diff --git a/app/controllers/admin/application_controller.rb b/app/controllers/admin/application_controller.rb
index 65f65649..c14aa51b 100644
--- a/app/controllers/admin/application_controller.rb
+++ b/app/controllers/admin/application_controller.rb
@@ -10,13 +10,13 @@ module Admin
 
     def authenticate_admin
       unless user_signed_in?
-        flash[:alert] = "You must be logged in to access this page."
+        flash[:alert] = 'You must be logged in to access this page.'
         redirect_to new_user_session_path
         return
       end
 
       unless current_user.moderator? || current_user.admin?
-        flash[:alert] = "You do not have the privilegies to access this page."
+        flash[:alert] = 'You do not have the privilegies to access this page.'
         redirect_to root_path
         return
       end
diff --git a/app/controllers/admin/users_controller.rb b/app/controllers/admin/users_controller.rb
index 5f562236..25f55006 100644
--- a/app/controllers/admin/users_controller.rb
+++ b/app/controllers/admin/users_controller.rb
@@ -33,13 +33,13 @@ module Admin
 
     def authenticate_admin
       unless user_signed_in?
-        flash[:alert] = "You must be logged in to access this page."
+        flash[:alert] = 'You must be logged in to access this page.'
         redirect_to new_user_session_path
         return
       end
 
       unless current_user.admin?
-        flash[:alert] = "You do not have the privilegies to access this page."
+        flash[:alert] = 'You do not have the privilegies to access this page.'
         redirect_to root_path
         return
       end
@@ -51,7 +51,7 @@ module Admin
       user.skip_confirmation! # automatically confirm user email
 
       if user.save
-        flash[:notice] = translate_with_resource("create.success")
+        flash[:notice] = translate_with_resource('create.success')
         redirect_to admin_user_path(user)
       else
         render :new, locals: {
@@ -73,7 +73,7 @@ module Admin
       user.skip_reconfirmation! # automatically reconfirm user email
       
       if user.save
-        flash[:notice] = translate_with_resource("update.success")
+        flash[:notice] = translate_with_resource('update.success')
         redirect_to admin_user_path(user)
       else
         render :new, locals: {
diff --git a/app/views/fields/color_field/_form.html.erb b/app/views/fields/color_field/_form.html.erb
index b0955f5b..a8cfadbc 100644
--- a/app/views/fields/color_field/_form.html.erb
+++ b/app/views/fields/color_field/_form.html.erb
@@ -2,5 +2,5 @@
   <%= f.label field.attribute %>
 </div>
 <div class="field-unit__field">
-  <%= f.color_field field.attribute, style: "height: 40px" %>
+  <%= f.color_field field.attribute, style: 'height: 40px;' %>
 </div>
diff --git a/app/views/fields/color_field/_index.html.erb b/app/views/fields/color_field/_index.html.erb
index 01c73697..986637f7 100644
--- a/app/views/fields/color_field/_index.html.erb
+++ b/app/views/fields/color_field/_index.html.erb
@@ -1 +1,3 @@
-<div style="background-color: <%= field.to_s %>; width: 32px; height: 32px; border-radius: 32px;"></div>
+<div
+  style="background-color: <%= field.to_s %>; width: 32px; height: 32px; border-radius: 32px;">
+</div>
diff --git a/app/views/fields/color_field/_show.html.erb b/app/views/fields/color_field/_show.html.erb
index 00d85674..50a791a3 100644
--- a/app/views/fields/color_field/_show.html.erb
+++ b/app/views/fields/color_field/_show.html.erb
@@ -1,2 +1,4 @@
-<div style="background-color: <%= field.to_s %>; width: 32px; height: 32px; border-radius: 32px;"></div>
+<div
+  style="background-color: <%= field.to_s %>; width: 32px; height: 32px; border-radius: 32px;">
+</div>
 (<%= field.to_s %>)
\ No newline at end of file
diff --git a/app/views/layouts/_boards_menu_section.html.erb b/app/views/layouts/_boards_menu_section.html.erb
index abae5c41..1d4423f2 100644
--- a/app/views/layouts/_boards_menu_section.html.erb
+++ b/app/views/layouts/_boards_menu_section.html.erb
@@ -1,5 +1,5 @@
 <% boards.each do |board| %>
   <li class="nav-item<%= board.id == @board.id ? ' active' : '' unless @board.nil? %>">
-    <%= link_to board.name, board_path(board), class: "nav-link" %>
+    <%= link_to board.name, board_path(board), class: 'nav-link' %>
   </li>
 <% end %>
\ No newline at end of file
diff --git a/app/views/layouts/_header.html.erb b/app/views/layouts/_header.html.erb
index b27ae583..ec2bf40d 100644
--- a/app/views/layouts/_header.html.erb
+++ b/app/views/layouts/_header.html.erb
@@ -1,35 +1,35 @@
 <nav class="navbar navbar-expand-lg navbar-light">
   <div class="container">
-    <%= link_to "Astuto", root_path, class: "navbar-brand" %>
+    <%= link_to 'Astuto', root_path, class: 'navbar-brand' %>
     <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
       <span class="navbar-toggler-icon"></span>
     </button>
 
