diff --git a/apps/web/package.json b/apps/web/package.json
index 5eb48de..2567f7d 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@typetype/web",
   "private": true,
-  "version": "1.5.0",
+  "version": "1.5.1",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/apps/web/src/components/subtitle-track-utils.ts b/apps/web/src/components/subtitle-track-utils.ts
index a62c0c2..b1875ec 100644
--- a/apps/web/src/components/subtitle-track-utils.ts
+++ b/apps/web/src/components/subtitle-track-utils.ts
@@ -46,7 +46,7 @@ export function buildSafeSubtitleTracks(
 
     let src = "";
     try {
-      src = toSubtitleVttUrl(rawUrl, normalizeText(item.languageTag), item.isAutoGenerated);
+      src = toSubtitleVttUrl(rawUrl);
     } catch {
       continue;
     }
diff --git a/apps/web/src/lib/proxy.ts b/apps/web/src/lib/proxy.ts
index a86d620..62a481a 100644
--- a/apps/web/src/lib/proxy.ts
+++ b/apps/web/src/lib/proxy.ts
@@ -54,40 +54,12 @@ export function proxyImage(url: string): string {
   return proxyUrl(normalized);
 }
 
-export function toSubtitleVttUrl(
-  url: string,
-  languageTag: string,
-  isAutoGenerated: boolean,
-): string {
+export function toSubtitleVttUrl(url: string): string {
   const parsed = new URL(url);
   const youtubeTimedText =
     (parsed.hostname === "youtube.com" || parsed.hostname.endsWith(".youtube.com")) &&
     parsed.pathname === "/api/timedtext";
-  if (youtubeTimedText) return youtubeSubtitleUrl(parsed, languageTag, isAutoGenerated);
   parsed.searchParams.set("fmt", "vtt");
+  if (youtubeTimedText) return parsed.toString();
   return proxyUrl(parsed.toString());
 }
-
-function youtubeSubtitleUrl(timedText: URL, languageTag: string, isAutoGenerated: boolean): string {
-  const videoId = timedText.searchParams.get("v")?.trim() ?? "";
-  const sourceLanguage = timedText.searchParams.get("lang")?.trim() ?? "";
-  const translation = timedText.searchParams.get("tlang")?.trim() ?? "";
-  const language = languageTag.trim() || translation || sourceLanguage;
-  if (!/^[A-Za-z0-9_-]{11}$/.test(videoId) || !language) {
-    throw new Error("Invalid YouTube subtitle track");
-  }
-  const auto =
-    isAutoGenerated ||
-    timedText.searchParams.get("kind") === "asr" ||
-    timedText.searchParams.get("vssId")?.startsWith("a.") === true;
-  const params = new URLSearchParams({
-    language,
-    variant: auto ? "auto" : "manual",
-    format: "vtt",
-  });
-  if (sourceLanguage) params.set("sourceLanguage", sourceLanguage);
-  if (translation) params.set("translation", translation);
-  const name = timedText.searchParams.get("name")?.trim();
-  if (name) params.set("name", name);
-  return `${absoluteBase()}/subtitles/youtube/${encodeURIComponent(videoId)}?${params}`;
-}
diff --git a/apps/web/tests/subtitle-track-utils.test.ts b/apps/web/tests/subtitle-track-utils.test.ts
index 333faba..25a6012 100644
--- a/apps/web/tests/subtitle-track-utils.test.ts
+++ b/apps/web/tests/subtitle-track-utils.test.ts
@@ -22,14 +22,10 @@ test("uses caption variants instead of numeric duplicate language labels", () =>
   ]);
 
   expect(tracks.map((track) => track.label)).toEqual(["English (CC1)", "English (DTVCC1)"]);
-  expect(tracks.every((track) => new URL(track.src).searchParams.get("format") === "vtt")).toBe(
-    true,
-  );
-  expect(tracks.every((track) => new URL(track.src).hostname === "typetype.test")).toBe(true);
-  expect(
-    tracks.every((track) => new URL(track.src).pathname === "/api/subtitles/youtube/abcdefghijk"),
-  ).toBe(true);
-  expect(tracks.every((track) => !track.src.includes("secret"))).toBe(true);
+  expect(tracks.every((track) => new URL(track.src).searchParams.get("fmt") === "vtt")).toBe(true);
+  expect(tracks.every((track) => new URL(track.src).hostname === "www.youtube.com")).toBe(true);
+  expect(tracks.every((track) => new URL(track.src).pathname === "/api/timedtext")).toBe(true);
+  expect(tracks.every((track) => track.src.includes("sig=secret"))).toBe(true);
 });
 
 test("preserves generated and translated YouTube subtitle selection", () => {
@@ -44,10 +40,11 @@ test("preserves generated and translated YouTube subtitle selection", () => {
   ]);
 
   const src = new URL(track?.src ?? "");
-  expect(src.searchParams.get("language")).toBe("fr");
-  expect(src.searchParams.get("sourceLanguage")).toBe("en");
-  expect(src.searchParams.get("translation")).toBe("fr");
-  expect(src.searchParams.get("variant")).toBe("auto");
+  expect(src.hostname).toBe("m.youtube.com");
+  expect(src.searchParams.get("fmt")).toBe("vtt");
+  expect(src.searchParams.get("lang")).toBe("en");
+  expect(src.searchParams.get("kind")).toBe("asr");
+  expect(src.searchParams.get("tlang")).toBe("fr");
 });
 
 test("keeps non YouTube subtitle tracks on the generic proxy", () => {
diff --git a/package.json b/package.json
index 55e98d2..7055b25 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@typetype/frontend",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "devDependencies": {
     "@biomejs/biome": "^2.5.7",
     "knip": "^6.32.0",