diff --git a/example/.gitignore b/example/.gitignore
index b142d3f..9394988 100644
--- a/example/.gitignore
+++ b/example/.gitignore
@@ -67,3 +67,4 @@
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
 !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
+.flutter-plugins-dependencies
diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
index 6e40137..08e7c32 100644
--- a/example/android/app/build.gradle
+++ b/example/android/app/build.gradle
@@ -26,7 +26,7 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 31
 
     lintOptions {
         disable 'InvalidPackage'
@@ -36,7 +36,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.github.leisim.example"
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 31
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml
index 9ce586c..8ceca13 100644
--- a/example/android/app/src/main/AndroidManifest.xml
+++ b/example/android/app/src/main/AndroidManifest.xml
@@ -1,11 +1,12 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.leisim.example">
+    <uses-permission android:name="android.permission.INTERNET"/>
     <application
         android:name="io.flutter.app.FlutterApplication"
         android:label="example"
         android:icon="@drawable/ic_launcher">
         <activity
-            android:name=".MainActivity"
+            android:name="io.flutter.embedding.android.FlutterActivity"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
diff --git a/example/pubspec.yaml b/example/pubspec.yaml
index 5277b01..803e1a3 100644
--- a/example/pubspec.yaml
+++ b/example/pubspec.yaml
@@ -3,7 +3,7 @@ description: Demonstrates how to use the logger_flutter plugin.
 publish_to: 'none'
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
diff --git a/lib/src/ansi_parser.dart b/lib/src/ansi_parser.dart
index cf02642..66fe606 100644
--- a/lib/src/ansi_parser.dart
+++ b/lib/src/ansi_parser.dart
@@ -7,17 +7,17 @@ class AnsiParser {
 
   AnsiParser(this.dark);
 
-  Color foreground;
-  Color background;
-  List<TextSpan> spans;
+  Color? foreground;
+  Color? background;
+  List<TextSpan>? spans;
 
   void parse(String s) {
     spans = [];
     var state = TEXT;
-    StringBuffer buffer;
+    StringBuffer? buffer;
     var text = StringBuffer();
     var code = 0;
-    List<int> codes;
+    late List<int> codes;
 
     for (var i = 0, n = s.length; i < n; i++) {
       var c = s[i];
@@ -35,7 +35,7 @@ class AnsiParser {
           break;
 
         case BRACKET:
-          buffer.write(c);
+          buffer!.write(c);
           if (c == '[') {
             state = CODE;
           } else {
@@ -45,7 +45,7 @@ class AnsiParser {
           break;
 
         case CODE:
-          buffer.write(c);
+          buffer!.write(c);
           var codeUnit = c.codeUnitAt(0);
           if (codeUnit >= 48 && codeUnit <= 57) {
             code = code * 10 + codeUnit - 48;
@@ -56,7 +56,7 @@ class AnsiParser {
             continue;
           } else {
             if (text.isNotEmpty) {
-              spans.add(createSpan(text.toString()));
+              spans!.add(createSpan(text.toString()));
               text.clear();
             }
             state = TEXT;
@@ -72,7 +72,7 @@ class AnsiParser {
       }
     }
 
-    spans.add(createSpan(text.toString()));
+    spans!.add(createSpan(text.toString()));
   }
 
   void handleCodes(List<int> codes) {
@@ -99,7 +99,7 @@ class AnsiParser {
     }
   }
 
-  Color getColor(int colorCode, bool foreground) {
+  Color? getColor(int colorCode, bool foreground) {
     switch (colorCode) {
       case 12:
         return dark ? Colors.lightBlue[300] : Colors.indigo[700];
diff --git a/lib/src/log_console.dart b/lib/src/log_console.dart
index e7042bd..11e4bb7 100644
--- a/lib/src/log_console.dart
+++ b/lib/src/log_console.dart
@@ -8,7 +8,7 @@ class LogConsole extends StatefulWidget {
 
   LogConsole({this.dark = false, this.showCloseButton = false});
 
-  static Future<void> open(BuildContext context, {bool dark}) async {
+  static Future<void> open(BuildContext context, {bool? dark}) async {
     var logConsole = LogConsole(
       showCloseButton: true,
       dark: dark ?? Theme.of(context).brightness == Brightness.dark,
@@ -24,7 +24,7 @@ class LogConsole extends StatefulWidget {
   }
 
   static void add(OutputEvent outputEvent, {int bufferSize = 20}) {
-    while (_outputEventBuffer.length >= (bufferSize ?? 1)) {
+    while (_outputEventBuffer.length >= (bufferSize)) {
       _outputEventBuffer.removeFirst();
     }
     _outputEventBuffer.add(outputEvent);
@@ -50,7 +50,7 @@ class _LogConsoleState extends State<LogConsole> {
   var _scrollController = ScrollController();
   var _filterController = TextEditingController();
 
