diff --git a/config.ru b/config.ru
index d02be0c..1cd65eb 100644
--- a/config.ru
+++ b/config.ru
@@ -133,6 +133,7 @@ urls = [
   "/1.9.",
   "/2.0.",
   "/2.1.",
+  "/2.2.",
 ]
 
 case environment