diff --git a/engine-sources.lock.json b/engine-sources.lock.json
index 593cab6..a18faa8 100644
--- a/engine-sources.lock.json
+++ b/engine-sources.lock.json
@@ -13,9 +13,9 @@
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-        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-07-28-13-32/ffmpeg-n8.1.2-31-g8c9502e9b0-win64-gpl-8.1.zip",
-        "sha256": "e88033629ebecd56d01e6b5b2e693f07d3ec3ed0d14188fc18d7d0bc9c3e6709"
+        "version": "8.1.2-34-g9b6c8969e0",
+        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-08-05-15-18/ffmpeg-n8.1.2-34-g9b6c8969e0-win64-gpl-8.1.zip",
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-        "sha256": "8f61aa8abfc2174bbb60fe0bcf7a23c7940a96d4e34c6694bf0ca48b23ce67f0"
+        "version": "8.1.2-34-g9b6c8969e0",
+        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-08-05-15-18/ffmpeg-n8.1.2-34-g9b6c8969e0-linux64-gpl-8.1.tar.xz",
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diff --git a/engines.lock.json b/engines.lock.json
index 96b84fe..565413c 100644
--- a/engines.lock.json
+++ b/engines.lock.json
@@ -16,11 +16,11 @@
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         },
         "ffmpeg": {
-          "version": "N-125840-gf6fa0d3fda",
+          "version": "N-125892-g406c5a37aa",
           "source": "https://ffmpeg.org/",
           "build": "GPLv3 build identified by binary as https://www.martin-riedl.de",
-          "url": "https://ffmpeg.martin-riedl.de/download/macos/arm64/1785265034_N-125840-gf6fa0d3fda/ffmpeg.zip",
-          "sha256": "e4fa88b19f85afa620dccc35f2bec5b41746e1bb13f1c7e6fe4c7db88391027d"
+          "url": "https://ffmpeg.martin-riedl.de/download/macos/arm64/1785661721_N-125892-g406c5a37aa/ffmpeg.zip",
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diff --git a/package-lock.json b/package-lock.json
index fd68961..67b9448 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,7 +25,7 @@
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         "@tauri-apps/plugin-opener": "^2",
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-        "lucide-react": "^1.27.0",
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-        "@types/react": "^19.2.17",
-        "@types/react-dom": "^19.2.3",
-        "@vitejs/plugin-react": "^6.0.4",
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-        "vite": "^8.1.5",
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@@ -249,9 +249,9 @@
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@@ -281,9 +281,9 @@
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@@ -332,9 +332,9 @@
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@@ -351,9 +351,9 @@
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@@ -370,9 +370,9 @@
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@@ -389,9 +389,9 @@
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@@ -408,9 +408,9 @@
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@@ -427,9 +427,9 @@
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@@ -749,6 +710,66 @@
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diff --git a/package.json b/package.json
index 343455e..b95f185 100644
--- a/package.json
+++ b/package.json
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+    "@types/react-dom": "^19.2.4",
+    "@vitejs/plugin-react": "^6.0.5",
     "autoprefixer": "^10.5.4",
-    "postcss": "^8.5.24",
+    "postcss": "^8.5.25",
     "tailwindcss": "^4.3.3",
     "typescript": "^7.0.2",
-    "vite": "^8.1.5",
+    "vite": "^8.2.0",
     "vitest": "^4.1.10"
   }
 }
diff --git a/scripts/check-updates.js b/scripts/check-updates.js
index b457e54..18c47f3 100644
--- a/scripts/check-updates.js
+++ b/scripts/check-updates.js
@@ -7,6 +7,14 @@ import { fileURLToPath } from 'node:url';
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const repoRoot = path.resolve(__dirname, '..');
 const userAgent = 'firelink-update-check';
+const fetchRetryDelaysMs = [250, 1_000];
+const fetchTimeoutMs = 30_000;
+const retryableHttpStatuses = new Set([408, 425, 429, 500, 502, 503, 504]);
+
+function httpResponseError(response, url) {
+  const status = [response.status, response.statusText].filter(Boolean).join(' ');
+  return new Error(`${status}: ${url}`);
+}
 
 function parseJsonFile(file) {
   return JSON.parse(fs.readFileSync(path.join(repoRoot, file), 'utf8'));
@@ -50,25 +58,67 @@ function npmOutdated(cwd) {
 }
 
 async function fetchJson(url) {
-  const response = await fetch(url, { headers: { 'User-Agent': userAgent } });
-  if (!response.ok) throw new Error(`${response.status} ${response.statusText}: ${url}`);
-  return response.json();
+  return fetchWithContext(url, response => response.json());
 }
 
