diff --git a/demo/29_uuid.yaml b/demo/29_uuid.yaml
index 00e0291d..bcda8d18 100644
--- a/demo/29_uuid.yaml
+++ b/demo/29_uuid.yaml
@@ -1,9 +1,3 @@
-from: uuid.v1.yaml
 fields:
-  - field: length32_random_no_separator
-    use: length32_random_no_separator
-    postfix: " "
-
-  - field: length16
-    use: length16
-    postfix: " "
+  - field: field_uuid
+    format: "uuid(-)"