebug', platform: :mri
-  gem 'factory_bot_rails'
-  gem 'guard-rspec'
-  gem 'nokogiri'
-  gem 'rails-controller-testing'
-  gem 'rspec-rails'
-  gem 'simplecov', require: false
-  gem 'spring-commands-rspec'
+  gem 'byebug', '~> 10.0', platform: :mri
+  gem 'factory_bot_rails', '~> 5.1'
+  gem 'guard-rspec', '~> 4.7'
+  gem 'nokogiri', '~> 1.10'
+  gem 'rails-controller-testing', '~> 1.0'
+  gem 'rspec-rails', '~> 4.0'
+  gem 'simplecov', '~> 0.18.5', require: false
+  gem 'spring-commands-rspec', '~> 1.0'
 end
 
 # dev
 group :development do
-  gem 'listen', '~> 3.1.5'
-  gem 'spring'
-  gem 'spring-watcher-listen', '~> 2.0.0'
-  gem 'web-console'
+  gem 'listen', '~> 3.2'
+  gem 'spring', '~> 2.1'
+  gem 'spring-watcher-listen', '~> 2.0'
+  gem 'web-console', '~> 3.7'
 
   # For measuring page/code performance
-  gem 'rack-mini-profiler'
+  gem 'rack-mini-profiler', '~> 2.0'
 
   # For memory profiling
-  gem 'memory_profiler'
+  gem 'memory_profiler', '~> 0.9.14'
 
   # For call-stack profiling flamegraphs
-  gem 'fast_stack'
-  gem 'flamegraph'
-  gem 'stackprof'
+  gem 'fast_stack', '~> 0.2.0'
+  gem 'flamegraph', '~> 0.9.5'
+  gem 'stackprof', '~> 0.2.15'
 end
 
