diff --git a/Gemfile b/Gemfile
index 1ab04d2..1568223 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,19 +2,19 @@ source 'https://rubygems.org'
 ruby '1.9.3'
 #ruby-gemset=railstutorial_rails_4_0
 
-gem 'rails', '4.0.2'
+gem 'rails', '5.2.4.3'
 
 group :development do
   gem 'sqlite3', '1.3.8'
 end
 
-gem 'sass-rails', '4.0.1'
-gem 'uglifier', '2.1.1'
-gem 'coffee-rails', '4.0.1'
-gem 'jquery-rails', '3.0.4'
-gem 'turbolinks', '1.1.1'
+gem 'sass-rails', '5.0.5'
+gem 'uglifier', '2.7.2'
+gem 'coffee-rails', '4.2.2'
+gem 'jquery-rails', '4.4.0'
+gem 'turbolinks', '5.0.0'
 gem 'jbuilder', '1.0.2'
 
 group :doc do
-  gem 'sdoc', '0.3.20', require: false
+  gem 'sdoc', '0.4.0', require: false
 end
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