diff --git a/external/Avalonia.DBus b/external/Avalonia.DBus
index f91a822c25..864a052828 160000
--- a/external/Avalonia.DBus
+++ b/external/Avalonia.DBus
@@ -1 +1 @@
-Subproject commit f91a822c258476f185e51112388775591e6ef9d6
+Subproject commit 864a05282841bf04006890f04d11d60d1a046aa9
diff --git a/src/Avalonia.FreeDesktop.AtSpi/AtSpiServer.cs b/src/Avalonia.FreeDesktop.AtSpi/AtSpiServer.cs
index 16d36eb590..06b9b7aa3f 100644
--- a/src/Avalonia.FreeDesktop.AtSpi/AtSpiServer.cs
+++ b/src/Avalonia.FreeDesktop.AtSpi/AtSpiServer.cs
@@ -61,7 +61,7 @@ namespace Avalonia.FreeDesktop.AtSpi
                 _isEmbedded = false;
             }
 
-            _syncContext = new AvaloniaSynchronizationContext(DispatcherPriority.Normal);
+            _syncContext = new AvaloniaSynchronizationContext(Dispatcher.UIThread, DispatcherPriority.Default);
 
             var address = await GetAccessibilityBusAddressAsync();