diff --git a/src/webdrop_bridge/ui/main_window.py b/src/webdrop_bridge/ui/main_window.py
index 3de11da..cf51394 100644
--- a/src/webdrop_bridge/ui/main_window.py
+++ b/src/webdrop_bridge/ui/main_window.py
@@ -5,7 +5,7 @@ import logging
 from pathlib import Path
 from typing import Optional
 
-from PySide6.QtCore import QSize, Qt, QThread, QUrl, Signal
+from PySide6.QtCore import QObject, QSize, Qt, QThread, QUrl, Signal
 from PySide6.QtWidgets import QLabel, QMainWindow, QStatusBar, QToolBar, QVBoxLayout, QWidget
 
 from webdrop_bridge.config import Config
@@ -657,9 +657,14 @@ class MainWindow(QMainWindow):
             logger.error("Failed to launch update installer")
 
 
-class UpdateCheckWorker:
+class UpdateCheckWorker(QObject):
     """Worker for running update check asynchronously."""
 
+    # Define signals at class level
+    update_available = Signal(object)  # Emits Release object
+    update_status = Signal(str, str)   # Emits (status_text, emoji)
+    finished = Signal()
+
     def __init__(self, manager, current_version: str):
         """Initialize worker.
         
@@ -667,14 +672,9 @@ class UpdateCheckWorker:
             manager: UpdateManager instance
             current_version: Current app version
         """
+        super().__init__()
         self.manager = manager
         self.current_version = current_version
-        
-        # Create signals
-        from PySide6.QtCore import Signal
-        self.update_available = Signal(object)
-        self.update_status = Signal(str, str)
-        self.finished = Signal()
 
     def run(self) -> None:
         """Run the update check."""
diff --git a/tests/integration/test_update_flow.py b/tests/integration/test_update_flow.py
index 5dc4ae6..e6c640c 100644
--- a/tests/integration/test_update_flow.py
+++ b/tests/integration/test_update_flow.py
@@ -97,6 +97,8 @@ class TestUpdateFlowIntegration:
             assert mock_fetch.call_count == 1  # Still 1, cache used
 
             # Verify both got same result
+            assert release1 is not None
+            assert release2 is not None
             assert release1.version == release2.version
 
     @pytest.mark.asyncio
@@ -164,6 +166,7 @@ class TestUpdateFlowIntegration:
             release = await manager.check_for_updates()
 
             # Version should be extracted correctly (without 'v')
+            assert release is not None
             assert release.version == "1.2.3"
 
     @pytest.mark.asyncio
@@ -180,6 +183,7 @@ class TestUpdateFlowIntegration:
             release = await manager.check_for_updates()
 
             # Should have both exe and checksum
+            assert release is not None
             assert len(release.assets) == 2
             asset_names = [a["name"] for a in release.assets]
             assert "WebDropBridge.exe" in asset_names
@@ -199,5 +203,6 @@ class TestUpdateFlowIntegration:
             release = await manager.check_for_updates()
 
             # Changelog should be available
+            assert release is not None
             assert release.body == mock_forgejo_response["body"]
             assert "Bug Fixes" in release.body