diff --git a/src/pages/index.astro b/src/pages/index.astro
index 40b8813..faace4b 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -6,7 +6,6 @@ import Craftattack from '@assets/img/craftattack.webp';
 import Background from '@assets/img/background.webp';
 import { HOMEPAGE_TRAILER_URL, START_DATE } from 'astro:env/server';
 import { getSetting, SettingKey } from '@util/settings';
-import { siteUrl } from '@util/url.ts';
 import { db } from '@db/database.ts';
 
 const signupEnabled = await getSetting(db, SettingKey.SignupEnabled, false);
diff --git a/src/pages/video/[name].astro b/src/pages/video/[name].astro
index fa12b58..5838bd5 100644
--- a/src/pages/video/[name].astro
+++ b/src/pages/video/[name].astro
@@ -14,7 +14,9 @@ if (!metadata) return new Response(null, { status: 404 });
 
 const { title, description, longDescription } = metadata;
 const streamUrl = siteUrl(`video/${encodeURIComponent(video.name)}/stream`);
-const thumbnailUrl = siteUrl(`video/${encodeURIComponent(video.name)}/thumbnail.jpg`);
+const thumbnailUrl = siteUrl(
+  `video/${encodeURIComponent(video.name)}/thumbnail.jpg?v=${video.modifiedAt.getTime()}-${video.size}`
+);
 ---
 
 <WebsiteLayout title={title} description={description ?? undefined} openGraph="minimal">
diff --git a/src/pages/video/[name]/embed.astro b/src/pages/video/[name]/embed.astro
index eecf5f9..0ff898d 100644
--- a/src/pages/video/[name]/embed.astro
+++ b/src/pages/video/[name]/embed.astro
@@ -13,7 +13,9 @@ if (!video) return new Response(null, { status: 404 });
 const metadata = await getVideoMetadata(video);
 const title = metadata?.title ?? video.name;
 const streamUrl = siteUrl(`video/${encodeURIComponent(video.name)}/stream`);
-const thumbnailUrl = siteUrl(`video/${encodeURIComponent(video.name)}/thumbnail.jpg`);
+const thumbnailUrl = siteUrl(
+  `video/${encodeURIComponent(video.name)}/thumbnail.jpg?v=${video.modifiedAt.getTime()}-${video.size}`
+);
 ---
 
 <BaseLayout title={title}>
diff --git a/src/pages/video/[name]/thumbnail.jpg.ts b/src/pages/video/[name]/thumbnail.jpg.ts
index 7acf0dd..171e39e 100644
--- a/src/pages/video/[name]/thumbnail.jpg.ts
+++ b/src/pages/video/[name]/thumbnail.jpg.ts
@@ -13,7 +13,7 @@ async function handle(context: APIContext, headersOnly = false) {
   const headers = {
     'Content-Type': thumbnail.contentType,
     'Content-Length': stats.size.toString(),
-    'Cache-Control': 'public, max-age=86400'
+    'Cache-Control': 'public, max-age=31536000, immutable'
   };
 
   if (headersOnly) return new Response(null, { headers });