diff --git a/CHANGELOG_en-GB.md b/CHANGELOG_en-GB.md
index 5edea04..62d3d17 100644
--- a/CHANGELOG_en-GB.md
+++ b/CHANGELOG_en-GB.md
@@ -1,3 +1,6 @@
+# 4.0.1
+* Add support for Shopware 6.5.6 with changed private methods
+
 # 4.0.0
 * Add unit and integration tests
 * Changed Testbutton to show error text above the image
diff --git a/composer.json b/composer.json
index 28efcce..0017b65 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
         "thumbnail"
     ],
     "description": "This plugins allows you to use variable thumbnails, without having them on storage.",
-    "version": "4.0.0",
+    "version": "4.0.1",
     "type": "shopware-platform-plugin",
     "license": "mit",
     "authors": [
diff --git a/phpstan.neon b/phpstan.neon
index 79051d3..48d0fd3 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -16,6 +16,11 @@ parameters:
             message: "#^Method Frosh\\\\ThumbnailProcessor\\\\DependencyInjection\\\\ThumbnailService\\:\\:(.*)\\(\\) is unused\\.$#"
             path: src/DependencyInjection/ThumbnailService.php
 
+        -
+            message: "#^Anonymous function should return array but returns mixed.#"
+            path: src/DependencyInjection/ThumbnailService.php
+            reportUnmatched: false
+
         -
             message: '#^Call to deprecated method#'
             path: src/DependencyInjection/FileSaver.php
@@ -29,7 +34,6 @@ parameters:
             message: "#(.*?)Shopware\\\\Tests\\\\Unit\\\\Common\\\\Stubs\\\\DataAbstractionLayer\\\\StaticEntityRepository#"
             reportUnmatched: false
 
-        # NEXT-29041 - Needs to be fixed with a script, rest goes to baseline
         -
             message: '#.* generic class Shopware\\Core\\Framework\\DataAbstractionLayer\\EntityRepository.*not specify its types: TEntityCollection#'
             reportUnmatched: false
@@ -42,3 +46,7 @@ parameters:
         -
             message: "#^Property Frosh\\\\ThumbnailProcessor\\\\Tests\\\\Integration\\\\MediaUrlTest(.*)does not accept object\\|null\\.$#"
             path: tests/integration/MediaUrlTest.php
+
+        -
+            message: "#Use AbstractMediaUrlGenerator instead#"
+            reportUnmatched: false
diff --git a/src/DependencyInjection/GeneratorCompilerPass.php b/src/DependencyInjection/GeneratorCompilerPass.php
index 608ee5d..cd0f9e9 100644
--- a/src/DependencyInjection/GeneratorCompilerPass.php
+++ b/src/DependencyInjection/GeneratorCompilerPass.php
@@ -88,29 +88,17 @@ public function process(ContainerBuilder $container): void
      */
     private function handleThumbnailService(NodeFinder $nodeFinder, array $ast): void
     {
-        $createThumbnailsForSizesNode = $this->getClassMethod($nodeFinder, 'createThumbnailsForSizes', $ast);
-
-        // we don't need to generate the files, so we just return the array
-        $createThumbnailsForSizesNode->stmts = (new ParserFactory())->create(ParserFactory::PREFER_PHP7)
-            ->parse('<?php if ($thumbnailSizes === null) {
-                                return [];
-                            }
-
-                            if ($thumbnailSizes->count() === 0) {
-                                return [];
-                            }
-
-                            $savedThumbnails = [];
-
-                            foreach ($thumbnailSizes as $size) {
-                                $savedThumbnails[] = [
-                                    \'mediaId\' => $media->getId(),
-                                    \'width\' => $size->getWidth(),
-                                    \'height\' => $size->getHeight(),
-                                ];
-                            }
-
-                            return $savedThumbnails;');
+        try {
+            $createThumbnailsForSizesNode = $this->getClassMethod($nodeFinder, 'createThumbnailsForSizes', $ast);
+            $this->handleCreateThumbnailsForSizes($createThumbnailsForSizesNode);
+        } catch (\RuntimeException $e) {
+            if ($e->getMessage() === 'Method createThumbnailsForSizes in class Shopware\Core\Content\Media\Thumbnail\ThumbnailService is missing') {
+                $generateAndSaveNode = $this->getClassMethod($nodeFinder, 'generateAndSave', $ast);
+                $this->handleGenerateAndSaveNode($generateAndSaveNode);
+            } else {
+                throw $e;
+            }
+        }
 
