diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d623609eef0f57597d6c4362a4cd9b45bbb6608..fb49ef573c65f4b7a16f782e982b8a5a1302e638 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@
 - Feat: プラグイン・テーマを外部サイトから直接インストールできるようになりました
 	- 外部サイトでの実装が必要です。詳細は Misskey Hub をご覧ください
 	  https://misskey-hub.net/docs/advanced/publish-on-your-website.html
+- Fix: 投稿フォームでのユーザー変更がプレビューに反映されない問題を修正
 
 ### Server
 - Fix: リストTLに自分のフォロワー限定投稿が含まれない問題を修正
diff --git a/packages/frontend/src/components/MkNotePreview.vue b/packages/frontend/src/components/MkNotePreview.vue
index fc6ea89085b24733043451a59c2f2d06f1cb3e15..923c240cf08721b34574651feccfee3125bf69e8 100644
--- a/packages/frontend/src/components/MkNotePreview.vue
+++ b/packages/frontend/src/components/MkNotePreview.vue
@@ -5,14 +5,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div :class="$style.root">
-	<MkAvatar :class="$style.avatar" :user="$i" link preview/>
+	<MkAvatar :class="$style.avatar" :user="user" link preview/>
 	<div :class="$style.main">
 		<div :class="$style.header">
-			<MkUserName :user="$i" :nowrap="true"/>
+			<MkUserName :user="user" :nowrap="true"/>
 		</div>
 		<div>
 			<div>
-				<Mfm :text="text.trim()" :author="$i" :i="$i"/>
+				<Mfm :text="text.trim()" :author="user" :i="user"/>
 			</div>
 		</div>
 	</div>
@@ -21,10 +21,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { } from 'vue';
-import { $i } from '@/account.js';
+import * as Misskey from 'misskey-js';
 
 const props = defineProps<{
 	text: string;
+	user: Misskey.entities.User;
 }>();
 </script>
 
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index f6981cea72f146157b7d1a7381933ca975f807c7..598846b16699ad4d96bc9a535228147592677de8 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -73,7 +73,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<input v-show="withHashtags" ref="hashtagsInputEl" v-model="hashtags" :class="$style.hashtags" :placeholder="i18n.ts.hashtags" list="hashtags">
 	<XPostFormAttaches v-model="files" @detach="detachFile" @changeSensitive="updateFileSensitive" @changeName="updateFileName" @replaceFile="replaceFile"/>
 	<MkPollEditor v-if="poll" v-model="poll" @destroyed="poll = null"/>
-	<MkNotePreview v-if="showPreview" :class="$style.preview" :text="text"/>
+	<MkNotePreview v-if="showPreview" :class="$style.preview" :text="text" :user="postAccount ?? $i"/>
 	<div v-if="showingOptions" style="padding: 8px 16px;">
 	</div>
 	<footer :class="$style.footer">