diff --git a/Gemfile b/Gemfile
index 161e227..f00a2d2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,8 +2,8 @@ source "https://rubygems.org"
 
 gemspec
 
-gem 'mime-types', '~> 2.99' if RUBY_VERSION < '2.0'
-# gem "eventmachine", path: "#{ENV["HOME"]}/Projects/eventmachine"
+# mime-types 3+, required by mail, requires ruby 2.0+
+gem "mime-types", "< 3" if Bundler.ruby_version.gem_version < Gem::Version.new("2")
 
 #group :development do
 #  gem "pry"