diff --git a/spec/dummy/Gemfile b/spec/dummy/Gemfile
index 089774a..62f1a8e 100644
--- a/spec/dummy/Gemfile
+++ b/spec/dummy/Gemfile
@@ -1,9 +1,9 @@
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 4.0.0'
-gem 'activeresource', '~> 4.0.0'
-gem 'actionmailer', '~> 4.0.0'
-gem 'railties', '~> 4.0.0'
+gem 'activerecord', '~> 6.1.7', '>= 6.1.7.3'
+gem 'activeresource', '~> 5.1.0'
+gem 'actionmailer', '~> 6.1.7', '>= 6.1.7.3'
+gem 'railties', '~> 6.1.7', '>= 6.1.7.3'
 
 gem 'sqlite3'
 
@@ -13,7 +13,7 @@ gem 'kaminari'
 gem 'plupload-rails'
 
 gem 'haml-rails'
-gem 'jquery-rails'
-gem 'sass-rails'
+gem 'jquery-rails', '>= 4.0.1'
+gem 'sass-rails', '>= 5.0.8'
 gem 'bootstrap_sass_rails'
-gem 'simple_form'
+gem 'simple_form', '>= 4.0.0'