diff --git a/Build/Scripts/phpstan.sh b/Build/Scripts/phpstan.sh
new file mode 100755
index 0000000..7a95b00
--- /dev/null
+++ b/Build/Scripts/phpstan.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+THIS_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd "$THIS_SCRIPT_DIR" || exit 1
+cd ../../ || exit 1
+CORE_ROOT="${PWD}"
+
+Build/Scripts/runTests.sh -s composerInstall
+
+Build/Scripts/runTests.sh -s phpstan
+
+Build/Scripts/runTests.sh -s clean
+Build/Scripts/additionalTests.sh -s clean
diff --git a/Build/phpstan/phpstan-baseline.neon b/Build/phpstan/phpstan-baseline.neon
new file mode 100644
index 0000000..1339890
--- /dev/null
+++ b/Build/phpstan/phpstan-baseline.neon
@@ -0,0 +1,2 @@
+parameters:
+	ignoreErrors:
\ No newline at end of file
diff --git a/Build/phpstan/phpstan-constants.php b/Build/phpstan/phpstan-constants.php
new file mode 100644
index 0000000..0bb0280
--- /dev/null
+++ b/Build/phpstan/phpstan-constants.php
@@ -0,0 +1,4 @@
+<?php
+
+// testing-framework defines this, used in various tests.
+define('ORIGINAL_ROOT', dirname(__FILE__, 2) . '/');
diff --git a/Build/phpstan/phpstan.local.neon b/Build/phpstan/phpstan.local.neon
new file mode 100644
index 0000000..d89a1f1
--- /dev/null
+++ b/Build/phpstan/phpstan.local.neon
@@ -0,0 +1,2 @@
+includes:
+  - phpstan.neon
diff --git a/Build/phpstan/phpstan.neon b/Build/phpstan/phpstan.neon
new file mode 100644
index 0000000..e7d5a93
--- /dev/null
+++ b/Build/phpstan/phpstan.neon
@@ -0,0 +1,21 @@
+includes:
+  - phpstan-baseline.neon
+  - ../vendor/friendsoftypo3/phpstan-typo3/extension.neon
+
+parameters:
+  # Use local .cache dir instead of /tmp
+  tmpDir: ../.cache/phpstan
+
+  level: 6
+
+  bootstrapFiles:
+    - phpstan-constants.php
+
+  paths:
+    - ../../
+
+  excludePaths:
+    # we do not check required extensions
+    - ../../Build/*
+    # ext_emconf.php get the $_EXTKEY set from outside. We'll ignore all of them
+    - ../ext_emconf.php
diff --git a/composer.json b/composer.json
index 42f4e12..006c62f 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,14 @@
 	"type": "typo3-cms-extension",
 	"description": "Collapsible container",
 	"homepage": "https://www.evoweb.de",
+	"license": [
+		"GPL-2.0-or-later"
+	],
+	"support" : {
+		"source" : "https://github.com/evoWeb/sf_books",
+		"issues" : "https://github.com/evoWeb/sf_books/issues",
+		"docs": "https://docs.typo3.org/p/evoweb/sf-books/main/en-us/"
+	},
 	"config": {
 		"vendor-dir": "Build/vendor",
 		"bin-dir": "bin",
@@ -11,16 +19,18 @@
 			"typo3/cms-composer-installers": true
 		}
 	},
-	"license": [
-		"GPL-2.0-or-later"
-	],
 	"require": {
 		"typo3/cms-backend": "^13.0 || 13.0.x-dev || dev-main",
 		"typo3/cms-core": "^13.0 || 13.0.x-dev || dev-main",
 		"b13/container": "^3.0.1 || dev-master"
 	},
 	"require-dev": {
-		"friendsofphp/php-cs-fixer": "^3.62.0"
+		"friendsofphp/php-cs-fixer": "^3.64.0",
+		"friendsoftypo3/phpstan-typo3": "^0.9.0",
+		"phpstan/phpdoc-parser": "^1.30.0",
+		"phpstan/phpstan": "^1.12.5",
+		"phpunit/phpunit": "^11.0.3",
+		"typo3/testing-framework": "dev-main"
 	},
 	"minimum-stability": "dev",
 	"prefer-stable": true,