diff --git a/metadata.rb b/metadata.rb
index 8387ea0..2295ffe 100644
--- a/metadata.rb
+++ b/metadata.rb
@@ -11,4 +11,4 @@ end
 
 source_url 'https://github.com/chef-cookbooks/postfix'
 issues_url 'https://github.com/chef-cookbooks/postfix/issues'
-chef_version '>= 12.1' if respond_to?(:chef_version)
+chef_version '>= 12.15'