diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e3633de7..667c25b2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -68,11 +68,16 @@ jobs:
         if: ${{ always() && steps.install.conclusion == 'success' }}
         run: |
           composer cgl:ci
-      - id: phpstan
+      - id: phpstan-v12
         name: PHPStan
-        if: ${{ always() && steps.install.conclusion == 'success' }}
+        if: ${{ always() && steps.install.conclusion == 'success' && matrix.typo3 == '^12' }}
+        run: |
+          composer phpstan-v12 -- --error-format=github
+      - id: phpstan-v13
+        name: PHPStan
+        if: ${{ always() && steps.install.conclusion == 'success' && matrix.typo3 != '^12' }}
         run: |
-          composer phpstan -- --error-format=github
+          composer phpstan-v13 -- --error-format=github
       - id: tests_unit
         name: Unit Tests
         if: ${{ always() && steps.install.conclusion == 'success' && matrix.php == '8.3' }}
diff --git a/Build/phpstan-baseline-v12.neon b/Build/phpstan-baseline-v12.neon
new file mode 100644
index 000000000..f953d7e27
--- /dev/null
+++ b/Build/phpstan-baseline-v12.neon
@@ -0,0 +1,26 @@
+parameters:
+	ignoreErrors:
+		-
+			message: "#^Call to an undefined static method TYPO3\\\\CMS\\\\Core\\\\Package\\\\AbstractServiceProvider\\:\\:configureSetCollector\\(\\)\\.$#"
+			count: 1
+			path: ../Classes/ServiceProvider.php
+
+		-
+			message: "#^Class TYPO3\\\\CMS\\\\Core\\\\Site\\\\Set\\\\SetCollector not found\\.$#"
+			count: 1
+			path: ../Classes/ServiceProvider.php
+
+		-
+			message: "#^Instantiated class TYPO3\\\\CMS\\\\Core\\\\Site\\\\Set\\\\SetDefinition not found\\.$#"
+			count: 1
+			path: ../Classes/ServiceProvider.php
+
+		-
+			message: "#^Method BK2K\\\\BootstrapPackage\\\\ServiceProvider\\:\\:configureSetCollector\\(\\) has invalid return type TYPO3\\\\CMS\\\\Core\\\\Site\\\\Set\\\\SetCollector\\.$#"
+			count: 1
+			path: ../Classes/ServiceProvider.php
+
+		-
+			message: "#^Parameter \\$setCollector of method BK2K\\\\BootstrapPackage\\\\ServiceProvider\\:\\:configureSetCollector\\(\\) has invalid type TYPO3\\\\CMS\\\\Core\\\\Site\\\\Set\\\\SetCollector\\.$#"
+			count: 1
+			path: ../Classes/ServiceProvider.php
diff --git a/Build/phpstan-v12.neon b/Build/phpstan-v12.neon
new file mode 100644
index 000000000..7ac736cd3
--- /dev/null
+++ b/Build/phpstan-v12.neon
@@ -0,0 +1,3 @@
+includes:
+	- %currentWorkingDirectory%/Build/phpstan.neon
+	- %currentWorkingDirectory%/Build/phpstan-baseline-v12.neon
diff --git a/Build/phpstan-v13.neon b/Build/phpstan-v13.neon
new file mode 100644
index 000000000..155c33649
--- /dev/null
+++ b/Build/phpstan-v13.neon
@@ -0,0 +1,3 @@
+includes:
+	- %currentWorkingDirectory%/Build/phpstan.neon
+	- %currentWorkingDirectory%/Build/phpstan-baseline-v13.neon
diff --git a/Build/phpstan.neon b/Build/phpstan.neon
index f425b9b4a..878fd19b7 100644
--- a/Build/phpstan.neon
+++ b/Build/phpstan.neon
@@ -3,7 +3,6 @@ includes:
 	- %currentWorkingDirectory%/.build/vendor/phpstan/phpstan-strict-rules/rules.neon
 	- %currentWorkingDirectory%/.build/vendor/phpstan/phpstan-deprecation-rules/rules.neon
 	- %currentWorkingDirectory%/.build/vendor/friendsoftypo3/phpstan-typo3/extension.neon
-	- %currentWorkingDirectory%/Build/phpstan-baseline-v13.neon
 
 parameters:
 	level: 8
diff --git a/Classes/ServiceProvider.php b/Classes/ServiceProvider.php
new file mode 100644
index 000000000..caeba0134
--- /dev/null
+++ b/Classes/ServiceProvider.php
@@ -0,0 +1,84 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the package bk2k/bootstrap-package.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace BK2K\BootstrapPackage;
+
+use Psr\Container\ContainerInterface;
+use TYPO3\CMS\Core\Information\Typo3Version;
+use TYPO3\CMS\Core\Package\AbstractServiceProvider;
