Gemfile in blacklight-5.14.0 vs Gemfile in blacklight-5.15.0

@@ -18,12 +18,13 @@
   puts "Loading #{file} ..." if $DEBUG # `ruby -d` or `bundle -v`
   instance_eval File.read(file)
 else
   gem 'rails', ENV['RAILS_VERSION'] if ENV['RAILS_VERSION']
 
-  if ENV['RAILS_VERSION'] and ENV['RAILS_VERSION'] =~ /^4.2/
+  if ENV['RAILS_VERSION'].nil? || ENV['RAILS_VERSION'] > "4.2"
     gem 'responders', "~> 2.0"
     gem 'sass-rails', ">= 5.0"
   else
+    gem 'bootstrap-sass', '< 3.3.5' # 3.3.5 requires sass 3.3, incompatible with sass-rails 4.x
     gem 'sass-rails', "< 5.0"
   end
 end