Gemfile in vagrant-librarian-puppet-0.9.0 vs Gemfile in vagrant-librarian-puppet-0.9.1

@@ -1,10 +1,10 @@
 source "https://rubygems.org"
 
 gemspec
 
 group :development do
-  gem "vagrant", github: "mitchellh/vagrant"
+  gem "vagrant", github: "mitchellh/vagrant", ref: "v1.7.4"
   gem "byebug"
 end
 
 group :plugins do
   gem "vagrant-librarian-puppet", path: "."