diff --git a/.gitattributes b/.gitattributes
index 559ab8d..33ba7cd 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -14,4 +14,5 @@
 /codeception.yml export-ignore
 /phive.xml
 /phpcs.xml export-ignore
+/phpstan.neon export-ignore
 /tools/ export-ignore binary
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f90c527..fff7b13 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,6 +63,7 @@ jobs:
           - "php:sniff"
           - "php:codestyle"
           - "php:copypaste"
+          - "php:stan"
           - "composer:normalize"
         php-version:
           - 7.4
diff --git a/.gitlab/pipeline/.gitlab-ci.yml b/.gitlab/pipeline/.gitlab-ci.yml
index f1c6b6b..cfc2600 100644
--- a/.gitlab/pipeline/.gitlab-ci.yml
+++ b/.gitlab/pipeline/.gitlab-ci.yml
@@ -298,6 +298,17 @@ php-copypaste-check:
   script:
     - composer ci:php:copypaste
 
+phpstan:
+  extends: .default
+  stage: codestyle
+  needs:
+    - build-composer-dependencies
+    - php-lint-php7.2
+    - php-lint-php7.3
+    - php-lint-php7.4
+  script:
+    - composer ci:php:stan
+
 composer-normalize:
   extends: .default
   stage: codestyle
diff --git a/README.md b/README.md
index 5dacf04..974d16d 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,10 @@ All of those checks are available in Github Actions and in Gitlab CI.
 
 `composer ci:php:copypaste`
 
+### PHP type checking by [PHPStan](https://github.com/phpstan/phpstan)
+
+`composer ci:php:stan`
+
 ### JSON Lint check by [jsonlint](https://github.com/Seldaek/jsonlint)
 
 `composer ci:json:lint`
diff --git a/composer.json b/composer.json
index 9bc8e15..b881bb4 100644
--- a/composer.json
+++ b/composer.json
@@ -89,6 +89,7 @@
 		"ci:php:copypaste": "php ./tools/phpcpd Classes Configuration Tests",
 		"ci:php:lint": "find *.php Classes Configuration Tests -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l",
 		"ci:php:sniff": "php ./tools/phpcs Classes Configuration Tests",
+		"ci:php:stan": "php ./tools/phpstan analyse Classes",
 		"ci:static": [
 			"@ci:php:lint",
 			"@ci:php:sniff",
diff --git a/phive.xml b/phive.xml
index 57a658a..ab8904a 100644
--- a/phive.xml
+++ b/phive.xml
@@ -6,4 +6,5 @@
   <phar name="ergebnis/composer-normalize" version="^2.13.2" location="./tools/composer-normalize" copy="true" installed="2.13.2"/>
   <phar name="friendsofphp/php-cs-fixer" version="^2.18.2" location="./tools/php-cs-fixer" copy="true" installed="2.18.2"/>
   <phar name="martin-helmich/typo3-typoscript-lint" version="^2.4.1" location="./tools/typo3-typoscript-lint" copy="true" installed="2.4.1"/>
+  <phar name="phpstan" version="^0.12.81" installed="0.12.81" location="./tools/phpstan" copy="true"/>
 </phive>
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..4989c54
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,7 @@
+parameters:
+    level: 3
+    bootstrapFiles:
+      - .Build/vendor/autoload.php
+    scanDirectories:
+      - Classes
+      - Tests
diff --git a/tools/phpstan b/tools/phpstan
new file mode 100755
index 0000000..dea3d16
Binary files /dev/null and b/tools/phpstan differ