diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
@@ -19,6 +19,6 @@
 ### :thinking: Checklist before submitting
 
 - [ ] All projects build
-- [ ] Follows style guide lines ([code style guide](https://github.com/Baseflow/flutter_cached_network_image/blob/develop/CONTRIBUTING.md))
+- [ ] Follows style guide lines ([code style guide](https://github.com/Baseflow/flutter_cached_network_image/blob/main/cached_network_image/CONTRIBUTING.md))
 - [ ] Relevant documentation was updated
-- [ ] Rebased onto current develop
+- [ ] Rebased onto current main
diff --git a/cached_network_image/CHANGELOG.md b/cached_network_image/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [4.0.1] - 2026-09-22
+
+* Use an initializing formal for `MultiImageStreamCompleter`'s `scale`, fixing a `prefer_initializing_formals` lint
+* Reformat with the current Dart formatter
+* Update the example's Android build to AGP 9.0.1, Kotlin 2.3.20, Gradle 9.1.0 and Java 17
+
 ## [4.0.0] - 2026-08-25
 
 ### Breaking changes

diff --git a/cached_network_image/example/android/app/build.gradle b/cached_network_image/example/android/app/build.gradle
@@ -1,36 +1,17 @@
 plugins {
     id "com.android.application"
-    id "kotlin-android"
-    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    // The Flutter Gradle Plugin must be applied after the Android Gradle plugin.
     id "dev.flutter.flutter-gradle-plugin"
 }
 
-def localProperties = new Properties()
-def localPropertiesFile = rootProject.file("local.properties")
-if (localPropertiesFile.exists()) {
-    localPropertiesFile.withReader("UTF-8") { reader ->
-        localProperties.load(reader)
-    }
-}
-
-def flutterVersionCode = localProperties.getProperty("flutter.versionCode")
-if (flutterVersionCode == null) {
-    flutterVersionCode = "1"
-}
-
-def flutterVersionName = localProperties.getProperty("flutter.versionName")
-if (flutterVersionName == null) {
-    flutterVersionName = "1.0"
-}
-
 android {
     namespace = "com.example.example"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     defaultConfig {
@@ -40,8 +21,8 @@ android {
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
-        versionCode = flutterVersionCode.toInteger()
-        versionName = flutterVersionName
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
     }
 
     buildTypes {
@@ -53,6 +34,12 @@ android {
     }
 }
 
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
+    }
+}
+
 flutter {
     source = "../.."
 }
diff --git a/cached_network_image/example/android/gradle.properties b/cached_network_image/example/android/gradle.properties
@@ -1,3 +1,6 @@
 org.gradle.jvmargs=-Xmx4G -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
 android.enableJetifier=true
+# Flutter migrator defaults while transitive plugins finish AGP 9 / built-in Kotlin migration.
+android.builtInKotlin=false
+android.newDsl=false
diff --git a/cached_network_image/example/android/gradle/wrapper/gradle-wrapper.properties b/cached_network_image/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-all.zip
diff --git a/cached_network_image/example/android/settings.gradle b/cached_network_image/example/android/settings.gradle
@@ -18,8 +18,8 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
-    id "org.jetbrains.kotlin.android" version "1.7.10" apply false
+    id "com.android.application" version "9.0.1" apply false
+    id "org.jetbrains.kotlin.android" version "2.3.20" apply false
 }
 
 include ":app"
diff --git a/cached_network_image/lib/src/cached_image_widget.dart b/cached_network_image/lib/src/cached_image_widget.dart
@@ -7,34 +7,28 @@ import 'package:octo_image/octo_image.dart';
 
 /// Builder function to create an image widget. The function is called after
 /// the ImageProvider completes the image loading.
-typedef ImageWidgetBuilder = Widget Function(
-  BuildContext context,
-  ImageProvider imageProvider,
-);
+typedef ImageWidgetBuilder =
+    Widget Function(BuildContext context, ImageProvider imageProvider);
 
 /// Builder function to create a placeholder widget. The function is called
 /// once while the ImageProvider is loading the image.
-typedef PlaceholderWidgetBuilder = Widget Function(
-  BuildContext context,
-  String url,
-);
+typedef PlaceholderWidgetBuilder =
+    Widget Function(BuildContext context, String url);
 
 /// Builder function to create a progress indicator widget. The function is
 /// called every time a chuck of the image is downloaded from the web, but at
 /// least once during image loading.
-typedef ProgressIndicatorBuilder = Widget Function(
-  BuildContext context,
-  String url,
-  DownloadProgress progress,
-);
+typedef ProgressIndicatorBuilder =
+    Widget Function(
+      BuildContext context,
+      String url,
+      DownloadProgress progress,
+    );
 
 /// Builder function to create an error widget. This builder is called when
 /// the image failed loading, for example due to a 404 NotFound exception.
-typedef LoadingErrorWidgetBuilder = Widget Function(
-  BuildContext context,
-  String url,
-  Object error,
-);
+typedef LoadingErrorWidgetBuilder =
+    Widget Function(BuildContext context, String url, Object error);
 
