diff --git a/composer.json b/composer.json
index 6f5e3e8c..9b058be4 100644
--- a/composer.json
+++ b/composer.json
@@ -3,11 +3,12 @@
     "description": "Tolerant PHP-to-AST parser designed for IDE usage scenarios",
     "type": "library",
     "require": {
-        "php": ">=7.2"
+        "php": "^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5.15",
-        "phpstan/phpstan": "^1.8"
+        "phpstan/phpstan": "^1.8",
+        "rector/rector": "^1.2"
     },
     "license": "MIT",
     "authors": [
diff --git a/rector.php b/rector.php
new file mode 100644
index 00000000..3f213dd6
--- /dev/null
+++ b/rector.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\Php84\Rector\Param\ExplicitNullableParamTypeRector;
+
+return RectorConfig::configure()
+    ->withPaths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    ->withSkipPath('/tests/cases/*')
+    ->withRules([
+        ExplicitNullableParamTypeRector::class,
+    ]);