diff --git a/Gemfile b/Gemfile
index 26be2f4..bf2bda2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 RAILS_VERSION = '~> 4.1.8'
 
-ruby ENV['GEMFILE_RUBY_VERSION'] if ENV['GEMFILE_RUBY_VERSION']
+send :ruby, ENV['GEMFILE_RUBY_VERSION'] if ENV['GEMFILE_RUBY_VERSION']
 
 gem 'actionmailer', RAILS_VERSION
 gem 'actionpack', RAILS_VERSION
--
libgit2 0.21.2