diff --git a/CALCKEY.md b/CALCKEY.md
index d2ab613728..e567951692 100644
--- a/CALCKEY.md
+++ b/CALCKEY.md
@@ -75,6 +75,7 @@
 - Make showing the update popup optional
 - Improve PWA manifest
 - Fix incoming chat scrolling globally
+- Update notifier
 - Obliteration of Ai-chan
 - [Make showing ads optional](https://github.com/misskey-dev/misskey/pull/8996)
 - [Tapping avatar in mobile opens account modal](https://github.com/misskey-dev/misskey/pull/9056)
diff --git a/locales/en-US.yml b/locales/en-US.yml
index bfde20c5cb..e5ea4c0a0b 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -913,6 +913,7 @@ recommendedInstances: "Recommended instances"
 recommendedInstancesDescription: "Recommended instances seperated by line breaks to appear in the recommended timeline. Do NOT add `https://`, ONLY the domain."
 caption: "Auto Caption"
 splash: "Splash Screen"
+updateAvailable: "There's an update available!"
 
 _sensitiveMediaDetection:
   description: "Reduces the effort of server moderation through automatically recognizing NSFW media via Machine Learning. This will slightly increase the load on the server."
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index c0b244cbc0..5636421842 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -913,6 +913,7 @@ recommendedInstances: "推奨インスタンス"
 recommendedInstancesDescription: "推奨タイムラインに表示するために改行で区切られた推奨インスタンス。`https：//`を追加しないでください。ドメインのみを追加してください。"
 caption: "自動キャプション"
 splash: "スプラッシュスクリーン"
+updateAvailable: "アップデートがありますよ"
 
 _sensitiveMediaDetection:
   description: "機械学習を使って自動でセンシティブなメディアを検出し、モデレーションに役立てることができます。サーバーの負荷が少し増えます。"
diff --git a/package.json b/package.json
index 89095852bd..3ac5f93fbd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "calckey",
-	"version": "12.119.0-calc",
+	"version": "12.119.0-calc.1",
 	"codename": "aqua",
 	"repository": {
 		"type": "git",
diff --git a/packages/client/src/pages/admin/index.vue b/packages/client/src/pages/admin/index.vue
index 9200b5d547..7e95ab368a 100644
--- a/packages/client/src/pages/admin/index.vue
+++ b/packages/client/src/pages/admin/index.vue
@@ -1,6 +1,6 @@
 <template>
 <div ref="el" class="hiyeyicy" :class="{ wide: !narrow }">
-	<div v-if="!narrow || currentPage?.route.name == null" class="nav">	
+	<div v-if="!narrow || currentPage?.route.name == null" class="nav">
 		<MkSpacer :content-max="700" :margin-min="16">
 			<div class="lxpfedzu">
 				<div class="banner">
@@ -11,6 +11,7 @@
 				<MkInfo v-if="noMaintainerInformation" warn class="info">{{ i18n.ts.noMaintainerInformationWarning }} <MkA to="/admin/settings" class="_link">{{ i18n.ts.configure }}</MkA></MkInfo>
 				<MkInfo v-if="noBotProtection" warn class="info">{{ i18n.ts.noBotProtectionWarning }} <MkA to="/admin/security" class="_link">{{ i18n.ts.configure }}</MkA></MkInfo>
 				<MkInfo v-if="noEmailServer" warn class="info">{{ i18n.ts.noEmailServerWarning }} <MkA to="/admin/email-settings" class="_link">{{ i18n.ts.configure }}</MkA></MkInfo>
+				<MkInfo v-if="updateAvailable" warn class="info">{{ i18n.ts.updateAvailable }} <MkA to="https://codeberg.org/thatonecalculator/calckey" class="_link">{{ i18n.ts.check }}</MkA></MkInfo>
 
 				<MkSuperMenu :def="menuDef" :grid="currentPage?.route.name == null"></MkSuperMenu>
 			</div>
@@ -29,6 +30,7 @@ import MkSuperMenu from '@/components/MkSuperMenu.vue';
 import MkInfo from '@/components/MkInfo.vue';
 import { scroll } from '@/scripts/scroll';
 import { instance } from '@/instance';
+import { version } from '@/config';
 import * as os from '@/os';
 import { lookupUser } from '@/scripts/lookup-user';
 import { useRouter } from '@/router';
@@ -56,6 +58,7 @@ let noMaintainerInformation = isEmpty(instance.maintainerName) || isEmpty(instan
 let noBotProtection = !instance.disableRegistration && !instance.enableHcaptcha && !instance.enableRecaptcha;
 let noEmailServer = !instance.enableEmail;
 let thereIsUnresolvedAbuseReport = $ref(false);
+let updateAvailable = $ref(false);
 let currentPage = $computed(() => router.currentRef.value.child);
 
 os.api('admin/abuse-user-reports', {
@@ -65,6 +68,14 @@ os.api('admin/abuse-user-reports', {
 	if (reports.length > 0) thereIsUnresolvedAbuseReport = true;
 });
 
+fetch('https://codeberg.org/api/v1/repos/thatonecalculator/calckey/releases?draft=false&pre-release=false&page=1&limit=1')
+	.then((response) => response.json())
+	.then((data) => {
+		if (data.length > 0 && data[0].tag_name !== version) {
+			updateAvailable = true;
+		}
+	});
+
 const NARROW_THRESHOLD = 600;
 const ro = new ResizeObserver((entries, observer) => {
 	if (entries.length === 0) return;