 # windows dev
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem 'tzinfo-data', '~> 1.2019', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
diff --git a/Gemfile.lock b/Gemfile.lock
index 8b9fa42..6bf191c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,77 +1,77 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.2.0)
-      actionpack (= 5.2.0)
+    actioncable (5.2.4.2)
+      actionpack (= 5.2.4.2)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-    actionmailer (5.2.0)
-      actionpack (= 5.2.0)
-      actionview (= 5.2.0)
-      activejob (= 5.2.0)
+    actionmailer (5.2.4.2)
+      actionpack (= 5.2.4.2)
+      actionview (= 5.2.4.2)
+      activejob (= 5.2.4.2)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 2.0)
-    actionpack (5.2.0)
-      actionview (= 5.2.0)
-      activesupport (= 5.2.0)
-      rack (~> 2.0)
+    actionpack (5.2.4.2)
+      actionview (= 5.2.4.2)
+      activesupport (= 5.2.4.2)
+      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 (5.2.0)
-      activesupport (= 5.2.0)
+    actionview (5.2.4.2)
+      activesupport (= 5.2.4.2)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.2.0)
-      activesupport (= 5.2.0)
+    activejob (5.2.4.2)
+      activesupport (= 5.2.4.2)
       globalid (>= 0.3.6)
-    activemodel (5.2.0)
-      activesupport (= 5.2.0)
-    activerecord (5.2.0)
-      activemodel (= 5.2.0)
-      activesupport (= 5.2.0)
+    activemodel (5.2.4.2)
+      activesupport (= 5.2.4.2)
+    activerecord (5.2.4.2)
+      activemodel (= 5.2.4.2)
+      activesupport (= 5.2.4.2)
       arel (>= 9.0)
-    activestorage (5.2.0)
-      actionpack (= 5.2.0)
-      activerecord (= 5.2.0)
+    activestorage (5.2.4.2)
+      actionpack (= 5.2.4.2)
+      activerecord (= 5.2.4.2)
       marcel (~> 0.3.1)
-    activesupport (5.2.0)
+    activesupport (5.2.4.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (9.0.0)
     ast (2.4.0)
-    autoprefixer-rails (9.1.0)
+    autoprefixer-rails (9.7.6)
       execjs
-    bindex (0.5.0)
-    bootstrap (4.1.3)
-      autoprefixer-rails (>= 6.0.3)
-      popper_js (>= 1.12.9, < 2)
-      sass (>= 3.5.2)
-    builder (3.2.3)
+    bindex (0.8.1)
+    bootstrap (4.4.1)
+      autoprefixer-rails (>= 9.1.0)
+      popper_js (>= 1.14.3, < 2)
+      sassc-rails (>= 2.0.0)
+    builder (3.2.4)
     byebug (10.0.2)
     coderay (1.1.2)
-    concurrent-ruby (1.0.5)
-    crass (1.0.4)
+    concurrent-ruby (1.1.6)
+    crass (1.0.6)
     diff-lcs (1.3)
-    docile (1.3.1)
-    erubi (1.7.1)
+    docile (1.3.2)
+    erubi (1.9.0)
     execjs (2.7.0)
-    factory_bot (4.10.0)
-      activesupport (>= 3.0.0)
-    factory_bot_rails (4.10.0)
-      factory_bot (~> 4.10.0)
-      railties (>= 3.0.0)
+    factory_bot (5.1.2)
+      activesupport (>= 4.2.0)
+    factory_bot_rails (5.1.1)
+      factory_bot (~> 5.1.0)
+      railties (>= 4.2.0)
     fast_stack (0.2.0)
-    ffi (1.9.25)
+    ffi (1.12.2)
     flamegraph (0.9.5)
     formatador (0.2.5)
-    globalid (0.4.1)
+    globalid (0.4.2)
       activesupport (>= 4.2.0)
-    guard (2.14.2)
+    guard (2.16.2)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       lumberjack (>= 1.0.12, < 2.0)
@@ -85,142 +85,150 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
-    i18n (1.0.1)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
-    jaro_winkler (1.5.1)
-    jquery-rails (4.3.3)
+    jaro_winkler (1.5.4)
+    jquery-rails (4.3.5)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (2.1.0)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
-    loofah (2.2.2)
+    json (2.3.0)
+    listen (3.2.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    loofah (2.5.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    lumberjack (1.0.13)
-    mail (2.7.0)
+    lumberjack (1.2.4)
+    mail (2.7.1)
       mini_mime (>= 0.1.1)
-    marcel (0.3.2)
+    marcel (0.3.3)
       mimemagic (~> 0.3.2)
-    memory_profiler (0.9.11)
-    method_source (0.9.0)
-    microformats (4.0.7)
-      json
-      nokogiri
-    mimemagic (0.3.2)
-    mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
-    minitest (5.11.3)
+    memory_profiler (0.9.14)
+    method_source (1.0.0)
+    microformats (4.2.0)
+      json (~> 2.2)
+      nokogiri (~> 1.10)
+    mimemagic (0.3.4)
+    mini_mime (1.0.2)
+    mini_portile2 (2.4.0)
+    minitest (5.14.0)
     nenv (0.3.0)
-    nio4r (2.3.1)
-    nokogiri (1.8.4)
-      mini_portile2 (~> 2.3.0)
-    notiffany (0.1.1)
+    nio4r (2.5.2)
+    nokogiri (1.10.9)
+      mini_portile2 (~> 2.4.0)
+    notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    parallel (1.12.1)
-    parser (2.5.1.2)
+    parallel (1.19.1)
+    parser (2.7.1.1)
       ast (~> 2.4.0)
-    pg (1.0.0)
-    popper_js (1.14.3)
-    powerpack (0.1.2)
-    pry (0.11.3)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
-    puma (3.12.0)
-    rack (2.0.5)
-    rack-mini-profiler (1.0.0)
+    pg (1.2.3)
+    popper_js (1.16.0)
+    pry (0.13.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    puma (3.12.4)
+    rack (2.2.2)
+    rack-mini-profiler (2.0.1)
       rack (>= 1.2.0)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    rails (5.2.0)
-      actioncable (= 5.2.0)
-      actionmailer (= 5.2.0)
-      actionpack (= 5.2.0)
-      actionview (= 5.2.0)
-      activejob (= 5.2.0)
-      activemodel (= 5.2.0)
-      activerecord (= 5.2.0)
-      activestorage (= 5.2.0)
-      activesupport (= 5.2.0)
+    rails (5.2.4.2)
+      actioncable (= 5.2.4.2)
+      actionmailer (= 5.2.4.2)
+      actionpack (= 5.2.4.2)
+      actionview (= 5.2.4.2)
+      activejob (= 5.2.4.2)
+      activemodel (= 5.2.4.2)
+      activerecord (= 5.2.4.2)
