diff --git a/example/ios/Flutter/Debug.xcconfig b/example/ios/Flutter/Debug.xcconfig
index 592ceee..ec97fc6 100644
--- a/example/ios/Flutter/Debug.xcconfig
+++ b/example/ios/Flutter/Debug.xcconfig
@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"
diff --git a/example/ios/Flutter/Release.xcconfig b/example/ios/Flutter/Release.xcconfig
index 592ceee..c4855bf 100644
--- a/example/ios/Flutter/Release.xcconfig
+++ b/example/ios/Flutter/Release.xcconfig
@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"
diff --git a/example/ios/Podfile b/example/ios/Podfile
new file mode 100644
index 0000000..1e8c3c9
--- /dev/null
+++ b/example/ios/Podfile
@@ -0,0 +1,41 @@
+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end
diff --git a/example/pubspec.lock b/example/pubspec.lock
index c7e48f8..7fcba93 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -1,55 +1,55 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.13"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.0"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.1"
+    version: "2.5.0"
   blobs:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "1.2.0"
+    version: "2.0.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.3"
+    version: "1.2.0"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.12"
+    version: "1.15.0"
   convert:
     dependency: transitive
     description:
@@ -71,6 +71,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.1.3"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -102,34 +109,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.1.4"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.12"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.6"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
+    version: "1.8.0"
   path_provider:
     dependency: transitive
     description:
@@ -158,13 +158,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.9.0"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
   platform:
     dependency: transitive
     description:
@@ -179,13 +172,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.2"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -197,63 +183,56 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.15"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.6.1"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.7.0 <3.0.0"
-  flutter: ">=1.17.0 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=1.17.0"
diff --git a/lib/src/clipper/clipper.dart b/lib/src/clipper/clipper.dart
index 81c184a..abf915c 100644
--- a/lib/src/clipper/clipper.dart
+++ b/lib/src/clipper/clipper.dart
@@ -4,7 +4,7 @@ import 'package:blobs/src/services/blob_generator.dart';
 import 'package:flutter/material.dart';
 
 class BlobClipper extends CustomClipper<Path> {
-  final String id;
+  final String? id;
   final int edgesCount;
   final int minGrowth;
   BlobClipper({
diff --git a/lib/src/config.dart b/lib/src/config.dart
index 2f9f98c..b4cdc06 100644
--- a/lib/src/config.dart
+++ b/lib/src/config.dart
@@ -4,8 +4,8 @@ import 'package:flutter/material.dart';
 class BlobConfig {
   static const Color color = Color(0xff3c40c6);
   static const BlobFillType fillType = BlobFillType.fill;
-  static const num edgesCount = 6;
-  static const num minGrowth = 6;
-  static const num animDurationMs = 500;
+  static const int edgesCount = 6;
+  static const int minGrowth = 6;
+  static const int animDurationMs = 500;
   static const int strokeWidth = 3;
 }
diff --git a/lib/src/models.dart b/lib/src/models.dart
index 4babb5e..2096294 100644
--- a/lib/src/models.dart
+++ b/lib/src/models.dart
@@ -1,3 +1,4 @@
+import 'package:blobs/src/config.dart';
 import 'package:flutter/material.dart';
 
 class BlobData {
@@ -5,20 +6,20 @@ class BlobData {
   num size;
   int edges;
   BlobPoints points;
-  String id;
+  String? id;
   Path path;
-  String svgPath;
+  String? svgPath;
   BlobCurves curves;
 
   BlobData({
-    this.growth,
-    this.size,
-    this.edges,
-    this.points,
-    this.id,
-    this.path,
-    this.svgPath,
-    this.curves,
+    required this.growth,
+    required this.size,
+    required this.edges,
+    required this.points,
+    required this.id,
+    required this.path,
+    required this.svgPath,
+    required this.curves,
   });
 }
 
@@ -33,14 +34,14 @@ enum BlobFillType { fill, stroke }
 
 class BlobStyles {
   Color color;
-  Shader gradient;
+  Shader? gradient;
   int strokeWidth;
   BlobFillType fillType;
   BlobStyles({
-    this.color,
+    this.color = BlobConfig.color,
     this.gradient,
-    this.fillType,
-    this.strokeWidth,
+    this.fillType = BlobConfig.fillType,
+    this.strokeWidth = BlobConfig.strokeWidth,
   });
 }
 
