diff --git a/Gemfile b/Gemfile
index 8c7a257b..00f7d760 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,7 @@ group :development, :test, :system_tests do
   else
     gem 'puppet-openstack_spec_helper',
         :git => 'https://opendev.org/openstack/puppet-openstack_spec_helper',
+        :ref => 'stable/ussuri',
         :require => 'false'
   end
 end