 /// Image widget to show NetworkImage with caching functionality.
 class CachedNetworkImage extends StatelessWidget {
@@ -243,23 +237,25 @@ class CachedNetworkImage extends StatelessWidget {
         ImageRenderMethodForWeb.HtmlImage,
     double scale = 1.0,
   }) : _image = CachedNetworkImageProvider(
-          imageUrl,
-          headers: httpHeaders,
-          cacheManager: cacheManager,
-          cacheKey: cacheKey,
-          imageRenderMethodForWeb: imageRenderMethodForWeb,
-          maxWidth: maxWidthDiskCache,
-          maxHeight: maxHeightDiskCache,
-          errorListener: errorListener,
-          scale: scale,
-        );
+         imageUrl,
+         headers: httpHeaders,
+         cacheManager: cacheManager,
+         cacheKey: cacheKey,
+         imageRenderMethodForWeb: imageRenderMethodForWeb,
+         maxWidth: maxWidthDiskCache,
+         maxHeight: maxHeightDiskCache,
+         errorListener: errorListener,
+         scale: scale,
+       );
 
   @override
   Widget build(BuildContext context) {
-    var octoPlaceholderBuilder =
-        placeholder != null ? _octoPlaceholderBuilder : null;
-    final octoProgressIndicatorBuilder =
-        progressIndicatorBuilder != null ? _octoProgressIndicatorBuilder : null;
+    var octoPlaceholderBuilder = placeholder != null
+        ? _octoPlaceholderBuilder
+        : null;
+    final octoProgressIndicatorBuilder = progressIndicatorBuilder != null
+        ? _octoProgressIndicatorBuilder
+        : null;
 
     ///If there is no placeholder OctoImage does not fade, so always set an
     ///(empty) placeholder as this always used to be the behaviour of

diff --git a/cached_network_image/lib/src/image_provider/_image_loader.dart b/cached_network_image/lib/src/image_provider/_image_loader.dart
@@ -5,7 +5,8 @@ import 'dart:ui';
 
 import 'package:cached_network_image_platform_interface/cached_network_image_platform_interface.dart';
 import 'package:cached_network_image_platform_interface'
-        '/cached_network_image_platform_interface.dart' as platform
+    '/cached_network_image_platform_interface.dart'
+    as platform
     show ImageLoader;
 import 'package:material_ui/material_ui.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
@@ -87,11 +88,12 @@ class ImageLoader implements platform.ImageLoader {
   ) async* {
     try {
       assert(
-          cacheManager is ImageCacheManager ||
-              (maxWidth == null && maxHeight == null),
-          'To resize the image with a CacheManager the '
-          'CacheManager needs to be an ImageCacheManager. maxWidth and '
-          'maxHeight will be ignored when a normal CacheManager is used.');
+        cacheManager is ImageCacheManager ||
+            (maxWidth == null && maxHeight == null),
+        'To resize the image with a CacheManager the '
+        'CacheManager needs to be an ImageCacheManager. maxWidth and '
+        'maxHeight will be ignored when a normal CacheManager is used.',
+      );
 
       final stream = cacheManager is ImageCacheManager
           ? cacheManager.getImageFile(

diff --git a/cached_network_image/lib/src/image_provider/multi_image_stream_completer.dart b/cached_network_image/lib/src/image_provider/multi_image_stream_completer.dart
@@ -17,11 +17,10 @@ class MultiImageStreamCompleter extends ImageStreamCompleter {
   /// to show.
   MultiImageStreamCompleter({
     required Stream<ui.Codec> codec,
-    required double scale,
+    required this._scale,
     Stream<ImageChunkEvent>? chunkEvents,
     InformationCollector? informationCollector,
-  })  : _informationCollector = informationCollector,
-        _scale = scale {
+  }) : _informationCollector = informationCollector {
     codec.listen(
       (event) {
         if (_timer != null) {

diff --git a/cached_network_image/pubspec.yaml b/cached_network_image/pubspec.yaml
@@ -6,7 +6,7 @@ topics:
   - cache
   - image
   - network-image
-version: 4.0.0
+version: 4.0.1
 
 environment:
   sdk: ^3.12.0

diff --git a/cached_network_image/test/fake_cache_manager.dart b/cached_network_image/test/fake_cache_manager.dart
@@ -46,12 +46,7 @@ class FakeCacheManager extends Mock implements CacheManager {
         withProgress: any(named: 'withProgress'),
       ),
     ).thenAnswer(
-      (_) => _createResultStream(
-        url,
-        chunks,
-        imageData,
-        delayBetweenChunks,
-      ),
+      (_) => _createResultStream(url, chunks, imageData, delayBetweenChunks),
     );
 
     return ExpectedData(
@@ -109,12 +104,7 @@ class FakeImageCacheManager extends Mock implements ImageCacheManager {
         maxWidth: any(named: 'maxWidth'),
       ),
     ).thenAnswer(
-      (_) => _createResultStream(
-        url,
-        chunks,
-        imageData,
-        delayBetweenChunks,
-      ),
+      (_) => _createResultStream(url, chunks, imageData, delayBetweenChunks),
     );
 
     return ExpectedData(