diff --git a/Gemfile b/Gemfile
index 28d13cd..efeb546 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,6 +9,8 @@ end
 
 gem "bigdecimal", "~> 1.4" if RUBY_VERSION >= "2.5" && RAILS_VERSION = "4.2"
 
+gem "loofah", "2.20.0" if RUBY_VERSION < "2.5"
+
 gem "test-unit", "~> 3.0" if RUBY_VERSION >= "2.2" && RAILS_VERSION == "3.2"
 
 gem 'sprockets', '~>3.0'