@@ -49,12 +50,12 @@ class BlobPoints {
   List<Offset> destPoints;
   Offset center;
   double innerRad;
-  String id;
+  String? id;
   BlobPoints({
-    this.originPoints,
-    this.destPoints,
-    this.center,
-    this.id,
-    this.innerRad,
+    required this.originPoints,
+    required this.destPoints,
+    required this.center,
+    required this.id,
+    required this.innerRad,
   });
 }
diff --git a/lib/src/painter/painter.dart b/lib/src/painter/painter.dart
index 88930d6..1d0bfd1 100644
--- a/lib/src/painter/painter.dart
+++ b/lib/src/painter/painter.dart
@@ -3,25 +3,25 @@ import 'package:blobs/src/painter/tools.dart';
 import 'package:flutter/material.dart';
 
 class BlobPainter extends CustomPainter {
-  final BlobData blobData;
+  final BlobData? blobData;
   final bool debug;
   final BlobStyles styles;
 
   BlobPainter({
     this.blobData,
-    this.styles,
+    required this.styles,
     this.debug = false,
   });
 
   @override
   void paint(Canvas c, Size s) {
-    drawBlob(c, blobData.path, styles);
+    drawBlob(c, blobData!.path, styles);
     if (debug) {
       circle(c, s, (s.width / 2)); // outer circle
-      circle(c, s, blobData.points.innerRad); // inner circle
+      circle(c, s, blobData!.points.innerRad); // inner circle
       point(c, Offset(s.width / 2, s.height / 2)); // center point
-      List originPoints = blobData.points.originPoints;
-      List destPoints = blobData.points.destPoints;
+      List originPoints = blobData!.points.originPoints;
+      List destPoints = blobData!.points.destPoints;
       originPoints.asMap().forEach(
             (i, p) => drawLines(c, p, destPoints[i]),
           ); // line from  inner  circle to blob point
diff --git a/lib/src/painter/tools.dart b/lib/src/painter/tools.dart
index 22ce016..4dd040d 100644
--- a/lib/src/painter/tools.dart
+++ b/lib/src/painter/tools.dart
@@ -1,4 +1,3 @@
-import 'package:blobs/src/config.dart';
 import 'package:blobs/src/models.dart';
 import 'package:flutter/material.dart';
 
@@ -11,7 +10,7 @@ circle(Canvas canvas, Size size, num radius) {
   var path = Path();
   path.addOval(Rect.fromCircle(
     center: Offset(size.width / 2, size.height / 2),
-    radius: radius,
+    radius: radius as double,
   ));
   canvas.drawPath(path, paint);
 }
@@ -60,13 +59,13 @@ Paint createPaint(BlobStyles styles) {
     BlobFillType.fill: PaintingStyle.fill,
     BlobFillType.stroke: PaintingStyle.stroke
   };
-  if (styles == null) styles = BlobStyles();
+  // if (styles == null) styles = BlobStyles();
 
   var paint = Paint();
-  paint.color = styles.color ?? BlobConfig.color;
+  paint.color = styles.color;
   paint.shader = styles.gradient;
-  paint.strokeWidth = (styles.strokeWidth ?? BlobConfig.strokeWidth).toDouble();
-  paint.style = fillType[styles.fillType ?? BlobConfig.fillType];
+  paint.strokeWidth = (styles.strokeWidth).toDouble();
+  paint.style = fillType[styles.fillType]!;
 
   return paint;
 }
diff --git a/lib/src/services/blob_animator.dart b/lib/src/services/blob_animator.dart
index c748ed9..e3a1257 100644
--- a/lib/src/services/blob_animator.dart
+++ b/lib/src/services/blob_animator.dart
@@ -6,7 +6,7 @@ class BlobAnimator {
   List<List<Tween>> tweens = [];
   List<List<Animation>> anims = [];
 
-  BlobAnimator({this.pathPoints, this.animationController});
+  BlobAnimator({required this.pathPoints, required this.animationController});
 
   init(Function(List<Offset>) callback) {
     Animation<double> animation = CurvedAnimation(
diff --git a/lib/src/services/blob_controller.dart b/lib/src/services/blob_controller.dart
index 80d4611..07bbd5e 100644
--- a/lib/src/services/blob_controller.dart
+++ b/lib/src/services/blob_controller.dart
@@ -1,16 +1,13 @@
 import 'package:blobs/src/models.dart';
 
 class BlobController {
-  BlobData Function() _listener;
+  BlobData? Function()? _listener;
   BlobController();
-  onChange(BlobData Function() ex) {
+  onChange(BlobData? Function() ex) {
     _listener = ex;
   }
 
