diff --git a/examples/ui_3d/android/app/src/main/AndroidManifest.xml b/examples/ui_3d/android/app/src/main/AndroidManifest.xml
index da3263e..b763e59 100644
--- a/examples/ui_3d/android/app/src/main/AndroidManifest.xml
+++ b/examples/ui_3d/android/app/src/main/AndroidManifest.xml
@@ -6,7 +6,6 @@
          additional functionality it is fine to subclass or reimplement
          FlutterApplication and put your custom class here. -->
     <application
-        android:name="io.flutter.app.FlutterApplication"
         android:label="ui3d"
         android:icon="@mipmap/ic_launcher">
         <activity
diff --git a/examples/ui_3d/android/build.gradle b/examples/ui_3d/android/build.gradle
index 3100ad2..618be9d 100644
--- a/examples/ui_3d/android/build.gradle
+++ b/examples/ui_3d/android/build.gradle
@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }
diff --git a/examples/ui_3d/android/gradle/wrapper/gradle-wrapper.properties b/examples/ui_3d/android/gradle/wrapper/gradle-wrapper.properties
index 296b146..cfe88f6 100644
--- a/examples/ui_3d/android/gradle/wrapper/gradle-wrapper.properties
+++ b/examples/ui_3d/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.1-all.zip
diff --git a/examples/ui_3d/lib/ui_3d.dart b/examples/ui_3d/lib/ui_3d.dart
index 9d0173f..7c3b7f7 100644
--- a/examples/ui_3d/lib/ui_3d.dart
+++ b/examples/ui_3d/lib/ui_3d.dart
@@ -20,7 +20,7 @@ class Ui3D extends StatefulWidget {
 }
 
 class _ZUiState extends State<Ui3D> with TickerProviderStateMixin {
-  AnimationController animationController;
+  AnimationController? animationController;
 
   @override
   void initState() {
@@ -29,14 +29,14 @@ class _ZUiState extends State<Ui3D> with TickerProviderStateMixin {
       vsync: this,
     );
     Future.delayed(Duration(seconds: 3),
-        () => {animationController.repeat(reverse: true)});
+        () => {animationController?.repeat(reverse: true)});
 
     super.initState();
   }
 
   @override
   void dispose() {
-    animationController.dispose();
+    animationController?.dispose();
 
     super.dispose();
   }
@@ -44,7 +44,7 @@ class _ZUiState extends State<Ui3D> with TickerProviderStateMixin {
   @override
   Widget build(BuildContext context) {
     final curve = CurvedAnimation(
-        parent: animationController, curve: Curves.easeInOutSine);
+        parent: animationController!, curve: Curves.easeInOutSine);
 
     final mediaQuery = MediaQuery.of(context);
     final height = mediaQuery.size.height;
@@ -53,7 +53,7 @@ class _ZUiState extends State<Ui3D> with TickerProviderStateMixin {
     return Material(
       color: Colors.black,
       child: AnimatedBuilder(
-        animation: animationController,
+        animation: animationController!,
         builder: (context, _) {
           final progress = 1 - curve.value;
           final appBarProgress =
@@ -138,7 +138,7 @@ class ZAppBar extends StatelessWidget {
             height: appBar,
             width: width,
             depth: depth,
-            color: Colors.blueAccent[400],
+            color: Colors.blueAccent[400]!,
           ),
         ),
         ZToBoxAdapter(
@@ -162,7 +162,7 @@ class ZFloatingButton extends StatelessWidget {
             child: ZCylinder(
               diameter: floatingButtonSize,
               length: depth,
-              color: Colors.blueAccent[400],
+              color: Colors.blueAccent[400]!,
             )),
         ZToBoxAdapter(
           height: floatingButtonSize,
@@ -179,9 +179,9 @@ class ZFloatingButton extends StatelessWidget {
 }
 
 class ZListTile extends StatelessWidget {
-  final int index;
+  final int? index;
 