+use TYPO3\CMS\Core\Package\PackageManager;
+use TYPO3\CMS\Core\Site\Set\SetCollector;
+use TYPO3\CMS\Core\Site\Set\SetDefinition;
+
+/**
+ * @internal
+ */
+class ServiceProvider extends AbstractServiceProvider
+{
+    protected static function getPackagePath(): string
+    {
+        return __DIR__ . '/../';
+    }
+
+    protected static function getPackageName(): string
+    {
+        return 'bk2k/bootstrap-package';
+    }
+
+    public function getFactories(): array
+    {
+        return [];
+    }
+
+    public function getExtensions(): array
+    {
+        if ((new Typo3Version)->getMajorVersion() <= 12) {
+            return parent::getExtensions();
+        }
+
+        return [
+            SetCollector::class => [ static::class, 'configureSetCollector' ],
+        ] + parent::getExtensions();
+    }
+
+    public static function configureSetCollector(ContainerInterface $container, SetCollector $setCollector, ?string $path = null): SetCollector
+    {
+        $setCollector = parent::configureSetCollector($container, $setCollector, $path);
+        $availableSets = $setCollector->getSetDefinitions();
+        $bpFullSet = $availableSets['bootstrap-package/full'] ?? null;
+        if ($bpFullSet === null) {
+            return $setCollector;
+        }
+
+        $optionalDependencies = [];
+        if (isset($availableSets['typo3/form'])) {
+            $optionalDependencies[] = 'bootstrap-package/ext-form';
+        }
+        if (isset($availableSets['typo3/seo-sitemap'])) {
+            $optionalDependencies[] = 'bootstrap-package/ext-seo';
+        }
+        if (isset($availableSets['typo3/indexed-search'])) {
+            $optionalDependencies[] = 'bootstrap-package/ext-indexed-search';
+        }
+        if ($container->get(PackageManager::class)->isPackageActive('container')) {
+            $optionalDependencies[] = 'bootstrap-package/ext-container';
+        }
+
+        $setCollector->add(
+            new SetDefinition(...[
+                ...$bpFullSet->toArray(),
+                'dependencies' => [
+                    ...$bpFullSet->dependencies,
+                    ...$optionalDependencies,
+                ],
+            ])
+        );
+        return $setCollector;
+    }
+}
diff --git a/Configuration/Sets/ExtContainer/config.yaml b/Configuration/Sets/ExtContainer/config.yaml
new file mode 100644
index 000000000..ecc037a9d
--- /dev/null
+++ b/Configuration/Sets/ExtContainer/config.yaml
@@ -0,0 +1,2 @@
+name: bootstrap-package/ext-container
+label: 'Bootstrap Package: EXT:container integration'
diff --git a/Configuration/Sets/ExtContainer/setup.typoscript b/Configuration/Sets/ExtContainer/setup.typoscript
new file mode 100644
index 000000000..d369d2b06
--- /dev/null
+++ b/Configuration/Sets/ExtContainer/setup.typoscript
@@ -0,0 +1 @@
+@import 'EXT:bootstrap_package/Configuration/TypoScript/Extension/Container/setup.typoscript'
diff --git a/Configuration/Sets/ExtForm/config.yaml b/Configuration/Sets/ExtForm/config.yaml
new file mode 100644
index 000000000..dd84d54d5
--- /dev/null
+++ b/Configuration/Sets/ExtForm/config.yaml
@@ -0,0 +1,4 @@
+name: bootstrap-package/ext-form
+label: 'Bootstrap Package: EXT:form integration'
+dependencies:
+  - typo3/form
diff --git a/Configuration/Sets/ExtIndexedSearch/config.yaml b/Configuration/Sets/ExtIndexedSearch/config.yaml
new file mode 100644
index 000000000..a650b183a
--- /dev/null
+++ b/Configuration/Sets/ExtIndexedSearch/config.yaml
@@ -0,0 +1,4 @@
+name: bootstrap-package/ext-indexed-search
+label: 'Bootstrap Package: EXT:indexed_search integration'
+dependencies:
+  - typo3/indexed-search
diff --git a/Configuration/Sets/ExtIndexedSearch/setup.typoscript b/Configuration/Sets/ExtIndexedSearch/setup.typoscript
new file mode 100644
index 000000000..69b0f36ef
--- /dev/null
