diff --git a/Gemfile b/Gemfile
index 97ffa4d94b..4ce1489534 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,6 @@ gem 'angular-rails-templates', '>= 0.3.0'
 gem 'awesome_nested_set'
 gem 'ransack', '2.4.2'
 gem 'responders'
-gem 'sass', '~> 3.4.0' # this restriction originates from foundation-rails's version
 gem 'sass-rails', '< 5.1.0' # this restriction originates from the compass-rails's version
 
 gem 'i18n'
diff --git a/Gemfile.lock b/Gemfile.lock
index 540f957ce0..5974b802ac 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -769,7 +769,6 @@ DEPENDENCIES
   rswag
   rubocop
   rubocop-rails
-  sass (~> 3.4.0)
   sass-rails (< 5.1.0)
   select2-rails!
   selenium-webdriver