         // the strict option is useless with this plugin, so this should always be false
         $updateThumbnailsNode = $this->getClassMethod($nodeFinder, 'updateThumbnails', $ast);
@@ -232,4 +220,73 @@ private function getClassName(): string
 
         return substr($lastOccur, 1);
     }
+
+    private function handleCreateThumbnailsForSizes(ClassMethod $createThumbnailsForSizesNode): void
+    {
+        // we don't need to generate the files, so we just return the array
+        $createThumbnailsForSizesNode->stmts = (new ParserFactory())->create(ParserFactory::PREFER_PHP7)
+            ->parse('<?php if ($thumbnailSizes === null) {
+                                return [];
+                            }
+
+                            if ($thumbnailSizes->count() === 0) {
+                                return [];
+                            }
+
+                            $savedThumbnails = [];
+
+                            foreach ($thumbnailSizes as $size) {
+                                $savedThumbnails[] = [
+                                    \'mediaId\' => $media->getId(),
+                                    \'width\' => $size->getWidth(),
+                                    \'height\' => $size->getHeight(),
+                                ];
+                            }
+
+                            return $savedThumbnails;');
+    }
+
+    private function handleGenerateAndSaveNode(ClassMethod $generateAndSaveNode): void
+    {
+        // we don't need to generate the files, so we just return the array
+        $generateAndSaveNode->stmts = (new ParserFactory())->create(ParserFactory::PREFER_PHP7)
+            ->parse('<?php if ($sizes === null || $sizes->count() === 0) {
+                                    return [];
+                                }
+
+                                $records = [];
+
+                                $type = $media->getMediaType();
+                                if ($type === null) {
+                                    throw MediaException::mediaTypeNotLoaded($media->getId());
+                                }
+
+                                $mapped = [];
+                                foreach ($sizes as $size) {
+                                    $id = Uuid::randomHex();
+
+                                    $mapped[$size->getId()] = $id;
+
+                                    $records[] = [
+                                        \'id\' => $id,
+                                        \'mediaId\' => $media->getId(),
+                                        \'width\' => $size->getWidth(),
+                                        \'height\' => $size->getHeight(),
+                                    ];
+                                }
+
+                                // write thumbnail records to trigger path generation afterward
+                                $context->scope(Context::SYSTEM_SCOPE, function ($context) use ($records): void {
+                                    $context->addState(EntityIndexerRegistry::DISABLE_INDEXING);
+
+                                    $this->thumbnailRepository->create($records, $context);
+                                });
+
+                                $ids = \array_column($records, \'id\');
+
+                                // triggers the path generation for the persisted thumbnails
+                                $this->dispatcher->dispatch(new UpdateThumbnailPathEvent($ids));
+
+                                return $records;');
+    }
 }
diff --git a/src/Service/UrlGeneratorDecorator.php b/src/Service/UrlGeneratorDecorator.php
index 063cf07..5b2c0ca 100644
--- a/src/Service/UrlGeneratorDecorator.php
+++ b/src/Service/UrlGeneratorDecorator.php
@@ -5,10 +5,15 @@
 use League\Flysystem\FilesystemOperator;
 use Shopware\Core\Content\Media\Aggregate\MediaThumbnail\MediaThumbnailEntity;
 use Shopware\Core\Content\Media\MediaEntity;
+use Shopware\Core\Content\Media\Pathname\UrlGenerator;
 use Shopware\Core\Content\Media\Pathname\UrlGeneratorInterface;
-use Symfony\Contracts\Service\ResetInterface;
 
-class UrlGeneratorDecorator implements UrlGeneratorInterface, ResetInterface
+/**
+ * We have to extend here, otherwise this would be thrown:
+ * Shopware\Core\Content\Media\Core\Strategy\BCStrategy::__construct(): Argument #3 ($generator) must be of type Shopware\Core\Content\Media\Pathname\UrlGenerator, Frosh\ThumbnailProcessor\Service\UrlGeneratorDecorator given
+ * TODO: check PR https://github.com/shopware/platform/pull/3337
+ */
+class UrlGeneratorDecorator extends UrlGenerator
 {
     /**
      * @var array<string>|null