-  BlobData change() {
-    if (_listener == null) return BlobData();
-    return _listener();
-  }
+  BlobData? change() => _listener != null ? _listener!() : null;
 
   dispose() {
     _listener = null;
diff --git a/lib/src/services/blob_error_handler.dart b/lib/src/services/blob_error_handler.dart
index 694e258..f548204 100644
--- a/lib/src/services/blob_error_handler.dart
+++ b/lib/src/services/blob_error_handler.dart
@@ -1,5 +1,5 @@
 class InvalidIDException implements Exception {
-  final String id;
+  final String? id;
 
   InvalidIDException(this.id);
   @override
diff --git a/lib/src/services/blob_generator.dart b/lib/src/services/blob_generator.dart
index 4791f2e..85f364d 100644
--- a/lib/src/services/blob_generator.dart
+++ b/lib/src/services/blob_generator.dart
@@ -6,11 +6,11 @@ import 'package:flutter/material.dart';
 import 'package:blobs/src/models.dart';
 
 class BlobGenerator {
-  final Size size;
-  int edgesCount;
-  int minGrowth;
+  final Size? size;
+  int? edgesCount;
+  int? minGrowth;
   String svgPath = '';
-  String id;
+  String? id;
   List<List<Offset>> dots = [];
 
   BlobGenerator({
@@ -22,23 +22,23 @@ class BlobGenerator {
 
   BlobData generate() {
     if (id != null) {
-      var datum = id.split('-');
+      var datum = id!.split('-');
       if (datum.length != 3) throw InvalidIDException(id);
       edgesCount = int.parse(datum[0]);
       minGrowth = int.parse(datum[1]);
       id = datum[2];
     }
-    if (edgesCount <= 2) throw InvalidEdgesCountException();
-    var points = _createPoints(id != null ? int.parse(id) : null);
+    if (edgesCount! <= 2) throw InvalidEdgesCountException();
+    var points = _createPoints(id != null ? int.parse(id!) : null);
     BlobCurves curves = _createCurves(points.destPoints);
     Path path = connectPoints(curves);
     return BlobData(
-      edges: edgesCount,
-      growth: minGrowth,
+      edges: edgesCount!,
+      growth: minGrowth!,
       id: points.id,
       path: path,
       points: points,
-      size: size.width,
+      size: size!.width,
       svgPath: svgPath,
       curves: curves,
     );
@@ -64,7 +64,7 @@ class BlobGenerator {
 
   List<double> _divide(num count) {
     double deg = 360 / count;
-    return List.generate(count, (i) => i * deg).toList();
+    return List.generate(count as int, (i) => i * deg).toList();
   }
 
   //  https://stackoverflow.com/a/29450606/3096740
@@ -79,7 +79,7 @@ class BlobGenerator {
 
       num result = (((mz << 16) + (mw & 65535)) & mask) >> 0;
       result /= 4294967296;
-      return result;
+      return result as double;
     };
   }
 
@@ -99,15 +99,15 @@ class BlobGenerator {
     return Offset(x.round().toDouble(), y.round().toDouble());
   }
 
-  BlobPoints _createPoints(int seedValue) {
-    num outerRad = size.width / 2;
-    num innerRad = minGrowth * (outerRad / 10);
-    Offset center = Offset(size.width / 2, size.height / 2);
+  BlobPoints _createPoints(int? seedValue) {
+    num outerRad = size!.width / 2;
+    num innerRad = minGrowth! * (outerRad / 10);
+    Offset center = Offset(size!.width / 2, size!.height / 2);
 
-    List<double> slices = _divide(edgesCount);
-    int randomInt;
+    List<double> slices = _divide(edgesCount!);
+    int? randomInt;
     if (id != null) {
-      seedValue = int.parse(id);
+      seedValue = int.parse(id!);
     } else {
       int maxRandomValue = ([99, 999, 9999, 99999, 999999]..shuffle()).first;
       randomInt = Random().nextInt(maxRandomValue);
@@ -119,7 +119,7 @@ class BlobGenerator {
 
     slices.forEach((degree) {
       double O = _magicPoint(randVal(), innerRad, outerRad);
-      Offset start = _point(center, innerRad, degree);
+      Offset start = _point(center, innerRad as double, degree);
       Offset end = _point(center, O, degree);
       originPoints.add(start);
       destPoints.add(end);
@@ -134,16 +134,16 @@ class BlobGenerator {
   }
 
   BlobPoints _createPointsFromDest(List<Offset> destPoints) {
-    num outerRad = size.width / 2;
-    num innerRad = minGrowth * (outerRad / 10);
-    Offset center = Offset(size.width / 2, size.height / 2);
+    num outerRad = size!.width / 2;
+    num innerRad = minGrowth! * (outerRad / 10);
+    Offset center = Offset(size!.width / 2, size!.height / 2);
 
