diff --git a/Gemfile b/Gemfile
index f00a2d2..c5735c2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 gemspec
 
 # mime-types 3+, required by mail, requires ruby 2.0+
-gem "mime-types", "< 3" if Bundler.ruby_version.gem_version < Gem::Version.new("2")
+gem "mime-types", "< 3" if Gem::Version.new(RUBY_VERSION) < Gem::Version.new("2")
 
 #group :development do
 #  gem "pry"