diff --git a/tools/attachment/attachment.openapi.yaml b/tools/attachment/attachment.openapi.yaml
index 1c35e42..fbb160e 100644
--- a/tools/attachment/attachment.openapi.yaml
+++ b/tools/attachment/attachment.openapi.yaml
@@ -523,7 +523,6 @@ components:
       required: true
       schema:
         type: string
-        format: uuid
     If-Match:
       name: If-Match
       in: header