diff --git a/db/migrate/20160509025404_update_activity.rb b/db/migrate/20160509025404_update_activity.rb
new file mode 100644
index 000000000..2a959f5a2
--- /dev/null
+++ b/db/migrate/20160509025404_update_activity.rb
@@ -0,0 +1,24 @@
+class UpdateActivity < ActiveRecord::Migration
+  def up
+    homeworks = HomeworkCommon.where("course_id = 342")
+    unless homeworks.nil?
+      homeworks.each do |h|
+        course_activity = CourseActivity.where("course_act_type=? and course_act_id =?", 'HomeworkCommon', h.id).first
+        user_activity = UserActivity.where("act_type=? and act_id =?", 'HomeworkCommon', h.id).first
+        org_activity = OrgActivity.where("org_act_type=? and org_act_id =?", 'HomeworkCommon', h.id).first
+        if course_activity && h.updated_at > course_activity.updated_at
+          course_activity.update_column('updated_at', h.updated_at)
+        end
+        if user_activity && h.updated_at > user_activity.updated_at
+          user_activity.update_column('updated_at', h.updated_at)
+        end
+        if org_activity && h.updated_at > org_activity.updated_at
+          org_activity.update_column('updated_at', h.updated_at)
+        end
+      end
+    end
+  end
+
+  def down
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 3ffa35872..c96524c5e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160506104128) do
+ActiveRecord::Schema.define(:version => 20160509025404) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false