diff --git a/lib/src/color_patterns.dart b/lib/src/color_patterns.dart
index 0049d15..e320440 100644
--- a/lib/src/color_patterns.dart
+++ b/lib/src/color_patterns.dart
@@ -8,9 +8,9 @@ import 'linear_gradient_style.dart';
 
 class ColorPatterns {
   List<Color> getColorCombination(int gradientType) {
-    List<Color> colorList = new List();
+    List<Color> colorList = [];
 
-    if (colorList != null) {
+    if (colorList.isNotEmpty) {
       colorList.clear();
     }
     switch (gradientType) {
diff --git a/lib/src/linear_gradient_style.dart b/lib/src/linear_gradient_style.dart
index 522225a..26a18bc 100644
--- a/lib/src/linear_gradient_style.dart
+++ b/lib/src/linear_gradient_style.dart
@@ -343,7 +343,9 @@ class LinearGradientStyle {
 
   /// [getColorCombination()] which get color Combination based on Gradient Type Selection
   /// [OrientationType()] It will set Gradient offset Horizontal and Vertical based on Selection.
-  static LinearGradient linearGradient({int orientation, int gradientType}) {
+  static LinearGradient linearGradient(
+      {int orientation = LinearGradientStyle.ORIENTATION_HORIZONTAL,
+      int gradientType = LinearGradientStyle.GRADIENT_TYPE_ROYAL}) {
     LinearGradient linearGradient;
     if (orientation == 0) {
       linearGradient = LinearGradient(
@@ -377,7 +379,7 @@ class LinearGradientStyle {
     return linearGradient;
   }
 
-  static List<Color> getColorCombination({int gradientType}) {
+  static List<Color> getColorCombination({required int gradientType}) {
     return ColorPatterns().getColorCombination(gradientType);
   }
 }
diff --git a/pubspec.lock b/pubspec.lock
index 67a7df1..03307d6 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: "2.0.11"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.0"
+    version: "2.8.2"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
-  collection:
+    version: "1.3.1"
+  clock:
     dependency: transitive
     description:
-      name: collection
+      name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.11"
-  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: "2.1.3"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -67,55 +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: "2.1.4"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.6"
+    version: "0.12.11"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.8"
+    version: "1.7.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.0+1"
-  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: "2.0.5"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -127,62 +92,55 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.5"
+    version: "1.8.1"
   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: "0.2.11"
+    version: "0.4.3"
   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: "3.5.0"
+    version: "2.1.1"
 sdks:
-  dart: ">=2.4.0 <3.0.0"
+  dart: ">=2.14.0 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 62220c5..865f117 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,7 @@ author: Techno Prashant <prashant09mca@gmail.com>
 homepage: https://github.com/Prashant09mca/flutter_linear_gradient
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
@@ -15,39 +15,4 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter.
 flutter:
-
-# To add assets to your package, add an assets section, like this:
-# assets:
-#  - images/a_dot_burr.jpeg
-#  - images/a_dot_ham.jpeg
-#
-# For details regarding assets in packages, see
-# https://flutter.dev/assets-and-images/#from-packages
-#
-# An image asset can refer to one or more resolution-specific "variants", see
-# https://flutter.dev/assets-and-images/#resolution-aware.
-
-# To add custom fonts to your package, add a fonts section here,
-# in this "flutter" section. Each entry in this list should have a
-# "family" key with the font family name, and a "fonts" key with a
-# list giving the asset and other descriptors for the font. For
-# example:
-# fonts:
-#   - family: Schyler
-#     fonts:
-#       - asset: fonts/Schyler-Regular.ttf
-#       - asset: fonts/Schyler-Italic.ttf
-#         style: italic
-#   - family: Trajan Pro
-#     fonts:
-#       - asset: fonts/TrajanPro.ttf
-#       - asset: fonts/TrajanPro_Bold.ttf
-#         weight: 700
-#
-# For details regarding fonts in packages, see
-# https://flutter.dev/custom-fonts/#from-packages