diff --git a/endpoints/v1/index.py b/endpoints/v1/index.py
index 74d6b9c2d..7f276685a 100644
--- a/endpoints/v1/index.py
+++ b/endpoints/v1/index.py
@@ -237,7 +237,8 @@ def update_images(namespace_name, repo_name):
 
     updated_tags = session.get('pushed_tags', {})
     event_data = {
-      'updated_tags': updated_tags,}
+      'updated_tags': updated_tags.keys(),
+    }
 
     track_and_log('push_repo', repo)
     spawn_notification(repo, 'repo_push', event_data)
diff --git a/notifications/notificationevent.py b/notifications/notificationevent.py
index 02578e1a6..1a189da03 100644
--- a/notifications/notificationevent.py
+++ b/notifications/notificationevent.py
@@ -100,7 +100,7 @@ class RepoPushEvent(NotificationEvent):
 
   def get_sample_data(self, namespace_name, repo_name, event_config):
     return build_repository_event_data(namespace_name, repo_name, {
-      'updated_tags': {'latest': 'someimageid', 'foo': 'anotherimage'},
+      'updated_tags': ['latest', 'foo'],
       'pruned_image_count': 3
     })