diff --git a/engine-sources.lock.json b/engine-sources.lock.json
index 9821dc8..a4be654 100644
--- a/engine-sources.lock.json
+++ b/engine-sources.lock.json
@@ -13,9 +13,9 @@
         "sha256": "15e5300b0ba3c3695a7621d90160a746ec9e710228cee639afa9d580f6e3cd11"
       },
       "ffmpeg": {
-        "version": "8.1.2-50-g1a748fe2cd",
-        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-09-02-13-13/ffmpeg-n8.1.2-50-g1a748fe2cd-win64-gpl-8.1.zip",
-        "sha256": "954c2f5a219d6d34280393ceaf611777f6fcc96b785263328fb263df35dc1f8a"
+        "version": "9.0.1-11-ge47273f4d9",
+        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-09-04-14-01/ffmpeg-n9.0.1-11-ge47273f4d9-win64-gpl-9.0.zip",
+        "sha256": "41d735c9364a8deda25b3bd5f05abf37720316be9495edfe94f51bc088ce9d86"
       },
       "aria2c": {
         "version": "1.37.0",
@@ -35,9 +35,9 @@
         "sha256": "394f07f4da2bebe6ce6f1e7ce0fa16429b29b08c35e3fac3fe25972676dff4b2"
       },
       "ffmpeg": {
-        "version": "8.1.2-50-g1a748fe2cd",
-        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-09-02-13-13/ffmpeg-n8.1.2-50-g1a748fe2cd-linux64-gpl-8.1.tar.xz",
-        "sha256": "f3b7cc13863b6e934c5245c12383bec545490f49a3ccf6bf90ac42c55dd76f10"
+        "version": "9.0.1-11-ge47273f4d9",
+        "url": "https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-09-04-14-01/ffmpeg-n9.0.1-11-ge47273f4d9-linux64-gpl-9.0.tar.xz",
+        "sha256": "1a4fa0f89f690bd81bddbb7cf3a65554095e8e9f9dc98693494e6f5fb97918c5"
       },
       "aria2c": {
         "version": "1.37.0",
diff --git a/engines.lock.json b/engines.lock.json
index 664d6b3..b96edfe 100644
--- a/engines.lock.json
+++ b/engines.lock.json
@@ -22,11 +22,12 @@
           "sha256": "b6e51125007860e1a58c75737faa2cd0d1d5372c1c9ca82d1bf87d2c40081aac"
         },
         "ffmpeg": {
-          "version": "N-126314-g3386acd2f9",
+          "version": "9.0.1",
           "source": "https://ffmpeg.org/",
-          "build": "GPLv3 build identified by binary as https://www.martin-riedl.de",
-          "url": "https://ffmpeg.martin-riedl.de/download/macos/arm64/1788094033_N-126314-g3386acd2f9/ffmpeg.zip",
-          "sha256": "d817e43743539cd78755eac32478b5deff95e35a105e44e75758395d6b26e181"
+          "build": "Stable GPLv3 build identified by binary as https://www.martin-riedl.de",
+          "url": "https://ffmpeg.martin-riedl.de/download/macos/arm64/1787073674_9.0.1/ffmpeg.zip",
+          "sourceSha256": "8287a1b2229e05eb41859f073e18e6c52c60a778f2f5e6881070fe51b79407fe",
+          "sha256": "393e4c395020a1cb7cbd77fbe00599ce69d1c6466fee0dbd59d13f86a81a1611"
         },
         "deno": {
           "version": "2.9.6",
diff --git a/scripts/check-updates.js b/scripts/check-updates.js
index c86aaa4..cc8f889 100644
--- a/scripts/check-updates.js
+++ b/scripts/check-updates.js
@@ -324,7 +324,14 @@ function sourceEngineVersions(sourceLock) {
   const rows = [];
   for (const [target, engines] of Object.entries(sourceLock.targets || {})) {
     for (const [engine, meta] of Object.entries(engines)) {
-      rows.push({ target, engine, version: meta.version, url: meta.url, sha256: meta.sha256 });
+      rows.push({
+        target,
+        engine,
+        version: meta.version,
+        url: meta.url,
+        sha256: meta.sha256,
+        sourceSha256: meta.sourceSha256,
+      });
     }
   }
   return rows;
@@ -334,7 +341,14 @@ function packagedEngineVersions(engineLock) {
   const rows = [];
   for (const [target, targetLock] of Object.entries(engineLock.targets || {})) {
     for (const [engine, meta] of Object.entries(targetLock.engines || {})) {
-      rows.push({ target, engine, version: meta.version, url: meta.url, sha256: meta.sha256 });
+      rows.push({
+        target,
+        engine,
+        version: meta.version,
+        url: meta.url,
+        sha256: meta.sha256,
+        sourceSha256: meta.sourceSha256,
+      });
     }
   }
   return rows;
@@ -373,7 +387,8 @@ function checkRows(
     const versionOutdated = compareVersions(current, wanted) < 0;
     const sourceOutdated = Boolean(latestUrl && row.url && row.url !== latestUrl);
     const latestHash = latestHashesByTargetEngine[targetKey] || latestHashesByUrl[row.url];