     <div class="collapse navbar-collapse" id="navbarSupportedContent">
       <ul class="navbar-nav nav-pills mr-auto">
-        <%= render "layouts/boards_menu_section", boards: @boards unless @boards.nil? %>
+        <%= render 'layouts/boards_menu_section', boards: @boards unless @boards.nil? %>
       </ul>
       <ul class="navbar-nav ml-auto">
         <% if user_signed_in? %>
           <% if current_user.moderator? || current_user.admin? %>
             <li class="nav-item">
-              <%= link_to "Admin Panel", admin_root_path, class: "nav-link", 'data-turbolinks': 'false' %>
+              <%= link_to 'Admin Panel', admin_root_path, class: 'nav-link', 'data-turbolinks': 'false' %>
             </li>
           <% end %>
           <li class="nav-item dropdown">
             <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-              <%= image_tag(current_user.gravatar_url, class: "gravatar", alt: current_user.full_name, size: 24) %>
+              <%= image_tag(current_user.gravatar_url, class: 'gravatar', alt: current_user.full_name, size: 24) %>
               <span class="fullname"><%= current_user.full_name %></span>
             </a>
             <div class="dropdown-menu" aria-labelledby="navbarDropdown">
-              <%= link_to "Profile settings", edit_user_registration_path, class: "dropdown-item" %>
+              <%= link_to 'Profile settings', edit_user_registration_path, class: 'dropdown-item' %>
               <div class="dropdown-divider"></div>
-              <%= link_to "Sign out", destroy_user_session_path, method: :delete, class: "dropdown-item" %>
+              <%= link_to 'Sign out', destroy_user_session_path, method: :delete, class: 'dropdown-item' %>
             </div>
           </li>
         <% else %>
           <li class="nav-item">
-            <%= link_to "Sign in / Sign up", new_user_session_path, class: "nav-link" %>
+            <%= link_to 'Sign in / Sign up', new_user_session_path, class: 'nav-link' %>
           </li>
         <% end %>
       </ul>
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index cb795356..d3150376 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -10,8 +10,8 @@
   </head>
 
   <body>
-    <%= render "layouts/header" %>
-    <%= render "layouts/alerts" %>
+    <%= render 'layouts/header' %>
+    <%= render 'layouts/alerts' %>
     
     <div class="container">
       <%= yield %>
diff --git a/config/routes.rb b/config/routes.rb
index f9c77e1f..6c276afd 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -2,7 +2,7 @@ Rails.application.routes.draw do
   root to: 'static_pages#home'
 
   namespace :admin do
-    root to: "boards#index"
+    root to: 'boards#index'
 