-  Level _filterLevel = Level.verbose;
+  Level? _filterLevel = Level.verbose;
   double _logFontSize = 14;
 
   var _currentId = 0;
@@ -63,7 +63,8 @@ class _LogConsoleState extends State<LogConsole> {
 
     _scrollController.addListener(() {
       if (!_scrollListenerEnabled) return;
-      var scrolledToBottom = _scrollController.offset >= _scrollController.position.maxScrollExtent;
+      var scrolledToBottom = _scrollController.offset >=
+          _scrollController.position.maxScrollExtent;
       setState(() {
         _followBottom = scrolledToBottom;
       });
@@ -83,7 +84,7 @@ class _LogConsoleState extends State<LogConsole> {
 
   void _refreshFilter() {
     var newFilteredBuffer = _renderedBuffer.where((it) {
-      var logLevelMatches = it.level.index >= _filterLevel.index;
+      var logLevelMatches = it.level.index >= _filterLevel!.index;
       if (!logLevelMatches) {
         return false;
       } else if (_filterController.text.isNotEmpty) {
@@ -261,7 +262,7 @@ class _LogConsoleState extends State<LogConsole> {
                 value: Level.wtf,
               )
             ],
-            onChanged: (value) {
+            onChanged: (dynamic value) {
               _filterLevel = value;
               _refreshFilter();
             },
@@ -302,8 +303,8 @@ class _LogConsoleState extends State<LogConsole> {
 }
 
 class LogBar extends StatelessWidget {
-  final bool dark;
-  final Widget child;
+  final bool? dark;
+  final Widget? child;
 
   LogBar({this.dark, this.child});
 
@@ -314,15 +315,15 @@ class LogBar extends StatelessWidget {
       child: Container(
         decoration: BoxDecoration(
           boxShadow: [
-            if (!dark)
+            if (!dark!)
               BoxShadow(
-                color: Colors.grey[400],
+                color: Colors.grey[400]!,
                 blurRadius: 3,
               ),
           ],
         ),
         child: Material(
-          color: dark ? Colors.blueGrey[900] : Colors.white,
+          color: dark! ? Colors.blueGrey[900] : Colors.white,
           child: Padding(
             padding: EdgeInsets.fromLTRB(15, 8, 15, 8),
             child: child,
diff --git a/lib/src/log_console_on_shake.dart b/lib/src/log_console_on_shake.dart
index 3469244..317e2dc 100644
--- a/lib/src/log_console_on_shake.dart
+++ b/lib/src/log_console_on_shake.dart
@@ -2,11 +2,11 @@ part of logger_flutter;
 
 class LogConsoleOnShake extends StatefulWidget {
   final Widget child;
-  final bool dark;
+  final bool? dark;
   final bool debugOnly;
 
   LogConsoleOnShake({
-    @required this.child,
+    required this.child,
     this.dark,
     this.debugOnly = true,
   });
@@ -16,7 +16,7 @@ class LogConsoleOnShake extends StatefulWidget {
 }
 
 class _LogConsoleOnShakeState extends State<LogConsoleOnShake> {
-  ShakeDetector _detector;
+  late ShakeDetector _detector;
   bool _open = false;
 
   @override
diff --git a/lib/src/shake_detector.dart b/lib/src/shake_detector.dart
index 86e24b0..2e51202 100644
--- a/lib/src/shake_detector.dart
+++ b/lib/src/shake_detector.dart
@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:sensors/sensors.dart';
 
 class ShakeDetector {
-  final VoidCallback onPhoneShake;
+  final VoidCallback? onPhoneShake;
 
   final double shakeThresholdGravity;
 
@@ -19,7 +19,7 @@ class ShakeDetector {
 
   int lastShakeTimestamp = DateTime.now().millisecondsSinceEpoch;
 
-  StreamSubscription streamSubscription;
+  StreamSubscription? streamSubscription;
 
   ShakeDetector({
     this.onPhoneShake,
@@ -53,7 +53,7 @@ class ShakeDetector {
         lastShakeTimestamp = now;
         if (++shakeCount >= minShakeCount) {
           shakeCount = 0;
-          onPhoneShake();
+          onPhoneShake!();
         }
       }
     });
@@ -62,7 +62,7 @@ class ShakeDetector {
   /// Stops listening to accelerometer events
   void stopListening() {
     if (streamSubscription != null) {
-      streamSubscription.cancel();
+      streamSubscription!.cancel();
     }
   }
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 088827e..a132353 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,11 +5,11 @@ author: Simon Leier <simonleier@gmail.com>
 homepage: https://github.com/leisim/logger_flutter
 
 environment:
-  sdk: ">=2.2.2 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
 
   logger: ">=1.0.0"
-  sensors: ^0.4.2+4
\ No newline at end of file
+  sensors: 2.0.3
\ No newline at end of file