 async function fetchText(url) {
-  const response = await fetch(url, { headers: { 'User-Agent': userAgent } });
-  if (!response.ok) throw new Error(`${response.status} ${response.statusText}: ${url}`);
-  return response.text();
+  return fetchWithContext(url, response => response.text());
+}
+
+async function fetchWithContext(url, readResponse) {
+  let lastError;
+  for (let attempt = 0; attempt <= fetchRetryDelaysMs.length; attempt += 1) {
+    let response;
+    try {
+      response = await fetch(url, {
+        headers: { 'User-Agent': userAgent },
+        signal: AbortSignal.timeout(fetchTimeoutMs),
+      });
+    } catch (error) {
+      lastError = error;
+      if (attempt === fetchRetryDelaysMs.length) break;
+      await new Promise(resolve => setTimeout(resolve, fetchRetryDelaysMs[attempt]));
+      continue;
+    }
+
+    if (!response.ok) {
+      const error = httpResponseError(response, url);
+      if (!retryableHttpStatuses.has(response.status) || attempt === fetchRetryDelaysMs.length) {
+        await response.body?.cancel();
+        throw error;
+      }
+      await response.body?.cancel();
+      lastError = error;
+      await new Promise(resolve => setTimeout(resolve, fetchRetryDelaysMs[attempt]));
+      continue;
+    }
+
+    try {
+      return await readResponse(response);
+    } catch (error) {
+      lastError = error;
+      if (attempt === fetchRetryDelaysMs.length) break;
+      await new Promise(resolve => setTimeout(resolve, fetchRetryDelaysMs[attempt]));
+    }
+  }
+  const detail = lastError instanceof Error ? lastError.message : String(lastError);
+  throw new Error(`fetch failed for ${url}: ${detail}`, { cause: lastError });
 }
 
 async function githubLatest(repo) {
-  return fetchJson(`https://api.github.com/repos/${repo}/releases/latest`);
+  const release = await fetchJson(`https://api.github.com/repos/${repo}/releases/latest`);
+  if (!release || Array.isArray(release) || typeof release.tag_name !== 'string' || !release.tag_name.trim()) {
+    throw new Error(`GitHub latest release response for ${repo} has no usable tag_name`);
+  }
+  return release;
 }
 
 async function latestFfmpegStable() {
   const html = await fetchText('https://ffmpeg.org/releases/');
   const versions = [...html.matchAll(/ffmpeg-(\d+\.\d+(?:\.\d+)?)\.tar\.xz/g)].map(match => match[1]);
-  return [...new Set(versions)].sort(compareVersions).at(-1);
+  const latest = [...new Set(versions)].sort(compareVersions).at(-1);
+  if (!latest) throw new Error('FFmpeg release page contained no usable stable release version');
+  return latest;
 }
 
 async function latestMartinRiedlMacArm64Release() {
@@ -157,7 +207,9 @@ function checkRows(rows, latestByEngine, latestByTargetEngine = {}, latestUrlsBy
   let outdated = 0;
   for (const row of rows) {
     const latest = latestByTargetEngine[`${row.target}:${row.engine}`] || latestByEngine[row.engine];
-    if (!latest) continue;
+    if (typeof latest !== 'string' || !latest.trim()) {
+      throw new Error(`Latest version is unavailable for ${row.target} ${row.engine}`);
+    }
     const current = normalizeVersion(row.version);
     const wanted = normalizeVersion(latest);
     const latestUrl = latestUrlsByTargetEngine[`${row.target}:${row.engine}`];
@@ -203,15 +255,25 @@ async function main() {
     aria2c: aria2.tag_name,
     ffmpeg,
   };
+  if (
+    !btbnFfmpegN81Build?.version ||
+    !btbnFfmpegN81Build.urls?.windows ||
+    !btbnFfmpegN81Build.urls?.linux
+  ) {
+    throw new Error('BtbN FFmpeg provider response has no complete Windows/Linux build');
+  }
+  if (!martinRiedlMacArm64Snapshot?.version || !martinRiedlMacArm64Snapshot.url) {
+    throw new Error('Martin Riedl FFmpeg provider response has no complete macOS arm64 snapshot');
+  }
   const latestByTargetEngine = {
-    'x86_64-pc-windows-msvc:ffmpeg': btbnFfmpegN81Build?.version || ffmpeg,
-    'x86_64-unknown-linux-gnu:ffmpeg': btbnFfmpegN81Build?.version || ffmpeg,
-    'aarch64-apple-darwin:ffmpeg': martinRiedlMacArm64Snapshot?.version || martinRiedlMacArm64Ffmpeg,
+    'x86_64-pc-windows-msvc:ffmpeg': btbnFfmpegN81Build.version,
+    'x86_64-unknown-linux-gnu:ffmpeg': btbnFfmpegN81Build.version,
+    'aarch64-apple-darwin:ffmpeg': martinRiedlMacArm64Snapshot.version,
   };
   const latestUrlsByTargetEngine = {
-    'x86_64-pc-windows-msvc:ffmpeg': btbnFfmpegN81Build?.urls.windows,
-    'x86_64-unknown-linux-gnu:ffmpeg': btbnFfmpegN81Build?.urls.linux,
-    'aarch64-apple-darwin:ffmpeg': martinRiedlMacArm64Snapshot?.url,
+    'x86_64-pc-windows-msvc:ffmpeg': btbnFfmpegN81Build.urls.windows,
+    'x86_64-unknown-linux-gnu:ffmpeg': btbnFfmpegN81Build.urls.linux,
+    'aarch64-apple-darwin:ffmpeg': martinRiedlMacArm64Snapshot.url,
   };
 