+      activestorage (= 5.2.4.2)
+      activesupport (= 5.2.4.2)
       bundler (>= 1.3.0)
-      railties (= 5.2.0)
+      railties (= 5.2.4.2)
       sprockets-rails (>= 2.0.0)
-    rails-controller-testing (1.0.2)
-      actionpack (~> 5.x, >= 5.0.1)
-      actionview (~> 5.x, >= 5.0.1)
-      activesupport (~> 5.x)
+    rails-controller-testing (1.0.4)
+      actionpack (>= 5.0.1.x)
+      actionview (>= 5.0.1.x)
+      activesupport (>= 5.0.1.x)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.4)
-      loofah (~> 2.2, >= 2.2.2)
-    railties (5.2.0)
-      actionpack (= 5.2.0)
-      activesupport (= 5.2.0)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (5.2.4.2)
+      actionpack (= 5.2.4.2)
+      activesupport (= 5.2.4.2)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+      thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
-    rake (12.3.1)
+    rake (13.0.1)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.0)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rexml (3.2.4)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.1)
+      rspec-support (~> 3.9.1)
+    rspec-expectations (3.9.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-rails (3.8.0)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
-    rubocop (0.58.2)
+      rspec-support (~> 3.9.0)
+    rspec-rails (4.0.0)
+      actionpack (>= 4.2)
+      activesupport (>= 4.2)
+      railties (>= 4.2)
+      rspec-core (~> 3.9)
+      rspec-expectations (~> 3.9)
+      rspec-mocks (~> 3.9)
+      rspec-support (~> 3.9)
+    rspec-support (3.9.2)
+    rubocop (0.82.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      powerpack (~> 0.1)
+      parser (>= 2.7.0.1)
       rainbow (>= 2.2.2, < 4.0)
+      rexml
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    rubocop-rspec (1.27.0)
-      rubocop (>= 0.56.0)
-    ruby-progressbar (1.9.0)
-    ruby_dep (1.5.0)
-    sass (3.5.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-rails (2.5.2)
+      activesupport
+      rack (>= 1.1)
+      rubocop (>= 0.72.0)
+    rubocop-rspec (1.38.1)
+      rubocop (>= 0.68.1)
+    ruby-progressbar (1.10.1)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sass-rails (5.0.7)
-      railties (>= 4.0.0, < 6)
+    sass-rails (5.1.0)
+      railties (>= 5.2.0)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.3.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     shellany (0.0.1)
-    simplecov (0.16.1)
+    simplecov (0.18.5)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
-    spring (2.0.2)
-      activesupport (>= 4.2)
+      simplecov-html (~> 0.11)
+    simplecov-html (0.12.2)
+    spring (2.1.0)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-watcher-listen (2.0.1)
@@ -233,57 +241,58 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    stackprof (0.2.12)
-    thor (0.20.0)
+    stackprof (0.2.15)
+    thor (1.0.1)
     thread_safe (0.3.6)
-    tilt (2.0.8)
-    tzinfo (1.2.5)
+    tilt (2.0.10)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
-    uglifier (4.1.17)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (1.4.0)
-    web-console (3.6.2)
+    unicode-display_width (1.7.0)
+    web-console (3.7.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
       bindex (>= 0.4.0)
       railties (>= 5.0)
-    websocket-driver (0.7.0)
+    websocket-driver (0.7.1)
       websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
+    websocket-extensions (0.1.4)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  autoprefixer-rails
-  bootstrap
-  byebug
-  factory_bot_rails
-  fast_stack
-  flamegraph
-  guard-rspec
-  jquery-rails
-  listen (~> 3.1.5)
-  memory_profiler
-  microformats (~> 4.0.7)
-  nokogiri
-  pg
-  puma
-  rack-mini-profiler
-  rails (~> 5.2.0)
-  rails-controller-testing
-  rspec-rails
-  rubocop
-  rubocop-rspec
-  sass-rails
-  simplecov
-  spring
-  spring-commands-rspec
-  spring-watcher-listen (~> 2.0.0)
-  stackprof
-  tzinfo-data
-  uglifier
-  web-console
+  autoprefixer-rails (~> 9.7)
+  bootstrap (~> 4.4)
+  byebug (~> 10.0)
+  factory_bot_rails (~> 5.1)
+  fast_stack (~> 0.2.0)
+  flamegraph (~> 0.9.5)
+  guard-rspec (~> 4.7)
+  jquery-rails (~> 4.3)
+  listen (~> 3.2)
+  memory_profiler (~> 0.9.14)
+  microformats (~> 4.2)
+  nokogiri (~> 1.10)
+  pg (~> 1.2)
+  puma (~> 3.12)
+  rack-mini-profiler (~> 2.0)
+  rails (~> 5.2)
+  rails-controller-testing (~> 1.0)
+  rspec-rails (~> 4.0)
+  rubocop (~> 0.82.0)
+  rubocop-rails (~> 2.5)
+  rubocop-rspec (~> 1.38)
+  sass-rails (~> 5.1)
+  simplecov (~> 0.18.5)
+  spring (~> 2.1)
+  spring-commands-rspec (~> 1.0)
+  spring-watcher-listen (~> 2.0)
+  stackprof (~> 0.2.15)
+  tzinfo-data (~> 1.2019)
+  uglifier (~> 4.2)
+  web-console (~> 3.7)
 
 RUBY VERSION
    ruby 2.5.1p57
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 5e3eb42..5187e22 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -13,7 +13,7 @@
   config.consider_all_requests_local = true
 
   # Enable/disable caching. By default caching is disabled.
-  if Rails.root.join('tmp', 'caching-dev.txt').exist?
+  if Rails.root.join('tmp/caching-dev.txt').exist?
     config.action_controller.perform_caching = true
 
     config.cache_store = :memory_store
diff --git a/spec/factories/submissions.rb b/spec/factories/submissions.rb
index acfc922..21761bf 100644
--- a/spec/factories/submissions.rb
+++ b/spec/factories/submissions.rb
@@ -1,9 +1,9 @@
 FactoryBot.define do
   factory :submission do
-    url 'MyText'
-    html 'MyText'
-    base_url 'MyText'
-    save_html false
-    render_html_in_page false
+    url { 'MyText' }
+    html { 'MyText' }
+    base_url { 'MyText' }
+    save_html { false }
+    render_html_in_page { false }
   end
 end