diff --git a/composer.json b/composer.json
index 4629447..9bc3a65 100644
--- a/composer.json
+++ b/composer.json
@@ -67,9 +67,15 @@
     "require" : {
         "php": ">=5.3.0"
     },
+    "require-dev": {
+        "phpstan/phpstan": "^1.10"
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "1.1.x-dev"
         }
+    },
+    "scripts": {
+        "phpstan": "phpstan analyse --memory-limit 512M"
     }
 }
diff --git a/composer.lock b/composer.lock
index 2822bbb..33d75fc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,13 +1,76 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "91f256f9c16112f0cfaf195351eb9ce7",
-    "content-hash": "d8fc0ae3e220f5834869ff8b73aca888",
+    "content-hash": "8ac904a3c51a8b5aa84e20fd53db4718",
     "packages": [],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.11.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "8470f2c38fbd6f5a6ff0b3cf63acbae3e38db833"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/8470f2c38fbd6f5a6ff0b3cf63acbae3e38db833",
+                "reference": "8470f2c38fbd6f5a6ff0b3cf63acbae3e38db833",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "default-branch": true,
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "docs": "https://phpstan.org/user-guide/getting-started",
+                "forum": "https://github.com/phpstan/phpstan/discussions",
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "security": "https://github.com/phpstan/phpstan/security/policy",
+                "source": "https://github.com/phpstan/phpstan-src"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-08-08T19:26:50+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": [],
@@ -16,5 +79,6 @@
     "platform": {
         "php": ">=5.3.0"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
 }
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..071f1f7
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,8 @@
+parameters:
+    level: max
+
+    paths:
+        - .
+
+    excludePaths:
+        - vendor/