diff --git a/src/client/sw.js b/src/client/sw.js
index 0ad9e22f1..68e43429a 100644
--- a/src/client/sw.js
+++ b/src/client/sw.js
@@ -18,7 +18,7 @@ self.addEventListener('install', ev => {
 		caches.open(cacheName)
 			.then(cache => {
 				return cache.addAll([
-					'/'
+					`/?v=${version}`
 				]);
 			})
 			.then(() => self.skipWaiting())
@@ -45,7 +45,7 @@ self.addEventListener('fetch', ev => {
 				return response || fetch(ev.request);
 			})
 			.catch(() => {
-				return caches.match('/');
+				return caches.match(`/?v=${version}`);
 			})
 	);
 });
diff --git a/src/server/web/index.ts b/src/server/web/index.ts
index 7f2ecde91..fb3f05611 100644
--- a/src/server/web/index.ts
+++ b/src/server/web/index.ts
@@ -327,6 +327,10 @@ const override = (source: string, target: string, depth: number = 0) =>
 router.get('/othello', async ctx => ctx.redirect(override(ctx.URL.pathname, 'games/reversi', 1)));
 router.get('/reversi', async ctx => ctx.redirect(override(ctx.URL.pathname, 'games')));
 
+router.get('/flash', async ctx => {
+	await ctx.render('flash');
+});
+
 // Render base html for all requests
 router.get('*', async ctx => {
 	const meta = await fetchMeta();
diff --git a/src/server/web/views/flash.pug b/src/server/web/views/flash.pug
new file mode 100644
index 000000000..f279c2360
--- /dev/null
+++ b/src/server/web/views/flash.pug
@@ -0,0 +1,20 @@
+doctype html
+
+html
+	script.
+		localStorage.removeItem('locale');
+
+		try {
+			navigator.serviceWorker.controller.postMessage('clear');
+
+			navigator.serviceWorker.getRegistrations().then(registrations => {
+				return Promise.all(registrations.map(registration => registration.unregister()));
+			}).then(() => {
+				location = '/';
+			});
+		} catch (e) {
+			console.error(e);
+			setTimeout(() => {
+				location = '/';
+			}, 10000)
+		}