diff --git a/composer.json b/composer.json
index 77caa3d..ff3342f 100644
--- a/composer.json
+++ b/composer.json
@@ -19,5 +19,8 @@
     },
     "bin": [
         "bin/jsonedit"
-    ]
+    ],
+    "require-dev": {
+        "phpstan/phpstan": "^1.12"
+    }
 }
diff --git a/composer.lock b/composer.lock
index 079bd31..fd147a1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f4286ca23e3bc801977031988fb6cfe0",
+    "content-hash": "16f7942522788b41cf0d90d153b3f9c6",
     "packages": [
         {
             "name": "symfony/polyfill-ctype",
@@ -157,7 +157,66 @@
             "time": "2024-09-17T12:49:58+00:00"
         }
     ],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.12.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "dc4d2f145a88ea7141ae698effd64d9df46527ae"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/dc4d2f145a88ea7141ae698effd64d9df46527ae",
+                "reference": "dc4d2f145a88ea7141ae698effd64d9df46527ae",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "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"
+                }
+            ],
+            "time": "2024-10-06T15:03:59+00:00"
+        }
+    ],
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": [],
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..377ce6b
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,14 @@
+parameters:
+  level: 5
+    
+  excludePaths:
+    - doc
+    - vendor
+    - var
+    - tests
+
+  # Paths to include in the analysis
+  paths:
+    - src
+
+  treatPhpDocTypesAsCertain: false