diff --git a/packages/backend/src/core/GlobalEventService.ts b/packages/backend/src/core/GlobalEventService.ts
index 87aa70713e..8cda6d8dac 100644
--- a/packages/backend/src/core/GlobalEventService.ts
+++ b/packages/backend/src/core/GlobalEventService.ts
@@ -120,6 +120,7 @@ export interface NoteEventTypes {
 	updated: {
 		cw: string | null;
 		text: string;
+		updatedAt: string;
 	};
 	reacted: {
 		reaction: string;
diff --git a/packages/backend/src/core/NoteUpdateService.ts b/packages/backend/src/core/NoteUpdateService.ts
index 12e5434436..40d5f1746b 100644
--- a/packages/backend/src/core/NoteUpdateService.ts
+++ b/packages/backend/src/core/NoteUpdateService.ts
@@ -86,6 +86,7 @@ export class NoteUpdateService {
 			this.globalEventService.publishNoteStream(note.id, 'updated', {
 				cw: ps.cw,
 				text: ps.text ?? '', // prevent null
+				updatedAt: ps.updatedAt.toISOString(),
 			});
 
 			if (this.userEntityService.isLocalUser(user) && !note.localOnly) {
diff --git a/packages/frontend/src/scripts/use-note-capture.ts b/packages/frontend/src/scripts/use-note-capture.ts
index 86cff7887c..a35f727811 100644
--- a/packages/frontend/src/scripts/use-note-capture.ts
+++ b/packages/frontend/src/scripts/use-note-capture.ts
@@ -76,7 +76,7 @@ export function useNoteCapture(props: {
 			}
 
 			case 'updated': {
-				note.value.updatedAt = new Date().toISOString();
+				note.value.updatedAt = body.updatedAt;
 				note.value.cw = body.cw;
 				note.value.text = body.text;
 				break;
diff --git a/packages/misskey-js/src/streaming.types.ts b/packages/misskey-js/src/streaming.types.ts
index b29a84e713..50288679c4 100644
--- a/packages/misskey-js/src/streaming.types.ts
+++ b/packages/misskey-js/src/streaming.types.ts
@@ -256,6 +256,7 @@ export type NoteUpdatedEvent = {
 	body: {
 		cw: string | null;
 		text: string;
+		updatedAt: string;
 	};
 } | {
 	type: 'pollVoted';