diff --git a/engine/src/flutter/lib/ui/hooks.dart b/engine/src/flutter/lib/ui/hooks.dart
index be95488031..5ba01a6ca8 100644
--- a/engine/src/flutter/lib/ui/hooks.dart
+++ b/engine/src/flutter/lib/ui/hooks.dart
@@ -125,7 +125,7 @@ void _runMainZoned(Function startMainIsolateFunction,
   startMainIsolateFunction(() {
     runZonedGuarded<void>(() {
       if (userMainFunction is _ListStringArgFunction) {
-        (userMainFunction as dynamic)(args);
+        userMainFunction(args);
       } else {
         userMainFunction();
       }
@@ -233,7 +233,7 @@ bool _isLoopback(String host) {
 @pragma('vm:entry-point')
 void Function(Uri) _getHttpConnectionHookClosure(bool mayInsecurelyConnectToAllDomains) {
   return (Uri uri) {
-      final dynamic zoneOverride = Zone.current[#flutter.io.allow_http];
+      final Object? zoneOverride = Zone.current[#flutter.io.allow_http];
       if (zoneOverride == true) {
         return;
       }
diff --git a/engine/src/flutter/lib/ui/natives.dart b/engine/src/flutter/lib/ui/natives.dart
index 07eb5f099a..312593daea 100644
--- a/engine/src/flutter/lib/ui/natives.dart
+++ b/engine/src/flutter/lib/ui/natives.dart
@@ -9,11 +9,11 @@
 part of dart.ui;
 
 // Corelib 'print' implementation.
-void _print(dynamic arg) {
+void _print(Object? arg) {
   _Logger._printString(arg.toString());
 }
 
-void _printDebug(dynamic arg) {
+void _printDebug(Object? arg) {
   _Logger._printDebugString(arg.toString());
 }
 
diff --git a/engine/src/flutter/lib/ui/painting.dart b/engine/src/flutter/lib/ui/painting.dart
index 5ef0fd4ccb..9f6763f206 100644
--- a/engine/src/flutter/lib/ui/painting.dart
+++ b/engine/src/flutter/lib/ui/painting.dart
@@ -1107,6 +1107,7 @@ class Paint {
   // The binary format must match the deserialization code in paint.cc.
 
   final ByteData _data = ByteData(_kDataByteCount);
+
   static const int _kIsAntiAliasIndex = 0;
   static const int _kColorIndex = 1;
   static const int _kBlendModeIndex = 2;
@@ -1140,10 +1141,10 @@ class Paint {
   static const int _kDataByteCount = 56;
 
   // Binary format must match the deserialization code in paint.cc.
-  List<dynamic>? _objects;
+  List<Object?>? _objects;
 
-  List<dynamic> _ensureObjectsInitialized() {
-    return _objects ??= List<dynamic>.filled(_kObjectCount, null, growable: false);
+  List<Object?> _ensureObjectsInitialized() {
+    return _objects ??= List<Object?>.filled(_kObjectCount, null, growable: false);
   }
 
   static const int _kShaderIndex = 0;
@@ -1409,7 +1410,8 @@ class Paint {
   ///
   /// When a shape is being drawn, [colorFilter] overrides [color] and [shader].
   ColorFilter? get colorFilter {
-    return _objects?[_kColorFilterIndex]?.creator as ColorFilter?;
+    final _ColorFilter? nativeFilter = _objects?[_kColorFilterIndex] as _ColorFilter?;
+    return nativeFilter?.creator;
   }
 
   set colorFilter(ColorFilter? value) {
@@ -1446,7 +1448,8 @@ class Paint {
   ///
   ///  * [MaskFilter], which is used for drawing geometry.
   ImageFilter? get imageFilter {
-    return _objects?[_kImageFilterIndex]?.creator as ImageFilter?;
+    final _ImageFilter? nativeFilter = _objects?[_kImageFilterIndex] as _ImageFilter?;
+    return nativeFilter?.creator;
   }
 
   set imageFilter(ImageFilter? value) {
@@ -1455,8 +1458,9 @@ class Paint {
         _objects![_kImageFilterIndex] = null;
       }
     } else {
-      final List<dynamic> objects = _ensureObjectsInitialized();
-      if (objects[_kImageFilterIndex]?.creator != value) {
+      final List<Object?> objects = _ensureObjectsInitialized();
+      final _ImageFilter? imageFilter = objects[_kImageFilterIndex] as _ImageFilter?;
+      if (imageFilter?.creator != value) {
         objects[_kImageFilterIndex] = value._toNativeImageFilter();
       }
     }
@@ -4247,13 +4251,13 @@ class Canvas extends NativeFieldWrapperClass1 {
                  paint._objects, paint._data);
     }
   }
-  void _saveLayerWithoutBounds(List<dynamic>? paintObjects, ByteData paintData)
+  void _saveLayerWithoutBounds(List<Object?>? paintObjects, ByteData paintData)
       native 'Canvas_saveLayerWithoutBounds';
   void _saveLayer(double left,
                   double top,
                   double right,
                   double bottom,
-                  List<dynamic>? paintObjects,
+                  List<Object?>? paintObjects,
                   ByteData paintData) native 'Canvas_saveLayer';
 