-  const ZListTile({Key key, this.index}) : super(key: key);
+  const ZListTile({Key? key, this.index}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -194,7 +194,7 @@ class ZListTile extends StatelessWidget {
               depth: titleDepth / 2,
               height: tileHeight,
               width: width,
-              color: Colors.grey[100],
+              color: Colors.grey[100]!,
             )),
         ZToBoxAdapter(
           height: tileHeight,
diff --git a/examples/ui_3d/pubspec.lock b/examples/ui_3d/pubspec.lock
index c1dca3c..4c5ca7c 100644
--- a/examples/ui_3d/pubspec.lock
+++ b/examples/ui_3d/pubspec.lock
@@ -5,58 +5,58 @@ packages:
     dependency: transitive
     description:
       name: async
-      url: "https://pub.dartlang.org"
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.8.2"
+    version: "2.11.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
-      url: "https://pub.dartlang.org"
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   characters:
     dependency: transitive
     description:
       name: characters
-      url: "https://pub.dartlang.org"
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.1"
+    version: "1.3.0"
   clock:
     dependency: transitive
     description:
       name: clock
-      url: "https://pub.dartlang.org"
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   collection:
     dependency: transitive
     description:
       name: collection
-      url: "https://pub.dartlang.org"
+      sha256: f092b211a4319e98e5ff58223576de6c2803db36221657b46c82574721240687
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.15.0"
+    version: "1.17.2"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
-      url: "https://pub.dartlang.org"
+      sha256: e35129dc44c9118cee2a5603506d823bab99c68393879edb440e0090d07586be
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.1.3"
+    version: "1.0.5"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
-      url: "https://pub.dartlang.org"
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -71,30 +71,34 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      url: "https://pub.dartlang.org"
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.16"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.11"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      url: "https://pub.dartlang.org"
+      sha256: "3c74dbf8763d36539f114c799d8a2d87343b5067e9d796ca22b5eb8437090ee3"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.7.0"
+    version: "1.9.1"
   path:
     dependency: transitive
     description:
       name: path
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.0"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.5"
+    version: "1.8.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -104,64 +108,72 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      url: "https://pub.dartlang.org"
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.1"
+    version: "1.10.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
-      url: "https://pub.dartlang.org"
+      sha256: c3c7d8edb15bee7f0f74debd4b9c5f3c2ea86766fe4178eb2a18eb30a0bdaed5
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.10.0"
+    version: "1.11.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      url: "https://pub.dartlang.org"
+      sha256: "83615bee9045c1d322bbbd1ba209b7a749c2cbcdcb3fdd1df8eb488b3279c1c8"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0"
+    version: "2.1.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
-      url: "https://pub.dartlang.org"
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
-      url: "https://pub.dartlang.org"
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
-      url: "https://pub.dartlang.org"
+      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.4.3"
-  typed_data:
+    version: "0.6.0"
+  vector_math:
     dependency: transitive
     description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
+      name: vector_math
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0"
-  vector_math:
+    version: "2.1.4"
+  web:
     dependency: transitive
     description:
-      name: vector_math
-      url: "https://pub.dartlang.org"
+      name: web
+      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.1"
+    version: "0.1.4-beta"
   zflutter:
     dependency: "direct main"
     description:
       path: "../../zflutter"
       relative: true
     source: path
-    version: "0.0.1+2"
+    version: "0.0.1+3"
 sdks:
-  dart: ">=2.14.0 <3.0.0"
+  dart: ">=3.1.0-185.0.dev <4.0.0"
diff --git a/examples/ui_3d/pubspec.yaml b/examples/ui_3d/pubspec.yaml
index 5e0d1a6..b9e9496 100644
--- a/examples/ui_3d/pubspec.yaml
+++ b/examples/ui_3d/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -29,7 +29,7 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.3
+  cupertino_icons: ^1.0.4
 
 dev_dependencies:
   flutter_test:
diff --git a/zflutter/example/android/app/src/main/AndroidManifest.xml b/zflutter/example/android/app/src/main/AndroidManifest.xml
index 55ca830..bfb7b47 100644
--- a/zflutter/example/android/app/src/main/AndroidManifest.xml
+++ b/zflutter/example/android/app/src/main/AndroidManifest.xml
@@ -6,7 +6,6 @@
          additional functionality it is fine to subclass or reimplement
          FlutterApplication and put your custom class here. -->
     <application
-        android:name="io.flutter.app.FlutterApplication"
         android:label="example"
         android:icon="@mipmap/ic_launcher">
         <activity
diff --git a/zflutter/example/android/build.gradle b/zflutter/example/android/build.gradle
index 3100ad2..433270e 100644
--- a/zflutter/example/android/build.gradle
+++ b/zflutter/example/android/build.gradle
@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.5.31'
     repositories {
         google()
         jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.0.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/zflutter/example/android/gradle/wrapper/gradle-wrapper.properties b/zflutter/example/android/gradle/wrapper/gradle-wrapper.properties
index 296b146..493072b 100644
--- a/zflutter/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/zflutter/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
diff --git a/zflutter/example/ios/Runner/Info.plist b/zflutter/example/ios/Runner/Info.plist
index a060db6..1579fb3 100644
--- a/zflutter/example/ios/Runner/Info.plist
+++ b/zflutter/example/ios/Runner/Info.plist
@@ -41,5 +41,7 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
 </dict>
 </plist>
diff --git a/zflutter/example/lib/examples/device/cupertino_sheet.dart b/zflutter/example/lib/examples/device/cupertino_sheet.dart
index d69c722..44369ac 100644
--- a/zflutter/example/lib/examples/device/cupertino_sheet.dart
+++ b/zflutter/example/lib/examples/device/cupertino_sheet.dart
@@ -1,7 +1,5 @@
 import 'dart:ui';
 