   console.log('\nlatest engines:');
@@ -245,7 +307,11 @@ async function main() {
   console.log('\nAll checked packages and engines are current.');
 }
 
-main().catch(error => {
-  console.error(error instanceof Error ? error.message : error);
-  process.exit(1);
-});
+if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
+  main().catch(error => {
+    console.error(error instanceof Error ? error.message : error);
+    process.exit(1);
+  });
+}
+
+export { checkRows, fetchJson, fetchText, fetchWithContext };
diff --git a/scripts/check-updates.node-test.js b/scripts/check-updates.node-test.js
new file mode 100644
index 0000000..cfff4e2
--- /dev/null
+++ b/scripts/check-updates.node-test.js
@@ -0,0 +1,53 @@
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+
+import { checkRows, fetchJson, fetchText } from './check-updates.js';
+
+async function withMockFetch(mockFetch, callback) {
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = mockFetch;
+  try {
+    return await callback();
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+}
+
+test('fetchJson retries transient HTTP responses before succeeding', async () => {
+  let attempts = 0;
+  const result = await withMockFetch(async () => {
+    attempts += 1;
+    if (attempts < 3) return new Response('temporarily unavailable', { status: 503 });
+    return new Response(JSON.stringify({ status: 'ok' }), {
+      status: 200,
+      headers: { 'Content-Type': 'application/json' },
+    });
+  }, () => fetchJson('https://example.test/releases'));
+
+  assert.deepEqual(result, { status: 'ok' });
+  assert.equal(attempts, 3);
+});
+
+test('fetchText does not retry terminal HTTP responses', async () => {
+  let attempts = 0;
+  await assert.rejects(
+    () =>
+      withMockFetch(async () => {
+        attempts += 1;
+        return new Response('not found', { status: 404 });
+      }, () => fetchText('https://example.test/missing')),
+    /404: https:\/\/example\.test\/missing/
+  );
+  assert.equal(attempts, 1);
+});
+
+test('checkRows fails closed when a latest version is unavailable', () => {
+  assert.throws(
+    () =>
+      checkRows(
+        [{ target: 'test-target', engine: 'test-engine', version: '1.0.0', url: 'https://example.test/engine' }],
+        {}
+      ),
+    /Latest version is unavailable for test-target test-engine/
+  );
+});
diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 4db3a78..61d4ae5 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -30,9 +30,9 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "1.1.4"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddd31a130427c27518df266943a5308ed92d4b226cc639f5a8f1002816174301"
+checksum = "c982642fa9e8606056828ee9a8505737230110bb1099153c79efe865c59d12ba"
 dependencies = [
  "memchr",
 ]
@@ -71,9 +71,9 @@ dependencies = [
 
 [[package]]
 name = "android_system_properties"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+checksum = "ae221649c9976a6f6c56ae1facf410f3ddb33cc661c4b7b61020a912d4237fbc"
 dependencies = [
  "libc",
 ]
@@ -938,9 +938,9 @@ dependencies = [
 
 [[package]]
 name = "data-encoding"
-version = "2.11.0"
+version = "2.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4ae5f15dda3c708c0ade84bfee31ccab44a3da4f88015ed22f63732abe300c8"
+checksum = "4583a4551df46e2792f82ceeac45e850d2e2d5debba0b91f102385cda5b11f06"
 
 [[package]]
 name = "dbus"
@@ -2006,9 +2006,9 @@ dependencies = [
 
 [[package]]
 name = "http"
-version = "1.4.2"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6970f50e31d6fc17d3fa27329444bfa74e196cf62e95052a3f6fee181dba6425"
+checksum = "918d3568bebf352712bc2ef3d46a8bcf1a75b373be6539de198e9105cbbf9ce0"
 dependencies = [
  "bytes",
  "itoa",
@@ -2051,9 +2051,9 @@ checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
 [[package]]
 name = "hybrid-array"
-version = "0.4.13"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "818356c5132c1fede50f837ca96afbe78ff42413047f4abb886217845e1b6c8c"
+checksum = "707114b52a152fa7bdb290cd7cd5912d9467273b6d74e21b8d81aca1f8533f6b"
 dependencies = [
  "typenum",
 ]
@@ -2334,9 +2334,9 @@ dependencies = [
 
 [[package]]
 name = "ipnet"
-version = "2.12.0"
+version = "2.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d98f6fed1fde3f8c21bc40a1abb88dd75e67924f9cffc3ef95607bad8017f8e2"
+checksum = "6a756c3fac73139e83f14c2d742155dd2b78d3ee56597b419a0579b7bdd6dd78"
 
 [[package]]
 name = "is-docker"
@@ -2591,9 +2591,9 @@ dependencies = [
 
 [[package]]
 name = "libredox"
-version = "0.1.18"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c943259e342f1e06ff2da7a83eabdfe7f92ce10262688dbf1895ff0b3e6e4652"
+checksum = "2026a5056764a10b2bf5d56488cba40da507f5493a6a429340e2004d9ed085fa"
 dependencies = [
  "libc",
 ]
@@ -3192,9 +3192,9 @@ checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
 [[package]]
 name = "open"
-version = "5.4.0"
+version = "5.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a0b3d059e795d52b8a72fef45658620edd4d9c359b338564aa14391ffa511ed5"
+checksum = "f9cfef937e9c486488c7e3d949ae31c0f1d06bdacd75b99c086cb35356e30408"
 dependencies = [
  "dunce",
  "is-wsl",
@@ -3700,7 +3700,7 @@ version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f020237b6c8eed93db2e2cb53c00c60a8e1bc73da7d073199a1180401450218d"
 dependencies = [
- "aho-corasick 1.1.4",
+ "aho-corasick 1.1.5",
  "memchr",
  "regex-automata",
  "regex-syntax 0.8.11",
@@ -3708,11 +3708,11 @@ dependencies = [
 
 [[package]]
 name = "regex-automata"
-version = "0.4.16"
+version = "0.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8fcfdb36bda0c880c5931cdc7a2bcdc8ba4556847b9d912bca70bc94708711ad"
+checksum = "ad8553b9b26413251cbf30e620595c7a41b3887f03da04579c0e6b0d6a06b4b2"
 dependencies = [
- "aho-corasick 1.1.4",
+ "aho-corasick 1.1.5",
  "memchr",
  "regex-syntax 0.8.11",
 ]
@@ -3874,9 +3874,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.42"
+version = "0.23.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c54fcab019b409d04215d3a17cb438fd7fbf192ee61461f20f4fe18704bc138"
+checksum = "0283386ce02abc0151e1761d08802dfe86c173b0b494af5cbc086574e453da06"
 dependencies = [
  "once_cell",
  "ring",
@@ -5213,9 +5213,9 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.54"
+version = "0.3.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e1d5e639ff6bab73cb6885cc7e7b1de96c3f32c68ec55f3952614bec1092244"
+checksum = "cdb87b95ec50ddfa440816d227a17b2ccbdda963a316a727fda0fc4334f7d134"
 dependencies = [
  "deranged",
  "libc",
@@ -5295,13 +5295,13 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "2.7.1"
+version = "2.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6328af13490e73a9b4694030fafd93f8c8c6a9dede33e821c3fc63eddf8042ba"
+checksum = "78773a2a397f451582ce068015985c33193cf6dea8b74d2a639fe457b2f07b0e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.119",
+ "syn 3.0.3",
 ]
 
 [[package]]
diff --git a/src-tauri/binaries/ffmpeg-aarch64-apple-darwin b/src-tauri/binaries/ffmpeg-aarch64-apple-darwin
index 6f8ecd9..82927b0 100755
Binary files a/src-tauri/binaries/ffmpeg-aarch64-apple-darwin and b/src-tauri/binaries/ffmpeg-aarch64-apple-darwin differ