diff --git a/.rubocop.yml b/.rubocop.yml
index a42adca..f9765ba 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -45,10 +45,6 @@ Metrics/ClassLength:
     - 'app/models/site.rb'
     - 'app/controllers/posts_controller.rb'
 
-Performance/TimesMap:
-  Exclude:
-    - 'app/models/site.rb'
-
 Lint/HandleExceptions:
   Exclude:
     - 'app/controllers/posts_controller.rb'
diff --git a/Gemfile b/Gemfile
index dbf7ad1..3bf8e93 100644
--- a/Gemfile
+++ b/Gemfile
@@ -80,7 +80,7 @@ group :development do
   gem 'ed25519'
   gem 'letter_opener'
   gem 'rbnacl', '< 5.0'
-  gem 'rubocop'
+  gem 'rubocop-rails'
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index f9da67d..872f4c9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -159,7 +159,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jaro_winkler (1.5.2)
+    jaro_winkler (1.5.3)
     jbuilder (2.8.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
@@ -220,8 +220,8 @@ GEM
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
-    parallel (1.16.0)
-    parser (2.6.2.0)
+    parallel (1.17.0)
+    parser (2.6.3.0)
       ast (~> 2.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
@@ -229,7 +229,6 @@ GEM
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    psych (3.1.0)
     public_suffix (3.0.3)
     puma (3.12.1)
     pundit (2.0.1)
@@ -277,17 +276,19 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     rouge (3.3.0)
-    rubocop (0.66.0)
+    rubocop (0.72.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5, != 2.5.1.1)
-      psych (>= 3.1.0)
+      parser (>= 2.6)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 1.6)
+      unicode-display_width (>= 1.4.0, < 1.7)
+    rubocop-rails (2.2.0)
+      rack (>= 1.1)
+      rubocop (>= 0.72.0)
     ruby-enum (0.7.2)
       i18n
-    ruby-progressbar (1.10.0)
+    ruby-progressbar (1.10.1)
     ruby_dep (1.5.0)
     ruby_parser (3.13.1)
       sexp_processor (~> 4.9)
@@ -350,7 +351,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.5)
-    unicode-display_width (1.5.0)
+    unicode-display_width (1.6.0)
     validates_hostname (1.0.8)
       activerecord (>= 3.0)
       activesupport (>= 3.0)
@@ -411,7 +412,7 @@ DEPENDENCIES
   rails-i18n
   rails_warden
   rbnacl (< 5.0)
-  rubocop
+  rubocop-rails
   rugged
   sass-rails (~> 5.0)
   selenium-webdriver