diff --git a/spec/default_spec.rb b/spec/default_spec.rb
index d700edf..133b44c 100644
--- a/spec/default_spec.rb
+++ b/spec/default_spec.rb
@@ -21,7 +21,7 @@ describe 'postfix::default' do
 
   context 'on SmartOS' do
     let(:chef_run) do
-      ChefSpec::ServerRunner.new(platform: 'smartos', version: 'joyent_20130111T180733Z').converge(described_recipe)
+      ChefSpec::ServerRunner.new(platform: 'smartos', version: '5.11').converge(described_recipe)
     end
 
     it '[COOK-4423] renders file main.cf without smtp_use_tls' do