-    List<double> slices = _divide(edgesCount);
+    List<double> slices = _divide(edgesCount!);
 
     List<Offset> originPoints = [];
 
     slices.forEach((degree) {
-      Offset start = _point(center, innerRad, degree);
+      Offset start = _point(center, innerRad as double, degree);
       originPoints.add(start);
     });
     return BlobPoints(
diff --git a/lib/src/widgets/animated_blob.dart b/lib/src/widgets/animated_blob.dart
index 8f51ac8..a2046e7 100644
--- a/lib/src/widgets/animated_blob.dart
+++ b/lib/src/widgets/animated_blob.dart
@@ -9,8 +9,8 @@ class AnimatedBlob extends StatefulWidget {
   final double size;
   final bool debug;
   final BlobStyles styles;
-  final String id;
-  final BlobController ctrl;
+  final String? id;
+  // final BlobController/*!*/ ctrl;
   final Widget child;
   final Duration duration;
   final BlobData fromBlobData;
@@ -18,14 +18,14 @@ class AnimatedBlob extends StatefulWidget {
 
   const AnimatedBlob({
     this.size = 200,
-    this.fromBlobData,
-    this.toBlobData,
+    required this.fromBlobData,
+    required this.toBlobData,
     this.debug = false,
-    this.styles,
-    this.ctrl,
+    required this.styles,
+    // this.ctrl,
     this.id,
-    this.duration,
-    this.child,
+    required this.duration,
+    required this.child,
   });
 
   @override
@@ -34,9 +34,9 @@ class AnimatedBlob extends StatefulWidget {
 
 class _AnimatedBlobState extends State<AnimatedBlob>
     with SingleTickerProviderStateMixin {
-  AnimationController _animationController;
-  BlobAnimator animator;
-  BlobData data;
+  late final AnimationController _animationController;
+  late BlobAnimator animator;
+  late BlobData data;
 
   @override
   void didUpdateWidget(AnimatedBlob oldWidget) {
@@ -81,7 +81,7 @@ class _AnimatedBlobState extends State<AnimatedBlob>
 
   @override
   void dispose() {
-    if (widget.ctrl != null) widget.ctrl.dispose();
+    // if (widget.ctrl != null) widget.ctrl.dispose();
     _animationController.dispose();
     super.dispose();
   }
diff --git a/lib/src/widgets/blob.dart b/lib/src/widgets/blob.dart
index 9b831ac..2f00711 100644
--- a/lib/src/widgets/blob.dart
+++ b/lib/src/widgets/blob.dart
@@ -11,20 +11,20 @@ import 'package:flutter/material.dart';
 class Blob extends StatefulWidget {
   final double size;
   final bool debug;
-  final BlobStyles styles;
-  final BlobController controller;
-  final Widget child;
-  final int edgesCount;
-  final int minGrowth;
-  final List<String> id;
-  final Duration duration;
+  final BlobStyles? styles;
+  final BlobController? controller;
+  final Widget? child;
+  final int? edgesCount;
+  final int? minGrowth;
+  final List<String>? id;
+  final Duration? duration;
   final bool loop;
   final bool isAnimated;
 
   static int count = 0;
 
   Blob.random({
-    @required this.size,
+    required this.size,
     this.edgesCount = BlobConfig.edgesCount,
     this.minGrowth = BlobConfig.minGrowth,
     this.debug = false,
@@ -36,7 +36,7 @@ class Blob extends StatefulWidget {
         duration = null,
         isAnimated = false;
   Blob.animatedRandom({
-    @required this.size,
+    required this.size,
     this.edgesCount = BlobConfig.edgesCount,
     this.minGrowth = BlobConfig.minGrowth,
     this.debug = false,
@@ -51,8 +51,8 @@ class Blob extends StatefulWidget {
         id = null;
 
   Blob.fromID({
-    @required this.id,
-    @required this.size,
+    required this.id,
+    required this.size,
     this.debug = false,
     this.styles,
     this.controller,
@@ -64,8 +64,8 @@ class Blob extends StatefulWidget {
         isAnimated = false;
 
   Blob.animatedFromID({
-    @required this.id,
-    @required this.size,
+    required this.id,
+    required this.size,
     this.debug = false,
     this.styles,
     this.duration = const Duration(
@@ -82,7 +82,7 @@ class Blob extends StatefulWidget {
   _BlobState createState() => _BlobState();
 
