diff --git a/Gemfile b/Gemfile
index 0e8070313..9a642b22b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,7 +35,7 @@ gem 'acts-as-taggable-on'
 gem "responders"
 gem 'foundation-rails'
 gem 'acts_as_votable'
-gem "recaptcha", :require => "recaptcha/rails"
+gem "recaptcha", require: "recaptcha/rails"
 gem 'ckeditor'
 
 group :development, :test do
diff --git a/app/views/debates/_debate.html.erb b/app/views/debates/_debate.html.erb
index 521b291b7..4253143a6 100644
--- a/app/views/debates/_debate.html.erb
+++ b/app/views/debates/_debate.html.erb
@@ -12,14 +12,14 @@
 		<div class="row votes">
         	<div class="small-8 column">
 
-	    		<%= link_to debate_votes_path(debate, value: 'yes'), :class => 'in-favor', method: "post" do %>
+	    		<%= link_to debate_votes_path(debate, value: 'yes'), class: 'in-favor', method: "post" do %>
 	    			<i class="fi-like"></i>
 	    			<span><%= percentage('likes', debate) %></span>
 	    		<% end %>
 
 	    		<span class="divider"></span>
 
-	    		<%= link_to debate_votes_path(debate, value: 'no'), :class => 'against', method: "post" do %>
+	    		<%= link_to debate_votes_path(debate, value: 'no'), class: 'against', method: "post" do %>
 	    			<i class="fi-dislike"></i>
 	    			<span><%= percentage('dislikes', debate) %></span>
 	    		<% end %>
diff --git a/app/views/debates/show.html.erb b/app/views/debates/show.html.erb
index b7aea88d1..f2c713103 100644
--- a/app/views/debates/show.html.erb
+++ b/app/views/debates/show.html.erb
@@ -1,6 +1,6 @@
 <article class="debate-show">
 
-    <%= link_to t("debates.show.back_link"), debates_path, :class => 'right' %>
+    <%= link_to t("debates.show.back_link"), debates_path, class: 'right' %>
 
     <div class="row">
         <div id="debate-<%= @debate.id %>" class="small-12 medium-9 column">
@@ -13,7 +13,7 @@
         <div class="votes small-12 medium-3 column">
             <div class="small-12 column text-center">
                 <div id="in_favor" class="inline-block">
-                    <%= link_to debate_votes_path(@debate, value: 'yes'), :class => 'in-favor', method: "post" do %>
+                    <%= link_to debate_votes_path(@debate, value: 'yes'), class: 'in-favor', method: "post" do %>
                         <i class="fi-like"></i>
                         <span><%= percentage('likes', @debate) %></span>
                     <% end %>
@@ -22,7 +22,7 @@
                 <span class="divider"></span>
 
                 <div id="against" class="inline-block">
-                    <%= link_to debate_votes_path(@debate, value: 'no'), :class => 'against', method: "post" do %>
+                    <%= link_to debate_votes_path(@debate, value: 'no'), class: 'against', method: "post" do %>
                         <i class="fi-dislike"></i>
                         <span><%= percentage('dislikes', @debate) %></span>
                     <% end %>
@@ -45,7 +45,7 @@
     </div>
 
     <% if current_user && @debate.editable_by?(current_user) %>
-        <%= link_to t("debates.show.edit_debate_link"), edit_debate_path(@debate), :class => 'button radius right' %>
+        <%= link_to t("debates.show.edit_debate_link"), edit_debate_path(@debate), class: 'button radius right' %>
     <% end %>
 
 </article>
diff --git a/app/views/layouts/_header.html.erb b/app/views/layouts/_header.html.erb
index 5098996ae..773bb1e46 100644
--- a/app/views/layouts/_header.html.erb
+++ b/app/views/layouts/_header.html.erb
@@ -14,7 +14,7 @@
 			<ul class="title-area">
 				<li class="name">
 					<%= link_to root_path do %>
-						<%= image_tag('header-logo-madrid.png', :class => 'left', :size => '96x96') %>
+						<%= image_tag('header-logo-madrid.png', class: 'left', size: '96x96') %>
 						<%= t("layouts.header.open_gov", open: "<strong>#{t('layouts.header.open')}</strong>").html_safe %> | <span><%= t("layouts.header.participation") %></span>
 					<% end %>
 				</li>
@@ -32,7 +32,7 @@
 			<div class="small-12 column text-center">
 				<h1><%= t("layouts.header.open_city") %></h1>
 				<h2><%= t("layouts.header.open_city_slogan") %></h2>
-				<%= link_to t("layouts.header.create_debate"), new_debate_path, :class => 'button radius' %>
+				<%= link_to t("layouts.header.create_debate"), new_debate_path, class: 'button radius' %>
 			</div>
 		</div>
 	<% end %>
diff --git a/db/migrate/20150718091702_acts_as_commentable_with_threading_migration.rb b/db/migrate/20150718091702_acts_as_commentable_with_threading_migration.rb
index 26edafbaf..977fc79df 100644
--- a/db/migrate/20150718091702_acts_as_commentable_with_threading_migration.rb
+++ b/db/migrate/20150718091702_acts_as_commentable_with_threading_migration.rb
@@ -6,7 +6,7 @@ class ActsAsCommentableWithThreadingMigration < ActiveRecord::Migration
       t.string :title
       t.text :body
       t.string :subject
-      t.integer :user_id, :null => false
+      t.integer :user_id, null: false
       t.integer :parent_id, :lft, :rgt
       t.timestamps
     end