diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62f37763f..d9ce5fbe6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@
 	- 今後はAPI呼び出し時およびストリーミング接続時に設定するようになります
 
 ### Client
+- リアクションの取り消し/変更時に確認ダイアログを出すように
 - 開発者モードを追加
 - AiScriptを0.13.3に更新
 - Fix: URLプレビューで情報が取得できなかった際の挙動を修正
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 94c00bad3..4067155a3 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1053,6 +1053,8 @@ update: "更新"
 rolesThatCanBeUsedThisEmojiAsReaction: "リアクションとして使えるロール"
 rolesThatCanBeUsedThisEmojiAsReactionEmptyDescription: "ロールの指定が一つもない場合、誰でもリアクションとして使えます。"
 rolesThatCanBeUsedThisEmojiAsReactionPublicRoleWarn: "ロールは公開ロールである必要があります。"
+cancelReactionConfirm: "リアクションを取り消しますか？"
+changeReactionConfirm: "リアクションを変更しますか？"
 
 _initialAccountSetting:
   accountCreated: "アカウントの作成が完了しました！"
diff --git a/packages/frontend/src/components/MkReactionsViewer.reaction.vue b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
index 9480af510..b521171b2 100644
--- a/packages/frontend/src/components/MkReactionsViewer.reaction.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.reaction.vue
@@ -6,7 +6,7 @@
 	:class="[$style.root, { [$style.reacted]: note.myReaction == reaction, [$style.canToggle]: canToggle, [$style.large]: defaultStore.state.largeNoteReactions }]"
 	@click="toggleReaction()"
 >
-	<MkReactionIcon :class="$style.icon" :reaction="reaction" :emoji-url="note.reactionEmojis[reaction.substr(1, reaction.length - 2)]"/>
+	<MkReactionIcon :class="$style.icon" :reaction="reaction" :emojiUrl="note.reactionEmojis[reaction.substr(1, reaction.length - 2)]"/>
 	<span :class="$style.count">{{ count }}</span>
 </button>
 </template>
@@ -22,6 +22,7 @@ import { $i } from '@/account';
 import MkReactionEffect from '@/components/MkReactionEffect.vue';
 import { claimAchievement } from '@/scripts/achievements';
 import { defaultStore } from '@/store';
+import { i18n } from '@/i18n';
 
 const props = defineProps<{
 	reaction: string;
@@ -34,11 +35,17 @@ const buttonEl = shallowRef<HTMLElement>();
 
 const canToggle = computed(() => !props.reaction.match(/@\w/) && $i);
 
-const toggleReaction = () => {
+async function toggleReaction() {
 	if (!canToggle.value) return;
 
 	const oldReaction = props.note.myReaction;
 	if (oldReaction) {
+		const confirm = await os.confirm({
+			type: 'warning',
+			text: oldReaction !== props.reaction ? i18n.ts.changeReactionConfirm : i18n.ts.cancelReactionConfirm,
+		});
+		if (confirm.canceled) return;
+
 		os.api('notes/reactions/delete', {
 			noteId: props.note.id,
 		}).then(() => {
@@ -58,9 +65,9 @@ const toggleReaction = () => {
 			claimAchievement('reactWithoutRead');
 		}
 	}
-};
+}
 
-const anime = () => {
+function anime() {
 	if (document.hidden) return;
 	if (!defaultStore.state.animation) return;
 
@@ -68,7 +75,7 @@ const anime = () => {
 	const x = rect.left + 16;
 	const y = rect.top + (buttonEl.value.offsetHeight / 2);
 	os.popup(MkReactionEffect, { reaction: props.reaction, x, y }, {}, 'end');
-};
+}
 
 watch(() => props.count, (newCount, oldCount) => {
 	if (oldCount < newCount) anime();