   /// Pops the current save stack, if there is anything to pop.
@@ -4384,7 +4388,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                  double y1,
                  double x2,
                  double y2,
-                 List<dynamic>? paintObjects,
+                 List<Object?>? paintObjects,
                  ByteData paintData) native 'Canvas_drawLine';
 
   /// Fills the canvas with the given [Paint].
@@ -4395,7 +4399,7 @@ class Canvas extends NativeFieldWrapperClass1 {
     assert(paint != null);
     _drawPaint(paint._objects, paint._data);
   }
-  void _drawPaint(List<dynamic>? paintObjects, ByteData paintData) native 'Canvas_drawPaint';
+  void _drawPaint(List<Object?>? paintObjects, ByteData paintData) native 'Canvas_drawPaint';
 
   /// Draws a rectangle with the given [Paint]. Whether the rectangle is filled
   /// or stroked (or both) is controlled by [Paint.style].
@@ -4409,7 +4413,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                  double top,
                  double right,
                  double bottom,
-                 List<dynamic>? paintObjects,
+                 List<Object?>? paintObjects,
                  ByteData paintData) native 'Canvas_drawRect';
 
   /// Draws a rounded rectangle with the given [Paint]. Whether the rectangle is
@@ -4420,7 +4424,7 @@ class Canvas extends NativeFieldWrapperClass1 {
     _drawRRect(rrect._getValue32(), paint._objects, paint._data);
   }
   void _drawRRect(Float32List rrect,
-                  List<dynamic>? paintObjects,
+                  List<Object?>? paintObjects,
                   ByteData paintData) native 'Canvas_drawRRect';
 
   /// Draws a shape consisting of the difference between two rounded rectangles
@@ -4436,7 +4440,7 @@ class Canvas extends NativeFieldWrapperClass1 {
   }
   void _drawDRRect(Float32List outer,
                    Float32List inner,
-                   List<dynamic>? paintObjects,
+                   List<Object?>? paintObjects,
                    ByteData paintData) native 'Canvas_drawDRRect';
 
   /// Draws an axis-aligned oval that fills the given axis-aligned rectangle
@@ -4452,7 +4456,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                  double top,
                  double right,
                  double bottom,
-                 List<dynamic>? paintObjects,
+                 List<Object?>? paintObjects,
                  ByteData paintData) native 'Canvas_drawOval';
 
   /// Draws a circle centered at the point given by the first argument and
@@ -4467,7 +4471,7 @@ class Canvas extends NativeFieldWrapperClass1 {
   void _drawCircle(double x,
                    double y,
                    double radius,
-                   List<dynamic>? paintObjects,
+                   List<Object?>? paintObjects,
                    ByteData paintData) native 'Canvas_drawCircle';
 
   /// Draw an arc scaled to fit inside the given rectangle.
@@ -4494,7 +4498,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                 double startAngle,
                 double sweepAngle,
                 bool useCenter,
-                List<dynamic>? paintObjects,
+                List<Object?>? paintObjects,
                 ByteData paintData) native 'Canvas_drawArc';
 
   /// Draws the given [Path] with the given [Paint].
@@ -4508,7 +4512,7 @@ class Canvas extends NativeFieldWrapperClass1 {
     _drawPath(path, paint._objects, paint._data);
   }
   void _drawPath(Path path,
-                 List<dynamic>? paintObjects,
+                 List<Object?>? paintObjects,
                  ByteData paintData) native 'Canvas_drawPath';
 
   /// Draws the given [Image] into the canvas with its top-left corner at the
@@ -4522,7 +4526,7 @@ class Canvas extends NativeFieldWrapperClass1 {
   void _drawImage(_Image image,
                   double x,
                   double y,
-                  List<dynamic>? paintObjects,
+                  List<Object?>? paintObjects,
                   ByteData paintData,
                   int filterQualityIndex) native 'Canvas_drawImage';
 
@@ -4562,7 +4566,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                       double dstTop,
                       double dstRight,
                       double dstBottom,
-                      List<dynamic>? paintObjects,
+                      List<Object?>? paintObjects,
                       ByteData paintData,
                       int filterQualityIndex) native 'Canvas_drawImageRect';
 
@@ -4606,7 +4610,7 @@ class Canvas extends NativeFieldWrapperClass1 {
                       double dstTop,
                       double dstRight,
                       double dstBottom,
-                      List<dynamic>? paintObjects,
+                      List<Object?>? paintObjects,
                       ByteData paintData,
                       int filterQualityIndex) native 'Canvas_drawImageNine';
 
