diff --git a/lib/tasks/timeline_events.rake b/lib/tasks/timeline_events.rake
index 13bceac257..58a57497c2 100644
--- a/lib/tasks/timeline_events.rake
+++ b/lib/tasks/timeline_events.rake
@@ -5,4 +5,18 @@ namespace :timeline_events do
       event_type: "status_changed",
     )
   end
+
+  desc "Migrate old_state/new_state"
+  task migrate_old_new_state: :environment do
+    TimelineEvent
+      .where(event_type: %w[state_changed assessment_section_recorded])
+      .each do |timeline_event|
+        timeline_event.update!(
+          old_value: timeline_event.old_state,
+          new_value: timeline_event.new_state,
+          old_state: "",
+          new_state: "",
+        )
+      end
+  end
 end