diff --git a/migration/1696051309107-note-updatedAt.ts b/migration/1696051309107-note-updatedAt.ts
new file mode 100644
index 0000000000..6fa1213597
--- /dev/null
+++ b/migration/1696051309107-note-updatedAt.ts
@@ -0,0 +1,16 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class noteUpdatedAt1696051309107 implements MigrationInterface {
+    name = 'noteUpdatedAt1696051309107'
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "note" ADD "updatedAt" TIMESTAMP WITH TIME ZONE`);
+        await queryRunner.query(`COMMENT ON COLUMN "note"."updatedAt" IS 'The updated date of the Note.'`);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`COMMENT ON COLUMN "note"."updatedAt" IS 'The updated date of the Note.'`);
+        await queryRunner.query(`ALTER TABLE "note" DROP COLUMN "updatedAt"`);
+    }
+
+}
diff --git a/src/client/app/common/scripts/note-subscriber.ts b/src/client/app/common/scripts/note-subscriber.ts
index ec1f71aadf..6a00314030 100644
--- a/src/client/app/common/scripts/note-subscriber.ts
+++ b/src/client/app/common/scripts/note-subscriber.ts
@@ -151,6 +151,13 @@ export default prop => ({
 					this.$_ns_target.cw = null;
 					break;
 				}
+
+				case 'updated': {
+					Vue.set(this.$_ns_target, 'updatedAt', body.updatedAt);
+					Vue.set(this.$_ns_target, 'text', body.text);
+					Vue.set(this.$_ns_target, 'cw', body.cw);
+					break;
+				}
 			}
 		},
 	}
diff --git a/src/client/app/common/views/components/note-header.vue b/src/client/app/common/views/components/note-header.vue
index a72863e1dd..f7343d7f4f 100644
--- a/src/client/app/common/views/components/note-header.vue
+++ b/src/client/app/common/views/components/note-header.vue
@@ -13,6 +13,8 @@
 		<span class="mobile" v-if="note.viaMobile"><fa icon="mobile-alt"/></span>
 		<router-link class="created-at" :to="note | notePage">
 			<mk-time :time="note.createdAt"/>
+			{{ }}
+			<span :title="$t('@.edited')" v-if="note.updatedAt != null"><fa :icon="faEdit"/></span>
 		</router-link>
 		<span class="visibility" v-if="note.visibility != 'public'">
 			<fa v-if="note.visibility == 'home'" icon="home"/>
@@ -27,6 +29,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import i18n from '../../../i18n';
+import { faEdit } from '@fortawesome/free-solid-svg-icons';
 
 export default Vue.extend({
 	i18n: i18n(),
@@ -40,7 +43,13 @@ export default Vue.extend({
 			required: false,
 			default: false
 		}
-	}
+	},
+
+	data() {
+		return {
+			faEdit,
+		}
+	},
 });
 </script>
 
diff --git a/src/client/app/common/views/deck/deck.notes.vue b/src/client/app/common/views/deck/deck.notes.vue
index 8033b20d86..06f8086b59 100644
--- a/src/client/app/common/views/deck/deck.notes.vue
+++ b/src/client/app/common/views/deck/deck.notes.vue
@@ -15,7 +15,7 @@
 		<template v-for="(note, i) in _notes">
 			<mk-note
 				:note="note"
-				:key="note.id"
+				:key="`${note.id}-${note.updatedAt}`"
 				:compact="true"
 			/>
 			<p class="date" :key="note.id + '_date'" v-if="i != notes.length - 1 && note._date != _notes[i + 1]._date">
diff --git a/src/client/app/desktop/views/components/note-detail.vue b/src/client/app/desktop/views/components/note-detail.vue
index 61d46fc943..e60d43df2e 100644
--- a/src/client/app/desktop/views/components/note-detail.vue
+++ b/src/client/app/desktop/views/components/note-detail.vue
@@ -27,6 +27,8 @@
 			<div class="info">
 				<router-link class="time" :to="appearNote | notePage">
 					<mk-time :time="appearNote.createdAt"/>
+					{{ }}
+					<fa v-if="appearNote.updatedAt != null" :icon="faEdit"/>
 				</router-link>
 				<div class="visibility-info">
 					<span class="visibility" v-if="appearNote.visibility != 'public'">
@@ -98,6 +100,7 @@ import i18n from '../../../i18n';
 import XSub from './note.sub.vue';
 import noteSubscriber from '../../../common/scripts/note-subscriber';
 import noteMixin from '../../../common/scripts/note-mixin';
+import { faEdit } from '@fortawesome/free-solid-svg-icons';
 
