diff --git a/buds/07.md b/buds/07.md
index 5c88aab..f996045 100644
--- a/buds/07.md
+++ b/buds/07.md
@@ -39,7 +39,7 @@ X-{payment_method}: "<encoded_payload_according_to_{payment_method}_spec>"
 
 ### `X-Cashu` Header
 
-When using the X-Cashu header, the server MUST adhere to the [NUT-18](https://github.com/cashubtc/nuts/blob/main/18.md) standard.
+When using the X-Cashu header, the server MUST adhere to the [NUT-23](https://github.com/cashubtc/nuts/pull/239) standard.
 
 Example for cashu: