diff --git a/Gemfile b/Gemfile
index 998e45e..9b75d9c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,12 +1,12 @@
 source 'https://rubygems.org'
 ruby '2.1.2'
 
-gem 'rails', '4.2.5'
-gem 'sass-rails', '~> 4.0.3'
+gem 'rails', '7.0.0'
+gem 'sass-rails', '~> 6.0.0'
 gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.0.0'
 gem 'jquery-rails'
-gem 'turbolinks'
+gem 'turbolinks', '>= 5.0.0'
 gem 'jbuilder', '~> 2.0'
 gem 'sdoc', '~> 0.4.0',          group: :doc
 gem 'spring',        group: :development
@@ -14,7 +14,7 @@ gem 'bootstrap-sass'
 gem 'devise'
 gem 'pundit'
 gem 'simple_form'
-gem 'slim-rails'
+gem 'slim-rails', '>= 3.1.0'
 
 gem 'bootstrap3_autocomplete_input'
 gem 'twitter-typeahead-rails'
@@ -92,7 +92,7 @@ group :test do
   gem 'database_cleaner'
   gem 'launchy'
   gem 'selenium-webdriver'
-  gem 'cucumber-rails', :require=>false
+  gem 'cucumber-rails', '>= 3.0.0', :require=>false
   gem 'shoulda-matchers'
 
   # for Travis CI