     resources :boards
     resources :post_statuses
diff --git a/spec/factories/boards.rb b/spec/factories/boards.rb
index 4a29d395..f5282239 100644
--- a/spec/factories/boards.rb
+++ b/spec/factories/boards.rb
@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory :board do
     sequence(:name) { |n| "Board#{n}" }
-    description { "My fantastic board" }
+    description { 'My fantastic board' }
   end
 end
diff --git a/spec/factories/post_statuses.rb b/spec/factories/post_statuses.rb
index 209dc666..409d017f 100644
--- a/spec/factories/post_statuses.rb
+++ b/spec/factories/post_statuses.rb
@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory :post_status do
     sequence(:name) { |n| "Post Status #{n}" }
-    color { "#ffffff" }
+    color { '#ffffff' }
   end
 end
diff --git a/spec/factories/posts.rb b/spec/factories/posts.rb
index 89b39e4b..354e1efc 100644
--- a/spec/factories/posts.rb
+++ b/spec/factories/posts.rb
@@ -1,7 +1,7 @@
 FactoryBot.define do
   factory :post do
-    title { "Post Title" }
-    description { "Post Description" }
+    title { 'Post Title' }
+    description { 'Post Description' }
     board
     user
     post_status
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
index f1dde099..a47f4030 100644
--- a/spec/factories/users.rb
+++ b/spec/factories/users.rb
@@ -2,23 +2,23 @@ FactoryBot.define do
   factory :user do
     sequence(:email) { |n| "user#{n}@example.com" }
     
-    full_name { "First Last" }
-    password { "password" }
+    full_name { 'First Last' }
+    password { 'password' }
   end
 
   factory :moderator, class: User do
     sequence(:email) { |n| "mod#{n}@example.com" }
     
-    full_name { "First Last" }
-    password { "password" }
-    role { "moderator" }
+    full_name { 'First Last' }
+    password { 'password' }
+    role { 'moderator' }
   end
 
   factory :admin, class: User do
     sequence(:email) { |n| "admin#{n}@example.com" }
     
-    full_name { "First Last" }
-    password { "password" }
-    role { "admin" }
+    full_name { 'First Last' }
+    password { 'password' }
+    role { 'admin' }
   end
 end
diff --git a/spec/models/board_spec.rb b/spec/models/board_spec.rb
index c6493a02..a06a35e1 100644
--- a/spec/models/board_spec.rb
+++ b/spec/models/board_spec.rb
@@ -9,7 +9,7 @@ RSpec.describe Board, type: :model do
 
   it 'has a non-nil and non-empty name' do
     nil_name_board = FactoryBot.build(:board, name: nil)
-    empty_name_board = FactoryBot.build(:board, name: "")
+    empty_name_board = FactoryBot.build(:board, name: '')
 
     expect(nil_name_board).to be_invalid
     expect(empty_name_board).to be_invalid
@@ -24,7 +24,7 @@ RSpec.describe Board, type: :model do
 
   it 'has a description that can be nil or empty' do
     nil_description_board = FactoryBot.build(:board, description: nil)
-    empty_description_board = FactoryBot.build(:board, description: "")
+    empty_description_board = FactoryBot.build(:board, description: '')
 
     expect(nil_description_board).to be_valid
     expect(empty_description_board).to be_valid
diff --git a/spec/models/post_spec.rb b/spec/models/post_spec.rb
index 21d95cd2..0eb9e75e 100644
--- a/spec/models/post_spec.rb
+++ b/spec/models/post_spec.rb
@@ -9,17 +9,17 @@ RSpec.describe Post, type: :model do
 
   it 'has a non-nil and non-empty title' do
     nil_post = FactoryBot.build(:post, title: nil)
-    empty_post = FactoryBot.build(:post, title: "")
+    empty_post = FactoryBot.build(:post, title: '')
 
     expect(nil_post).to be_invalid
     expect(empty_post).to be_invalid
   end
 
   it 'has a title between 4 and 64 characters' do
-    too_short_post = FactoryBot.build(:post, title: "a" * 3)
-    short_post = FactoryBot.build(:post, title: "a" * 4)
-    long_post = FactoryBot.build(:post, title: "a" * 64)
-    too_long_post = FactoryBot.build(:post, title: "a" * 65)
+    too_short_post = FactoryBot.build(:post, title: 'a' * 3)
+    short_post = FactoryBot.build(:post, title: 'a' * 4)
+    long_post = FactoryBot.build(:post, title: 'a' * 64)
+    too_long_post = FactoryBot.build(:post, title: 'a' * 65)
 
     expect(too_short_post).to be_invalid
     expect(short_post).to be_valid
@@ -29,7 +29,7 @@ RSpec.describe Post, type: :model do
 
   it 'has a description that can be nil or empty' do
     nil_description_post = FactoryBot.build(:post, description: nil)
-    empty_description_post = FactoryBot.build(:post, description: "")
+    empty_description_post = FactoryBot.build(:post, description: '')
 
