diff --git a/README.md b/README.md
index 78fdf79..ab81c30 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Requirements
 May work on other platforms with or without modification.
 
 #### Chef
-- Chef 11+
+- Chef 12+
 
 #### Cookbooks
 - none
@@ -303,7 +303,7 @@ License & Authors
 
 **Author:** Cookbook Engineering Team (<cookbooks@chef.io>)
 
-**Copyright:** 2009-2015, Chef Software, Inc.
+**Copyright:** 2009-2016, Chef Software, Inc.
 ```
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
diff --git a/metadata.rb b/metadata.rb
index c540cab..3160cdf 100644
--- a/metadata.rb
+++ b/metadata.rb
@@ -19,5 +19,7 @@ recipe 'postfix::server', 'Sets the mail_type attribute to master'
   supports os
 end
 
-source_url 'https://github.com/chef-cookbooks/postfix' if respond_to?(:issues_url)
-issues_url 'https://github.com/chef-cookbooks/postfix/issues' if respond_to?(:source_url)
+source_url 'https://github.com/chef-cookbooks/postfix'
+issues_url 'https://github.com/chef-cookbooks/postfix/issues'
+
+chef_version '>= 12.1'