-import 'package:flutter/rendering.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:slivers/slivers.dart';
diff --git a/zflutter/example/lib/examples/device/device.dart b/zflutter/example/lib/examples/device/device.dart
index e4cc8ec..53df4ce 100644
--- a/zflutter/example/lib/examples/device/device.dart
+++ b/zflutter/example/lib/examples/device/device.dart
@@ -296,8 +296,7 @@ class FrameThemeData {
   const FrameThemeData.raw({
     required this.frameColor,
     required this.statusBarBrightness,
-  })  : assert(frameColor != null),
-        assert(statusBarBrightness != null);
+  });
 
   Color get statusBarColor =>
       statusBarBrightness == Brightness.dark ? Colors.white : Colors.black;
diff --git a/zflutter/example/lib/examples/getting_started.dart b/zflutter/example/lib/examples/getting_started.dart
index 3f64b11..8e658b1 100644
--- a/zflutter/example/lib/examples/getting_started.dart
+++ b/zflutter/example/lib/examples/getting_started.dart
@@ -1,5 +1,3 @@
-import 'dart:math';
-
 import 'package:flutter/material.dart';
 import 'package:z_flutter_example/spin.dart';
 import 'package:zflutter/zflutter.dart';
diff --git a/zflutter/example/lib/examples/ink_well.dart b/zflutter/example/lib/examples/ink_well.dart
index 183280d..0fc19f6 100644
--- a/zflutter/example/lib/examples/ink_well.dart
+++ b/zflutter/example/lib/examples/ink_well.dart
@@ -1,4 +1,3 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:zflutter/zflutter.dart';
 import 'dart:math' as math;
diff --git a/zflutter/example/lib/examples/on_the_go.dart b/zflutter/example/lib/examples/on_the_go.dart
index b11e65f..f6647d4 100644
--- a/zflutter/example/lib/examples/on_the_go.dart
+++ b/zflutter/example/lib/examples/on_the_go.dart
@@ -1,9 +1,6 @@
-import 'dart:ui';
-
 import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:zflutter/zflutter.dart';
 
 const illoSize = 128;
diff --git a/zflutter/example/lib/examples/z_fighting.dart b/zflutter/example/lib/examples/z_fighting.dart
index 5ade8e3..73e7d7f 100644
--- a/zflutter/example/lib/examples/z_fighting.dart
+++ b/zflutter/example/lib/examples/z_fighting.dart
@@ -1,4 +1,3 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:zflutter/zflutter.dart';
 
diff --git a/zflutter/example/lib/main.dart b/zflutter/example/lib/main.dart
index 7ff651c..cca8fbc 100644
--- a/zflutter/example/lib/main.dart
+++ b/zflutter/example/lib/main.dart
@@ -1,6 +1,4 @@
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
-import 'package:zflutter/zflutter.dart';
 
 import 'examples/examples.dart';
 import 'examples/getting_started.dart';
diff --git a/zflutter/example/pubspec.lock b/zflutter/example/pubspec.lock
index a3b20f1..c6c2b9b 100644
--- a/zflutter/example/pubspec.lock
+++ b/zflutter/example/pubspec.lock
@@ -42,21 +42,21 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.16.0"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.4"
+    version: "1.0.5"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -80,7 +80,7 @@ packages:
       name: material_color_utilities
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "0.1.4"
   meta:
     dependency: transitive
     description:
@@ -94,14 +94,14 @@ packages:
       name: modal_bottom_sheet
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -120,7 +120,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.1"
+    version: "1.8.2"
   stack_trace:
     dependency: transitive
     description:
@@ -155,21 +155,14 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.8"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.0"
+    version: "0.4.9"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
   zflutter:
     dependency: "direct main"
     description:
@@ -178,5 +171,5 @@ packages:
     source: path
     version: "0.0.1+3"
 sdks:
-  dart: ">=2.14.0 <3.0.0"
-  flutter: ">=1.17.0"
+  dart: ">=2.17.0 <3.0.0"
+  flutter: ">=3.0.0"
diff --git a/zflutter/lib/src/core/renderer.dart b/zflutter/lib/src/core/renderer.dart
index 9989ab8..9de3436 100644
--- a/zflutter/lib/src/core/renderer.dart
+++ b/zflutter/lib/src/core/renderer.dart
@@ -1,7 +1,6 @@
 //@dart=2.12
 import 'package:flutter/material.dart';
 import 'package:zflutter/src/core/core.dart';
-import 'package:vector_math/vector_math_64.dart' as vector;
 
