diff --git a/lib/omni_kassa.rb b/lib/omni_kassa.rb
index <HASH>..<HASH> 100644
--- a/lib/omni_kassa.rb
+++ b/lib/omni_kassa.rb
@@ -3,7 +3,7 @@ require 'active_support/core_ext/string'
 
 module OmniKassa
   REQUEST_SETTINGS = :merchant_id, :currency_code, :transaction_reference,
-    :customer_language
+    :customer_language, :key_version
   SETTINGS = REQUEST_SETTINGS + [:secret_key, :url]
 
   def self.config(settings)
Added key_version to REQUEST_SETTINGS