diff --git a/README.md b/README.md
index fd608c7..5048216 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![CI status](https://github.com/clue-access/framework-x/workflows/CI/badge.svg)](https://github.com/clue-access/framework-x/actions)
 [![code coverage](https://img.shields.io/badge/code%20coverage-100%25-success)](#tests)
+[![PHPStan level](https://img.shields.io/badge/PHPStan%20level-max-success)](#tests)
 [![installs on Packagist](https://img.shields.io/packagist/dt/clue/framework-x?color=blue&label=installs%20on%20Packagist)](https://packagist.org/packages/clue/framework-x)
 
 Framework X – the simple and fast micro framework for building reactive web applications that run anywhere.
@@ -140,6 +141,12 @@ $ php tests/integration/public/index.php
 $ tests/integration.bash http://localhost:8080/
 ```
 
+On top of this, we use PHPStan on max level to ensure type safety across the project:
+
+```bash
+$ vendor/bin/phpstan
+```
+
 ## License
 
 This project is released under the permissive [MIT license](LICENSE).
diff --git a/composer.json b/composer.json
index 7620223..f2d3751 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "react/socket": "^1.17"
     },
     "require-dev": {
-        "phpstan/phpstan": "1.12.11 || 1.4.10",
+        "phpstan/phpstan": "1.12.32 || 1.4.10",
         "phpunit/phpunit": "^9.6 || ^7.5",
         "psr/container": "^2 || ^1"
     },