 export default Vue.extend({
 	i18n: i18n('desktop/views/components/note-detail.vue'),
@@ -120,6 +123,7 @@ export default Vue.extend({
 
 	data() {
 		return {
+			faEdit,
 			conversation: [],
 			conversationFetching: false,
 			replies: []
diff --git a/src/client/app/desktop/views/components/notes.vue b/src/client/app/desktop/views/components/notes.vue
index 0820d5d80c..72e89338cf 100644
--- a/src/client/app/desktop/views/components/notes.vue
+++ b/src/client/app/desktop/views/components/notes.vue
@@ -17,7 +17,7 @@
 	<!-- トランジションを有効にするとなぜかメモリリークする -->
 	<component :is="!$store.state.device.reduceMotion ? 'transition-group' : 'div'" name="mk-notes" class="notes transition" tag="div" ref="notes">
 		<template v-for="(note, i) in _notes">
-			<mk-note :note="note" :key="note.id" :compact="true" ref="note"/>
+			<mk-note :note="note" :key="`${note.id}-${note.updatedAt}`" :compact="true" ref="note"/>
 			<p class="date" :key="note.id + '_date'" v-if="i != items.length - 1 && note._date != _notes[i + 1]._date">
 				<span><fa icon="angle-up"/>{{ note._datetext }}</span>
 				<span><fa icon="angle-down"/>{{ _notes[i + 1]._datetext }}</span>
diff --git a/src/client/app/mobile/views/components/note-detail.vue b/src/client/app/mobile/views/components/note-detail.vue
index 0735637447..ed4321783a 100644
--- a/src/client/app/mobile/views/components/note-detail.vue
+++ b/src/client/app/mobile/views/components/note-detail.vue
@@ -50,6 +50,11 @@
 		<router-link class="time" :to="appearNote | notePage">
 			<mk-time :time="appearNote.createdAt" mode="detail"/>
 		</router-link>
+		<div  class="time" v-if="appearNote.updatedAt != null">
+			<fa :icon="faEdit"/>
+			{{ }}
+			<mk-time :time="appearNote.updatedAt" mode="detail"/>
+		</div>
 		<div class="visibility-info">
 			<span class="visibility" v-if="appearNote.visibility != 'public'">
 				<fa v-if="appearNote.visibility == 'home'" icon="home"/>
@@ -94,6 +99,7 @@ import i18n from '../../../i18n';
 import XSub from './note.sub.vue';
 import noteSubscriber from '../../../common/scripts/note-subscriber';
 import noteMixin from '../../../common/scripts/note-mixin';
+import { faEdit } from '@fortawesome/free-solid-svg-icons';
 
 export default Vue.extend({
 	i18n: i18n('mobile/views/components/note-detail.vue'),
@@ -116,6 +122,7 @@ export default Vue.extend({
 
 	data() {
 		return {
+			faEdit,
 			conversation: [],
 			conversationFetching: false,
 			replies: []
diff --git a/src/client/app/mobile/views/components/notes.vue b/src/client/app/mobile/views/components/notes.vue
index 1a0cd5cc24..dd22c3f564 100644
--- a/src/client/app/mobile/views/components/notes.vue
+++ b/src/client/app/mobile/views/components/notes.vue
@@ -13,7 +13,7 @@
 	<!-- トランジションを有効にするとなぜかメモリリークする -->
 	<component :is="!$store.state.device.reduceMotion ? 'transition-group' : 'div'" name="mk-notes" class="transition" tag="div">
 		<template v-for="(note, i) in _notes">
-			<mk-note :note="note" :key="note.id"/>
+			<mk-note :note="note" :key="`${note.id}-${note.updatedAt}`"/>
 			<p class="date" :key="note.id + '_date'" v-if="i != items.length - 1 && note._date != _notes[i + 1]._date">
 				<span><fa icon="angle-up"/>{{ note._datetext }}</span>
 				<span><fa icon="angle-down"/>{{ _notes[i + 1]._datetext }}</span>
diff --git a/src/models/entities/note.ts b/src/models/entities/note.ts
index 891c45ebb9..7766e3b713 100644
--- a/src/models/entities/note.ts
+++ b/src/models/entities/note.ts
@@ -18,6 +18,12 @@ export class Note {
 	})
 	public createdAt: Date;
 