     expect(nil_description_post).to be_valid
     expect(empty_description_post).to be_valid
diff --git a/spec/models/post_status_spec.rb b/spec/models/post_status_spec.rb
index 19c30fd6..48e798e7 100644
--- a/spec/models/post_status_spec.rb
+++ b/spec/models/post_status_spec.rb
@@ -8,7 +8,7 @@ RSpec.describe PostStatus, type: :model do
   end
 
   it 'must have a name' do
-    empty_name = FactoryBot.build(:post_status, name: "")
+    empty_name = FactoryBot.build(:post_status, name: '')
     nil_name = FactoryBot.build(:post_status, name: nil)
 
     expect(empty_name).to be_invalid
@@ -23,11 +23,11 @@ RSpec.describe PostStatus, type: :model do
 
   it 'has a valid hex color' do
     nil_color = FactoryBot.build(:post_status, color: nil)
-    empty_color = FactoryBot.build(:post_status, color: "")
-    invalid_color = FactoryBot.build(:post_status, color: "ffffff")
-    invalid_color2 = FactoryBot.build(:post_status, color: "#ffff")
-    valid_color = FactoryBot.build(:post_status, color: "#fff")
-    valid_color2 = FactoryBot.build(:post_status, color: "#ffffff")
+    empty_color = FactoryBot.build(:post_status, color: '')
+    invalid_color = FactoryBot.build(:post_status, color: 'ffffff')
+    invalid_color2 = FactoryBot.build(:post_status, color: '#ffff')
+    valid_color = FactoryBot.build(:post_status, color: '#fff')
+    valid_color2 = FactoryBot.build(:post_status, color: '#ffffff')
 
     expect(nil_color).to be_invalid
     expect(empty_color).to be_invalid
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 3fe49bfc..49f9685d 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -8,7 +8,7 @@ RSpec.describe User, type: :model do
   end
 
   it 'creates a user with role "user" by default' do
-    expect(User.new.role).to eq("user")
+    expect(User.new.role).to eq('user')
   end
 
   it 'can have the following roles: "user", "moderator" and "admin"' do
@@ -16,9 +16,9 @@ RSpec.describe User, type: :model do
     moderator = FactoryBot.build(:moderator)
     admin = FactoryBot.build(:admin)
 
-    expect(user.role).to eq("user")
-    expect(moderator.role).to eq("moderator")
-    expect(admin.role).to eq("admin")
+    expect(user.role).to eq('user')
+    expect(moderator.role).to eq('moderator')
+    expect(admin.role).to eq('admin')
 
     expect(user).to be_valid
     expect(moderator).to be_valid
@@ -27,17 +27,17 @@ RSpec.describe User, type: :model do
 
   it 'has a non-nil and non-empty full name' do
     nil_name_user = FactoryBot.build(:user, full_name: nil)
-    empty_name_user = FactoryBot.build(:user, full_name: "")
+    empty_name_user = FactoryBot.build(:user, full_name: '')
 
     expect(nil_name_user).to be_invalid
     expect(empty_name_user).to be_invalid
   end
 
   it 'has a full name between 2 and 32 characters' do
-    too_short_user = FactoryBot.build(:user, full_name: "a" * 1)
-    short_user = FactoryBot.build(:user, full_name: "a" * 2)
-    long_user = FactoryBot.build(:user, full_name: "a" * 32)
-    too_long_user = FactoryBot.build(:user, full_name: "a" * 33)
+    too_short_user = FactoryBot.build(:user, full_name: 'a' * 1)
+    short_user = FactoryBot.build(:user, full_name: 'a' * 2)
+    long_user = FactoryBot.build(:user, full_name: 'a' * 32)
+    too_long_user = FactoryBot.build(:user, full_name: 'a' * 33)
     
     expect(too_short_user).to be_invalid
     expect(short_user).to be_valid
@@ -46,7 +46,7 @@ RSpec.describe User, type: :model do
   end
 
   it 'has an email that must contain a @' do
-    invalid_email_user = FactoryBot.build(:user, email: "invalid.email")
+    invalid_email_user = FactoryBot.build(:user, email: 'invalid.email')
 
     expect(invalid_email_user).to be_invalid
   end