   BlobData _randomBlobData() {
-    String randomID = (id == null || id.isEmpty) ? null : _randomID();
+    String? randomID = (id == null || id!.isEmpty) ? null : _randomID();
     return BlobGenerator(
       edgesCount: edgesCount,
       minGrowth: minGrowth,
@@ -93,15 +93,15 @@ class Blob extends StatefulWidget {
 
   String _randomID() {
     Blob.count++;
-    if (id.length == 1) return id[0];
-    return id[Blob.count % id.length];
+    if (id!.length == 1) return id![0];
+    return id![Blob.count % id!.length];
   }
 }
 
 class _BlobState extends State<Blob> {
-  BlobData blobData;
-  BlobData fromBlobData;
-  Timer timer;
+  BlobData? blobData;
+  BlobData? fromBlobData;
+  Timer? timer;
 
   @override
   void initState() {
@@ -109,11 +109,11 @@ class _BlobState extends State<Blob> {
     _updateBlob();
     if (widget.loop) {
       timer = Timer.periodic(
-        Duration(milliseconds: widget.duration.inMilliseconds),
+        Duration(milliseconds: widget.duration!.inMilliseconds),
         (_) => _updateBlob(),
       );
     } else if (widget.controller != null) {
-      widget.controller.onChange(_updateBlob);
+      widget.controller!.onChange(_updateBlob);
     }
   }
 
@@ -121,25 +121,25 @@ class _BlobState extends State<Blob> {
   Widget build(BuildContext context) {
     if (!widget.isAnimated) {
       return SimpleBlob(
-        blobData: blobData,
+        blobData: blobData!,
         size: widget.size,
-        styles: widget.styles,
+        styles: widget.styles!,
         debug: widget.debug,
-        child: widget.child,
+        child: widget.child!,
       );
     }
     return AnimatedBlob(
-      fromBlobData: fromBlobData,
-      toBlobData: blobData,
+      fromBlobData: fromBlobData!,
+      toBlobData: blobData!,
       size: widget.size,
-      styles: widget.styles,
+      styles: widget.styles!,
       debug: widget.debug,
-      duration: widget.duration,
-      child: widget.child,
+      duration: widget.duration!,
+      child: widget.child!,
     );
   }
 
-  BlobData _updateBlob() {
+  BlobData? _updateBlob() {
     if (widget.isAnimated) {
       fromBlobData = blobData;
     }
@@ -150,8 +150,8 @@ class _BlobState extends State<Blob> {
 
   @override
   void dispose() {
-    if (timer != null) timer.cancel();
-    if (widget.controller != null) widget.controller.dispose();
+    if (timer != null) timer!.cancel();
+    if (widget.controller != null) widget.controller!.dispose();
     super.dispose();
   }
 }
diff --git a/lib/src/widgets/simple_blob.dart b/lib/src/widgets/simple_blob.dart
index 7d37024..3554a22 100644
--- a/lib/src/widgets/simple_blob.dart
+++ b/lib/src/widgets/simple_blob.dart
@@ -11,11 +11,11 @@ class SimpleBlob extends StatelessWidget {
   final BlobStyles styles;
 
   const SimpleBlob({
-    this.blobData,
-    this.size,
-    this.debug,
-    this.styles,
-    this.child,
+    required this.blobData,
+    required this.size,
+    required this.debug,
+    required this.styles,
+    required this.child,
   });
 
   @override
diff --git a/pubspec.lock b/pubspec.lock
index b40eda5..1023d04 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1,62 +1,55 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.13"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.0"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.1"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.3"
-  collection:
+    version: "1.2.0"
+  clock:
     dependency: transitive
     description:
-      name: collection
+      name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.12"
-  convert:
+    version: "1.1.0"
+  collection:
     dependency: transitive
     description:
-      name: convert
+      name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
-  crypto:
+    version: "1.15.0"
+  fake_async:
     dependency: transitive
     description:
-      name: crypto
+      name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.4"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -67,34 +60,27 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.12"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.6"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
+    version: "1.8.0"
   pedantic:
     dependency: "direct dev"
     description:
@@ -102,20 +88,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.9.0"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -127,63 +99,56 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.15"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.6.1"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.7.0 <3.0.0"
-  flutter: ">=0.2.5 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=0.2.5"
diff --git a/pubspec.yaml b/pubspec.yaml
index 668bd2f..fa42268 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,10 +1,10 @@
 name: blobs
 description: Create beautiful blobs - fixed/random blob generation, animations, svgs and more
-version: 1.2.0
+version: 2.0.0
 homepage: https://github.com/lokesh-coder/flutter_blobs
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
   flutter: ">=0.2.5 <2.0.0"
 
 dependencies: