diff --git a/backend/solidus_backend.gemspec b/backend/solidus_backend.gemspec
index 4dcf37bdbe9..9f9038dcd9d 100644
--- a/backend/solidus_backend.gemspec
+++ b/backend/solidus_backend.gemspec
@@ -30,6 +30,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'jquery-rails'
   s.add_dependency 'kaminari', '~> 1.1'
   s.add_dependency 'sass-rails'
+  s.add_dependency 'sass', '>= 3.5.2'
 
   s.add_dependency 'autoprefixer-rails', '~> 7.1'
   s.add_dependency 'handlebars_assets', '~> 0.23'