diff --git a/models/staging/core/schema.yml b/models/staging/core/schema.yml
index 6ed040f..cc19815 100644
--- a/models/staging/core/schema.yml
+++ b/models/staging/core/schema.yml
@@ -264,10 +264,14 @@ models:
       - name: created_at_utc
         data_type: timestamp without time zone
         description: "Timestamp of when user was created"
+        tests:
+          - not_null
 
       - name: updated_at_utc
         data_type: timestamp without time zone
         description: "Timestamp of when user was last updated"
+        tests:
+          - not_null
 
       - name: dwh_extracted_at_utc
         data_type: timestamp with time zone