diff --git a/Gemfile b/Gemfile
index 3a131a786..f1be8b9ad 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,6 +12,7 @@ gem "actionpack-xml_parser"
 gem "roadie-rails", "~> 1.2.1"
 gem "roadie", "~> 3.2.1"
 gem "mimemagic"
+gem "mail", "~> 2.6.6"
 
 gem "nokogiri", "~> 1.8.0"
 gem "i18n", "~> 0.7.0"