diff --git a/packages/sw/build.js b/packages/sw/build.js
index a9c2e428c0..c975408664 100644
--- a/packages/sw/build.js
+++ b/packages/sw/build.js
@@ -9,6 +9,7 @@ import { fileURLToPath } from 'node:url';
 import * as esbuild from 'esbuild';
 import locales from '../../locales/index.js';
 import meta from '../../package.json' with { type: 'json' };
+import { localesVersion } from '../../locales/version.js';
 const watch = process.argv[2]?.includes('watch');
 
 const __dirname = fileURLToPath(new URL('.', import.meta.url));
@@ -23,6 +24,7 @@ const buildOptions = {
 		_DEV_: JSON.stringify(process.env.NODE_ENV !== 'production'),
 		_ENV_: JSON.stringify(process.env.NODE_ENV ?? ''), // `NODE_ENV`が`undefined`なとき`JSON.stringify`が`undefined`を返してエラーになってしまうので`??`を使っている
 		_LANGS_: JSON.stringify(Object.entries(locales).map(([k, v]) => [k, v._lang_])),
+		_LANGS_VERSION_: JSON.stringify(localesVersion),
 		_PERF_PREFIX_: JSON.stringify('Misskey:'),
 		_VERSION_: JSON.stringify(meta.version),
 	},
diff --git a/packages/sw/eslint.config.js b/packages/sw/eslint.config.js
index c62a2eadc6..7878eb14b0 100644
--- a/packages/sw/eslint.config.js
+++ b/packages/sw/eslint.config.js
@@ -12,6 +12,7 @@ export default [
 				require: false,
 				_DEV_: false,
 				_LANGS_: false,
+				_LANGS_VERSION_: false,
 				_VERSION_: false,
 				_ENV_: false,
 				_PERF_PREFIX_: false,
diff --git a/packages/sw/src/@types/global.d.ts b/packages/sw/src/@types/global.d.ts
index bf63810e6d..334fa81511 100644
--- a/packages/sw/src/@types/global.d.ts
+++ b/packages/sw/src/@types/global.d.ts
@@ -7,6 +7,7 @@
 type FIXME = any;
 
 declare const _LANGS_: string[][];
+declare const _LANGS_VERSION_: string;
 declare const _VERSION_: string;
 declare const _ENV_: string;
 declare const _DEV_: boolean;
diff --git a/packages/sw/src/scripts/lang.ts b/packages/sw/src/scripts/lang.ts
index 3000160e41..41b06515f4 100644
--- a/packages/sw/src/scripts/lang.ts
+++ b/packages/sw/src/scripts/lang.ts
@@ -11,7 +11,7 @@ import { I18n } from '@@/js/i18n.js';
 import type { Locale } from '../../../../locales/index.js';
 
 class SwLang {
-	public cacheName = `mk-cache-${_VERSION_}`;
+	public cacheName = `mk-cache-${_LANGS_VERSION_}`;
 
 	public lang: Promise<string> = get('lang').then(async prelang => {
 		if (!prelang) return 'en-US';
@@ -32,7 +32,7 @@ class SwLang {
 
 	private async _fetch(): Promise<I18n<Locale>> {
 		// Service Workerは何度も起動しそのたびにlocaleを読み込むので、CacheStorageを使う
-		const localeUrl = `/assets/locales/${await this.lang}.${_VERSION_}.json`;
+		const localeUrl = `/assets/locales/${await this.lang}.${_LANGS_VERSION_}.json`;
 		let localeRes = await caches.match(localeUrl);
 
 		// _DEV_がtrueの場合は常に最新化