diff --git a/src/client/app/desktop/views/components/ui.header.vue b/src/client/app/desktop/views/components/ui.header.vue
index 0883c9b97d..1845187ede 100644
--- a/src/client/app/desktop/views/components/ui.header.vue
+++ b/src/client/app/desktop/views/components/ui.header.vue
@@ -1,6 +1,6 @@
 <template>
 <div class="header" :style="style">
-	<p class="warn" v-if="env != 'production'">{{ $t('@.do-not-use-in-production') }}</p>
+	<p class="warn" v-if="env != 'production'">{{ $t('@.do-not-use-in-production') }} <a href="/assets/flush.html?force">Flush</a></p>
 	<div class="main" ref="main">
 		<div class="backdrop"></div>
 		<div class="main">
diff --git a/src/client/app/mobile/views/components/ui.header.vue b/src/client/app/mobile/views/components/ui.header.vue
index 33420581f6..d9994f236a 100644
--- a/src/client/app/mobile/views/components/ui.header.vue
+++ b/src/client/app/mobile/views/components/ui.header.vue
@@ -1,6 +1,6 @@
 <template>
 <div class="header" ref="root">
-	<p class="warn" v-if="env != 'production'">{{ $t('@.do-not-use-in-production') }}</p>
+	<p class="warn" v-if="env != 'production'">{{ $t('@.do-not-use-in-production') }} <a href="/assets/flush.html?force">Flush</a></p>
 	<div class="main" ref="main">
 		<div class="backdrop"></div>
 		<div class="content" ref="mainContainer">
diff --git a/src/client/assets/flush.html b/src/client/assets/flush.html
index d43600157a..27725268f9 100644
--- a/src/client/assets/flush.html
+++ b/src/client/assets/flush.html
@@ -5,7 +5,7 @@
 		<meta charset="utf-8">
 		<title>Misskeyのリカバリ</title>
 		<script>
-			const yn = window.confirm('キャッシュをクリアしますか？\n\nDo you want to clear caches?');
+			const yn = location.search === '?force' || window.confirm('キャッシュをクリアしますか？\n\nDo you want to clear caches?');
 			if (yn) {
 				localStorage.setItem('shouldFlush', 'true');
 			}