-    const currentHash = typeof row.sha256 === 'string' ? row.sha256.toLowerCase() : '';
+    const checkedHash = row.sourceSha256 || row.sha256;
+    const currentHash = typeof checkedHash === 'string' ? checkedHash.toLowerCase() : '';
     const hashOutdated = Boolean(latestHash && currentHash !== latestHash);
     const status = versionOutdated
       ? 'outdated'
@@ -385,7 +400,7 @@ function checkRows(
     if (status !== 'current') outdated += 1;
     console.log(`  ${row.target} ${row.engine}: ${current} -> ${wanted} ${status}`);
     if (sourceOutdated) console.log(`    source: ${row.url} -> ${latestUrl}`);
-    if (hashOutdated) console.log(`    sha256: ${row.sha256 || 'missing'} -> ${latestHash}`);
+    if (hashOutdated) console.log(`    source sha256: ${checkedHash || 'missing'} -> ${latestHash}`);
   }
   return outdated;
 }
diff --git a/scripts/check-updates.node-test.js b/scripts/check-updates.node-test.js
index e8d18ea..ea2ecfc 100644
--- a/scripts/check-updates.node-test.js
+++ b/scripts/check-updates.node-test.js
@@ -95,6 +95,26 @@ test('checkRows detects a provider hash change when version and URL are current'
   assert.equal(outdated, 1);
 });
 
+test('checkRows compares packaged source provenance without confusing the payload digest', () => {
+  const outdated = checkRows(
+    [{
+      target: 'aarch64-apple-darwin',
+      engine: 'ffmpeg',
+      version: '9.0.1',
+      url: 'https://example.test/ffmpeg.zip',
+      sourceSha256: 'a'.repeat(64),
+      sha256: 'b'.repeat(64),
+    }],
+    { ffmpeg: '9.0.1' },
+    { 'aarch64-apple-darwin:ffmpeg': '9.0.1' },
+    { 'aarch64-apple-darwin:ffmpeg': 'https://example.test/ffmpeg.zip' },
+    new Set(['ffmpeg']),
+    { 'aarch64-apple-darwin:ffmpeg': 'a'.repeat(64) },
+  );
+
+  assert.equal(outdated, 0);
+});
+
 test('checkRows detects an aria2 asset digest change when the provider supplies it', () => {
   const url = 'https://github.com/aria2/aria2/releases/download/release-1.37.0/aria2-1.37.0-win-64bit-build1.zip';
   const digest = 'b'.repeat(64);
diff --git a/scripts/engine-download.node-test.js b/scripts/engine-download.node-test.js
index 6bc77f4..0edbb1d 100644
--- a/scripts/engine-download.node-test.js
+++ b/scripts/engine-download.node-test.js
@@ -225,3 +225,32 @@ test('propagates external cancellation without retrying an in-flight archive', a
     fs.rmSync(directory, { recursive: true, force: true });
   }
 });
+
+test('rejects and removes an archive with a mismatched checksum', async () => {
+  const { directory, archive } = makeArchivePath();
+  const corrupt = Buffer.from('corrupt engine archive');
+
+  try {
+    await withMockFetch(
+      async () => new Response(corrupt, {
+        status: 200,
+        headers: { 'Content-Length': String(corrupt.length) },
+      }),
+      async () => {
+        await assert.rejects(
+          downloadEngineArchive({
+            name: 'ffmpeg',
+            url: 'https://example.test/ffmpeg.zip',
+            archive,
+            expectedSha256: digest(Buffer.from('trusted engine archive')),
+            attempts: 1,
+          }),
+          /Archive checksum mismatch for ffmpeg/,
+        );
+      },
+    );
+    assert.equal(fs.existsSync(archive), false);
+  } finally {
+    fs.rmSync(directory, { recursive: true, force: true });
+  }
+});
diff --git a/src-tauri/binaries/ffmpeg-aarch64-apple-darwin b/src-tauri/binaries/ffmpeg-aarch64-apple-darwin
index dad02c5..30be566 100755
Binary files a/src-tauri/binaries/ffmpeg-aarch64-apple-darwin and b/src-tauri/binaries/ffmpeg-aarch64-apple-darwin differ
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 9782f44..6f3ad6e 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -17925,6 +17925,13 @@ mod tests {
         assert_eq!(parse_ffmpeg_version(output), Some("8.1.2".to_string()));
     }
 
+    #[test]
+    fn parses_martin_riedl_ffmpeg_nine_stable_version() {
+        let output = "ffmpeg version 9.0.1-https://www.martin-riedl.de Copyright (c) 2000-2026 the FFmpeg developers";
+
+        assert_eq!(parse_ffmpeg_version(output), Some("9.0.1".to_string()));
+    }
+
     #[test]
     fn uses_fragment_progress_instead_of_temporary_hls_size_estimates() {
         let line = format!(