diff --git a/BillNote_frontend/src-tauri/tauri.conf.json b/BillNote_frontend/src-tauri/tauri.conf.json
index eb432d1..2993263 100644
--- a/BillNote_frontend/src-tauri/tauri.conf.json
+++ b/BillNote_frontend/src-tauri/tauri.conf.json
@@ -1,7 +1,7 @@
 {
   "$schema": "../node_modules/@tauri-apps/cli/config.schema.json",
   "productName": "BiliNote",
-  "version": "2.4.4",
+  "version": "2.4.5",
   "identifier": "com.jefferyhuang.bilinote",
   "build": {
     "frontendDist": "../dist",
@@ -43,4 +43,4 @@
       "icons/icon.png"
     ]
   }
-}
\ No newline at end of file
+}
diff --git a/backend/tests/test_youtube_metadata_only.py b/backend/tests/test_youtube_metadata_only.py
index c2e807e..34b5fa5 100644
--- a/backend/tests/test_youtube_metadata_only.py
+++ b/backend/tests/test_youtube_metadata_only.py
@@ -31,7 +31,11 @@ def _stub(name, **attrs):
     module = types.ModuleType(name)
     for key, value in attrs.items():
         setattr(module, key, value)
-    sys.modules.setdefault(name, module)
+    # Tests in this repository load downloader modules with lightweight app
+    # stubs. Replace a previous test's stub instead of inheriting it; otherwise
+    # a prior import can leave AudioDownloadResult as ``object`` and turn this
+    # metadata-only test into a TypeError unrelated to the behavior under test.
+    sys.modules[name] = module
     return module