diff --git a/.bun-version b/.bun-version
index 3c80e4f0..e1df5de7 100644
--- a/.bun-version
+++ b/.bun-version
@@ -1 +1 @@
-1.4.3
\ No newline at end of file
+1.4.4
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index e4792c3a..acb74f93 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM oven/bun:1.4.3-slim AS base
+FROM oven/bun:1.4.4-slim AS base
 WORKDIR /app
 COPY package.json bun.lock /app/
 RUN bun install --frozen-lockfile
diff --git a/mise.toml b/mise.toml
index cfb78577..40a490fb 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,5 +1,5 @@
 [tools]
-bun = "1.4.3"
+bun = "1.4.4"
 
 [env]
 JWT_SECRET = "aLongAndSecretStringUsedToSignTheJSONWebToken1234"
diff --git a/package.json b/package.json
index c75bdcae..fddcd89e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "convertx-frontend",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "scripts": {
     "dev": "bun run --watch src/index.tsx",
     "hot": "bun run --hot src/index.tsx",
diff --git a/src/converters/ffmpeg.ts b/src/converters/ffmpeg.ts
index 6182cdf5..8d5709a6 100644
--- a/src/converters/ffmpeg.ts
+++ b/src/converters/ffmpeg.ts
@@ -721,7 +721,7 @@ export async function convert(
   let extraArgs: string[] = [];
   let message = "Done";
 
-  const audioFormatsWithCover = ["m4a", "mp3", "flac", "ogg"];
+  const audioFormatsWithCover = ["m4a", "m4b", "mp3", "flac", "ogg"];
   const audioFormatsNoCover = ["wav", "aac"];
 
   if (audioFormatsWithCover.includes(convertTo)) {
diff --git a/tests/converters/ffmpeg.test.ts b/tests/converters/ffmpeg.test.ts
index 8fff82eb..955e2a0a 100644
--- a/tests/converters/ffmpeg.test.ts
+++ b/tests/converters/ffmpeg.test.ts
@@ -89,23 +89,26 @@ test.each([
   expect(calls[0]).toEqual(["-i", "in.mkv", "-c:v", codec, "out.video"]);
 });
 
-test.each(["m4a", "mp3", "flac", "ogg"])("keeps embedded cover art for %s output", async (ext) => {
-  await convert("in.wav", "wav", ext, `out.${ext}`, undefined, mockExecFile);
+test.each(["m4a", "m4b", "mp3", "flac", "ogg"])(
+  "keeps embedded cover art for %s output",
+  async (ext) => {
+    await convert("in.mp3", "mp3", ext, `out.${ext}`, undefined, mockExecFile);
 
-  expect(calls[0]).toEqual([
-    "-i",
-    "in.wav",
-    "-map",
-    "0:a",
-    "-map",
-    "0:v:disp:attached_pic?",
-    "-c:v",
-    "copy",
-    "-disposition:v",
-    "attached_pic",
-    `out.${ext}`,
-  ]);
-});
+    expect(calls[0]).toEqual([
+      "-i",
+      "in.mp3",
+      "-map",
+      "0:a",
+      "-map",
+      "0:v:disp:attached_pic?",
+      "-c:v",
+      "copy",
+      "-disposition:v",
+      "attached_pic",
+      `out.${ext}`,
+    ]);
+  },
+);
 
 test.each(["wav", "aac"])("drops video streams for %s output", async (ext) => {
   await convert("in.mp3", "mp3", ext, `out.${ext}`, undefined, mockExecFile);