+	@Column('timestamp with time zone', {
+		nullable: true,
+		comment: 'The updated date of the Note.'
+	})
+	public updatedAt: Date | null;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/src/models/repositories/note.ts b/src/models/repositories/note.ts
index e1af8b562a..4b1e4ef36b 100644
--- a/src/models/repositories/note.ts
+++ b/src/models/repositories/note.ts
@@ -155,6 +155,7 @@ export class NoteRepository extends Repository<Note> {
 		const packed = await awaitAll({
 			id: note.id,
 			createdAt: note.createdAt.toISOString(),
+			updatedAt: note.updatedAt?.toISOString(),
 			app: note.appId ? Apps.pack(note.appId) : undefined,
 			userId: note.userId,
 			user: Users.pack(note.user || note.userId, meId),
diff --git a/src/remote/activitypub/kernel/update/index.ts b/src/remote/activitypub/kernel/update/index.ts
index f34e1d548c..de1d39821e 100644
--- a/src/remote/activitypub/kernel/update/index.ts
+++ b/src/remote/activitypub/kernel/update/index.ts
@@ -1,9 +1,10 @@
 import { IRemoteUser } from '../../../../models/entities/user';
-import { getApType, IUpdate, isActor } from '../../type';
+import { getApType, IUpdate, isActor, isPost } from '../../type';
 import { apLogger } from '../../logger';
 import { updateQuestion } from '../../models/question';
 import Resolver from '../../resolver';
 import { updatePerson } from '../../models/person';
+import updateNote from './note';
 
 /**
  * Updateアクティビティを捌きます
@@ -28,6 +29,8 @@ export default async (actor: IRemoteUser, activity: IUpdate): Promise<string> =>
 	} else if (getApType(object) === 'Question') {
 		await updateQuestion(object, resolver).catch(e => console.log(e));
 		return `ok: Question updated`;
+	} else if (isPost(object)) {
+		return await updateNote(actor, object);
 	} else {
 		return `skip: Unknown type: ${getApType(object)}`;
 	}
diff --git a/src/remote/activitypub/kernel/update/note.ts b/src/remote/activitypub/kernel/update/note.ts
new file mode 100644
index 0000000000..f68b4bd39c
--- /dev/null
+++ b/src/remote/activitypub/kernel/update/note.ts
@@ -0,0 +1,67 @@
+import { getApLock } from "../../../../misc/app-lock";
+import { extractDbHost } from "../../../../misc/convert-host";
+import { Notes } from "../../../../models";
+import { IRemoteUser } from "../../../../models/entities/user";
+import { publishNoteStream } from "../../../../services/stream";
+import DbResolver from "../../db-resolver";
+import { apLogger } from "../../logger";
+import { htmlToMfm } from "../../misc/html-to-mfm";
+import { IPost, getApId } from "../../type";
+
+const logger = apLogger;
+
+export default async function(actor: IRemoteUser, note: IPost): Promise<string> {
+	if (typeof note.id !== 'string') return 'skip';
+
+	// Note.attributedToは署名と同じである必要がある
+	if (actor.uri !== note.attributedTo) {
+		return `skip: actor.uri !== note.attributedTo`;
+	}
+	
+
+	// Note.idのホストは署名と同一である必要がある
+	if (extractDbHost(note.id) !== extractDbHost(actor.uri)) {
+		return `skip: host in actor.uri !== host in note.id`;
+	}
+	
+	const uri = getApId(note);
+
+	logger.info(`Update the Note: ${uri}`);
+
+	const unlock = await getApLock(uri);
+
+	try {
+		const dbResolver = new DbResolver();
+
+		// 元ノート照合
+		const origin = await dbResolver.getNoteFromApId(uri);
+		if (!origin) return 'skip: old note is not found';
+
+		// 同じユーザーである必要がある
+		if (!(origin.userId === actor.id)) {
+			return '投稿をUpdateしようとしているユーザーは投稿の作成者ではありません';
+		}
+
+		// validateはinboxのハードリミットでいい
+
+		// テキストのパース
+		const text = note._misskey_content || (note.content ? htmlToMfm(note.content, note.tag) : null);
+		const cw = note.summary === '' ? null : note.summary;
+
+		// Update
+		const updates = {
+			updatedAt: new Date(),
+			text: text?.trim(),
+			cw: cw ?? null,
+		};
+
+		await Notes.update({ id: origin.id }, updates);
+
+		// Publish to streaming
+		publishNoteStream(origin.id, 'updated', updates);
+ 
+		return 'ok';
+	} finally {
+		unlock();
+	}
+}