 class ZRenderer {
   Paint paint = Paint()
diff --git a/zflutter/lib/src/core/widgets/positioned.dart b/zflutter/lib/src/core/widgets/positioned.dart
index d54e188..9f8da7c 100644
--- a/zflutter/lib/src/core/widgets/positioned.dart
+++ b/zflutter/lib/src/core/widgets/positioned.dart
@@ -123,7 +123,7 @@ class ZPositioned extends ZUpdateParentDataWidget<ZParentData> with ZWidget {
 
     if (needsLayout) {
       renderObject.markNeedsLayout();
-      AbstractNode? targetParent = renderObject.parent;
+      RenderObject? targetParent = renderObject.parent;
 
       while (targetParent is RenderZBox) {
         targetParent.markNeedsLayout();
@@ -156,7 +156,7 @@ class ZPositioned extends ZUpdateParentDataWidget<ZParentData> with ZWidget {
       }
     }
 
-    final AbstractNode? targetParent = renderObject.parent;
+    final RenderObject? targetParent = renderObject.parent;
     if (targetParent is RenderObject) targetParent.markNeedsLayout();
   }
 
diff --git a/zflutter/lib/src/core/widgets/shape.dart b/zflutter/lib/src/core/widgets/shape.dart
index b6d5a79..7c94b25 100644
--- a/zflutter/lib/src/core/widgets/shape.dart
+++ b/zflutter/lib/src/core/widgets/shape.dart
@@ -3,8 +3,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:zflutter/zflutter.dart';
 
-import '../core.dart';
-
 /// A zWidget that paints a shape in a 3D space.
 ///
 /// zWidget are special-purpose widgets that can be combined using a
diff --git a/zflutter/lib/src/widgets/figures/cone.dart b/zflutter/lib/src/widgets/figures/cone.dart
index 6e4153c..b1b18ab 100644
--- a/zflutter/lib/src/widgets/figures/cone.dart
+++ b/zflutter/lib/src/widgets/figures/cone.dart
@@ -16,8 +16,7 @@ class ZCone extends ZCircle {
     double stroke = 1,
     bool fill = true,
     ZVector front = const ZVector.only(z: 1),
-  })  : assert(diameter != null),
-        super(
+  })  : super(
             key: key,
             color: color,
             backfaceColor: backfaceColor,
@@ -91,9 +90,7 @@ class RenderZCone extends RenderZShape {
     bool fill = false,
     double stroke = 1,
     PathBuilder pathBuilder = PathBuilder.empty,
-  })  : assert(length != null),
-        assert(diameter != null),
-        _length = length,
+  })  : _length = length,
         _diameter = diameter,
         super(
           color: color,
diff --git a/zflutter/lib/src/widgets/figures/hemisphere.dart b/zflutter/lib/src/widgets/figures/hemisphere.dart
index 0a902dd..f09e606 100644
--- a/zflutter/lib/src/widgets/figures/hemisphere.dart
+++ b/zflutter/lib/src/widgets/figures/hemisphere.dart
@@ -1,9 +1,6 @@
-import 'dart:ui';
-
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 
-import 'package:zflutter/src/widgets/group.dart';
 import 'package:zflutter/zflutter.dart';
 import 'dart:math' as math;
 
diff --git a/zflutter/pubspec.lock b/zflutter/pubspec.lock
index ba4781c..c516655 100644
--- a/zflutter/pubspec.lock
+++ b/zflutter/pubspec.lock
@@ -49,7 +49,7 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.16.0"
   equatable:
     dependency: transitive
     description:
@@ -63,7 +63,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.3.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -87,7 +87,7 @@ packages:
       name: material_color_utilities
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.3"
+    version: "0.1.4"
   meta:
     dependency: transitive
     description:
@@ -101,7 +101,7 @@ packages:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -113,7 +113,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.1"
+    version: "1.8.2"
   stack_trace:
     dependency: transitive
     description:
@@ -148,21 +148,14 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.8"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.3.0"
+    version: "0.4.9"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.2"
 sdks:
-  dart: ">=2.15.0 <3.0.0"
+  dart: ">=2.17.0-0 <3.0.0"
   flutter: ">=2.8.1"