diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index cf5dca4d9065..3fff3bce7235 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-45b66b722e1275c47dccbe6b002c8e4cb13ea983
+ffba2f68d4e8ec2041f57226d907dcb929c8b795
diff --git a/packages/flutter/test/widgets/gesture_detector_semantics_test.dart b/packages/flutter/test/widgets/gesture_detector_semantics_test.dart
index dc9796f55dfd..d8d9451dbe9c 100644
--- a/packages/flutter/test/widgets/gesture_detector_semantics_test.dart
+++ b/packages/flutter/test/widgets/gesture_detector_semantics_test.dart
@@ -714,7 +714,7 @@ class _TestLayoutPerformer extends SingleChildRenderObjectWidget {
 class _RenderTestLayoutPerformer extends RenderBox {
   _RenderTestLayoutPerformer({VoidCallback performLayout}) : _performLayout = performLayout;
 
-  VoidCallback _performLayout;
+  final VoidCallback _performLayout;
 
   @override
   void performLayout() {