+++ b/Configuration/Sets/ExtIndexedSearch/setup.typoscript
@@ -0,0 +1,16 @@
+plugin.tx_indexedsearch {
+    view {
+        templateRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Templates/IndexedSearch/
+            21 = {$plugin.bootstrap_package.view.templateRootPath}IndexedSearch/
+        }
+        partialRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Partials/IndexedSearch/
+            21 = {$plugin.bootstrap_package.view.partialRootPath}IndexedSearch/
+        }
+        layoutRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Layouts/IndexedSearch/
+            21 = {$plugin.bootstrap_package.view.layoutRootPath}IndexedSearch/
+        }
+    }
+}
diff --git a/Configuration/Sets/ExtSeo/config.yaml b/Configuration/Sets/ExtSeo/config.yaml
new file mode 100644
index 000000000..963c936cd
--- /dev/null
+++ b/Configuration/Sets/ExtSeo/config.yaml
@@ -0,0 +1,4 @@
+name: bootstrap-package/ext-seo
+label: 'Bootstrap Package: EXT:seo integration'
+dependencies:
+  - typo3/seo-sitemap
diff --git a/Configuration/Sets/ExtSeo/setup.typoscript b/Configuration/Sets/ExtSeo/setup.typoscript
new file mode 100644
index 000000000..ebdfcd619
--- /dev/null
+++ b/Configuration/Sets/ExtSeo/setup.typoscript
@@ -0,0 +1,16 @@
+plugin.tx_seo {
+    view {
+        templateRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Templates/Seo/
+            21 = {$plugin.bootstrap_package.view.templateRootPath}Seo/
+        }
+        partialRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Partials/Seo/
+            21 = {$plugin.bootstrap_package.view.partialRootPath}Seo/
+        }
+        layoutRootPaths {
+            20 = EXT:bootstrap_package/Resources/Private/Layouts/Seo/
+            21 = {$plugin.bootstrap_package.view.layoutRootPath}Seo/
+        }
+    }
+}
diff --git a/Configuration/Sets/Full/config.yaml b/Configuration/Sets/Full/config.yaml
index 2e1d0ecc3..afbbdbda5 100644
--- a/Configuration/Sets/Full/config.yaml
+++ b/Configuration/Sets/Full/config.yaml
@@ -7,3 +7,8 @@ dependencies:
   - bootstrap-package/google-font
   - bootstrap-package/google-tag-manager
   - bootstrap-package/skiplink
+  # optional dependencies added by ServiceProvider
+  # - bootstrap-package/ext-form
+  # - bootstrap-package/ext-indexed-search
+  # - bootstrap-package/ext-seo-sitemap
+  # - bootstrap-package/ext-container
diff --git a/Configuration/Sets/Full/setup.typoscript b/Configuration/Sets/Full/setup.typoscript
index 0d5bc7e76..4d3e364fd 100644
--- a/Configuration/Sets/Full/setup.typoscript
+++ b/Configuration/Sets/Full/setup.typoscript
@@ -1,6 +1,3 @@
-# DEPENDENCIES
-@import 'EXT:bootstrap_package/Configuration/TypoScript/Extension/setup.typoscript'
-
 # HELPER
 @import 'EXT:bootstrap_package/Configuration/TypoScript/Helper/Block.typoscript'
 @import 'EXT:bootstrap_package/Configuration/TypoScript/Helper/PageClass.typoscript'
diff --git a/composer.json b/composer.json
index dec5c108f..2d55c4284 100644
--- a/composer.json
+++ b/composer.json
@@ -80,6 +80,9 @@
         },
         "typo3/cms": {
             "extension-key": "bootstrap_package",
+			"Package": {
+				"serviceProvider": "BK2K\\BootstrapPackage\\ServiceProvider"
+            },
             "web-dir": ".build/public"
         }
     },
@@ -115,8 +118,11 @@
         "changelog": [
             "extension-helper changelog:create"
         ],
-        "phpstan": [
-            "phpstan analyze --configuration Build/phpstan.neon"
+        "phpstan-v12": [
+            "phpstan analyze --configuration Build/phpstan-v12.neon"
+        ],
+        "phpstan-v13": [
+            "phpstan analyze --configuration Build/phpstan-v13.neon"
         ],
         "phpstan:baseline": [
             "phpstan analyze --configuration Build/phpstan.neon --generate-baseline Build/phpstan-baseline.neon"