@@ -4677,7 +4681,7 @@ class Canvas extends NativeFieldWrapperClass1 {
     _drawPoints(paint._objects, paint._data, pointMode.index, points);
   }
 
-  void _drawPoints(List<dynamic>? paintObjects,
+  void _drawPoints(List<Object?>? paintObjects,
                    ByteData paintData,
                    int pointMode,
                    Float32List points) native 'Canvas_drawPoints';
@@ -4711,7 +4715,7 @@ class Canvas extends NativeFieldWrapperClass1 {
   }
   void _drawVertices(Vertices vertices,
                      int blendMode,
-                     List<dynamic>? paintObjects,
+                     List<Object?>? paintObjects,
                      ByteData paintData) native 'Canvas_drawVertices';
 
   /// Draws many parts of an image - the [atlas] - onto the canvas.
@@ -5060,7 +5064,7 @@ class Canvas extends NativeFieldWrapperClass1 {
     );
   }
 
-  void _drawAtlas(List<dynamic>? paintObjects,
+  void _drawAtlas(List<Object?>? paintObjects,
                   ByteData paintData,
                   int filterQualityIndex,
                   _Image atlas,
diff --git a/engine/src/flutter/lib/ui/platform_dispatcher.dart b/engine/src/flutter/lib/ui/platform_dispatcher.dart
index 978792033f..36deee6632 100644
--- a/engine/src/flutter/lib/ui/platform_dispatcher.dart
+++ b/engine/src/flutter/lib/ui/platform_dispatcher.dart
@@ -866,20 +866,20 @@ class PlatformDispatcher {
 
   // Called from the engine, via hooks.dart
   void _updateUserSettingsData(String jsonData) {
-    final Map<String, dynamic> data = json.decode(jsonData) as Map<String, dynamic>;
+    final Map<String, Object?> data = json.decode(jsonData) as Map<String, Object?>;
     if (data.isEmpty) {
       return;
     }
 
-    final double textScaleFactor = (data['textScaleFactor'] as num).toDouble();
-    final bool alwaysUse24HourFormat = data['alwaysUse24HourFormat'] as bool;
+    final double textScaleFactor = (data['textScaleFactor']! as num).toDouble();
+    final bool alwaysUse24HourFormat = data['alwaysUse24HourFormat']! as bool;
     // This field is optional.
     final bool? brieflyShowPassword = data['brieflyShowPassword'] as bool?;
     if (brieflyShowPassword != null) {
       _brieflyShowPassword = brieflyShowPassword;
     }
     final Brightness platformBrightness =
-    data['platformBrightness'] as String == 'dark' ? Brightness.dark : Brightness.light;
+    data['platformBrightness']! as String == 'dark' ? Brightness.dark : Brightness.light;
     final PlatformConfiguration previousConfiguration = configuration;
     final bool platformBrightnessChanged =
         previousConfiguration.platformBrightness != platformBrightness;
diff --git a/engine/src/flutter/lib/ui/text.dart b/engine/src/flutter/lib/ui/text.dart
index 64103c4263..f77ea978f9 100644
--- a/engine/src/flutter/lib/ui/text.dart
+++ b/engine/src/flutter/lib/ui/text.dart
@@ -2823,7 +2823,7 @@ class ParagraphBuilder extends NativeFieldWrapperClass1 {
     Int32List encoded,
     ByteData? strutData,
     String? fontFamily,
-    List<dynamic>? strutFontFamily,
+    List<Object?>? strutFontFamily,
     double? fontSize,
     double? height,
     String? ellipsis,
@@ -2888,16 +2888,16 @@ class ParagraphBuilder extends NativeFieldWrapperClass1 {
 
   void _pushStyle(
     Int32List encoded,
-    List<dynamic> fontFamilies,
+    List<Object?> fontFamilies,
     double? fontSize,
     double? letterSpacing,
     double? wordSpacing,
     double? height,
     double? decorationThickness,
     String locale,
-    List<dynamic>? backgroundObjects,
+    List<Object?>? backgroundObjects,
     ByteData? backgroundData,
-    List<dynamic>? foregroundObjects,
+    List<Object?>? foregroundObjects,
     ByteData? foregroundData,
     ByteData shadowsData,
     ByteData? fontFeaturesData,
@@ -3015,7 +3015,7 @@ Future<void> loadFontFromList(Uint8List list, {String? fontFamily}) {
 }
 
 final ByteData _fontChangeMessage = utf8.encoder.convert(
-  json.encode(<String, dynamic>{'type': 'fontsChange'})
+  json.encode(<String, Object?>{'type': 'fontsChange'})
 ).buffer.asByteData();
 
 FutureOr<void> _sendFontChangeMessage() async {