diff --git a/Gemfile b/Gemfile
index 8aa0105..69698de 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+source :rubygems
+
 puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 2.7']
 
 gem 'rake'