diff --git a/app/models/assignment.rb b/app/models/assignment.rb
index 3e47c4e11..54abe682e 100644
--- a/app/models/assignment.rb
+++ b/app/models/assignment.rb
@@ -1,5 +1,5 @@
 class Assignment < ApplicationRecord
-  belongs_to :bubble
+  belongs_to :bubble, touch: true
 
   belongs_to :assignee, class_name: "User"
   belongs_to :assigner, class_name: "User"