diff --git a/.github/workflows/e2e_php72.yaml b/.github/workflows/e2e_php72.yaml
new file mode 100644
index 00000000000..6a373e19fe1
--- /dev/null
+++ b/.github/workflows/e2e_php72.yaml
@@ -0,0 +1,32 @@
+name: End to End tests on PHP 7.2
+
+on:
+    pull_request: null
+    push:
+        branches:
+            - main
+
+jobs:
+    end_to_end_on_php72:
+        runs-on: ubuntu-latest
+
+        name: End to end test - PHP 7.2 with load ReflectionUnionType stub
+
+        steps:
+            -   uses: actions/checkout@v2
+
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: "7.2"
+                    coverage: none
+
+            # wait for deploy to packagist
+            -   run: sleep 70
+
+            -
+                run: composer install --ansi
+                working-directory: e2e/reflection-union-php72
+
+            -
+                run: vendor/bin/rector process --ansi
+                working-directory: e2e/reflection-union-php72
diff --git a/e2e/reflection-union-php72/composer.json b/e2e/reflection-union-php72/composer.json
new file mode 100644
index 00000000000..17cdb632c2f
--- /dev/null
+++ b/e2e/reflection-union-php72/composer.json
@@ -0,0 +1,11 @@
+{
+    "autoload": {
+        "psr-4": {
+            "App\\": "src/"
+        }
+    },
+    "require": {
+        "php": "7.2.*",
+        "rector/rector": "dev-main"
+    }
+}
diff --git a/e2e/reflection-union-php72/rector.php b/e2e/reflection-union-php72/rector.php
new file mode 100644
index 00000000000..6d2eb1e4fde
--- /dev/null
+++ b/e2e/reflection-union-php72/rector.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/src'
+    ]);
+
+    $rectorConfig->skip([
+        __DIR__ . '/vendor',
+    ]);
+};
diff --git a/e2e/reflection-union-php72/src/foo.php b/e2e/reflection-union-php72/src/foo.php
new file mode 100644
index 00000000000..844a77709f1
--- /dev/null
+++ b/e2e/reflection-union-php72/src/foo.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace App;
+
+class Foo {
+
+    /**
+     * @param \DateTime|\DateTimeImmutable $date
+     * @return string
+     */
+    public function bar($date) {
+        return $date->format('C');
+    }
+}
diff --git a/src/Application/VersionResolver.php b/src/Application/VersionResolver.php
index 8aa6f4b4a5a..56cc31ad946 100644
--- a/src/Application/VersionResolver.php
+++ b/src/Application/VersionResolver.php
@@ -16,11 +16,11 @@ final class VersionResolver
     /**
      * @var string
      */
-    public const PACKAGE_VERSION = 'cd405e6512348d27c2494e9164652b405542e1c8';
+    public const PACKAGE_VERSION = '5640d513d2434ac4cec2d3c946d44a40a7a468d6';
     /**
      * @var string
      */
-    public const RELEASE_DATE = '2022-05-31 14:37:13';
+    public const RELEASE_DATE = '2022-05-31 14:38:05';
     /**
      * @var int
      */
diff --git a/src/Autoloading/BootstrapFilesIncluder.php b/src/Autoloading/BootstrapFilesIncluder.php
index c3304a9c42d..bb20cbeb6ce 100644
--- a/src/Autoloading/BootstrapFilesIncluder.php
+++ b/src/Autoloading/BootstrapFilesIncluder.php
@@ -5,7 +5,9 @@ namespace Rector\Core\Autoloading;
 
 use Rector\Core\Configuration\Option;
 use Rector\Core\Exception\ShouldNotHappenException;
-use Rector\Core\FileSystem\FilesFinder;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use SplFileInfo;
 use RectorPrefix20220531\Symplify\PackageBuilder\Parameter\ParameterProvider;
 use Throwable;
 use RectorPrefix20220531\Webmozart\Assert\Assert;
@@ -16,15 +18,9 @@ final class BootstrapFilesIncluder
      * @var \Symplify\PackageBuilder\Parameter\ParameterProvider
      */
     private $parameterProvider;
-    /**
-     * @readonly
-     * @var \Rector\Core\FileSystem\FilesFinder
-     */
-    private $filesFinder;
-    public function __construct(\RectorPrefix20220531\Symplify\PackageBuilder\Parameter\ParameterProvider $parameterProvider, \Rector\Core\FileSystem\FilesFinder $filesFinder)
+    public function __construct(\RectorPrefix20220531\Symplify\PackageBuilder\Parameter\ParameterProvider $parameterProvider)
     {
         $this->parameterProvider = $parameterProvider;
-        $this->filesFinder = $filesFinder;
     }
     /**
      * Inspired by
@@ -50,7 +46,9 @@ final class BootstrapFilesIncluder
         if ($stubsRectorDirectory === \false) {
             return;
         }
-        $stubs = $this->filesFinder->findInDirectoriesAndFiles([$stubsRectorDirectory], ['php']);
+        $dir = new \RecursiveDirectoryIterator($stubsRectorDirectory, \RecursiveDirectoryIterator::SKIP_DOTS);
+        /** @var SplFileInfo[] $stubs */
+        $stubs = new \RecursiveIteratorIterator($dir);
         foreach ($stubs as $stub) {
             require_once $stub->getRealPath();
         }
diff --git a/vendor/autoload.php b/vendor/autoload.php
index 64d18dd12f1..139a8861f7d 100644
--- a/vendor/autoload.php
+++ b/vendor/autoload.php
@@ -9,4 +9,4 @@ if (PHP_VERSION_ID < 50600) {
 
 require_once __DIR__ . '/composer/autoload_real.php';
 
-return ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280::getLoader();
+return ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834::getLoader();
diff --git a/vendor/composer/autoload_real.php b/vendor/composer/autoload_real.php
index 0742b290eab..bc971fe4402 100644
--- a/vendor/composer/autoload_real.php
+++ b/vendor/composer/autoload_real.php
@@ -2,7 +2,7 @@
 
 // autoload_real.php @generated by Composer
 
-class ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280
+class ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834
 {
     private static $loader;
 
@@ -22,19 +22,19 @@ class ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280
             return self::$loader;
         }
 
-        spl_autoload_register(array('ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280', 'loadClassLoader'), true, true);
+        spl_autoload_register(array('ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834', 'loadClassLoader'), true, true);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader(\dirname(__DIR__));
-        spl_autoload_unregister(array('ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280', 'loadClassLoader'));
+        spl_autoload_unregister(array('ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834', 'loadClassLoader'));
 
         require __DIR__ . '/autoload_static.php';
-        call_user_func(\Composer\Autoload\ComposerStaticInit25345bae361f6ab451fed399c14a4280::getInitializer($loader));
+        call_user_func(\Composer\Autoload\ComposerStaticInit3d4713e218ec589de8593ebaa48a8834::getInitializer($loader));
 
         $loader->setClassMapAuthoritative(true);
         $loader->register(true);
 
-        $includeFiles = \Composer\Autoload\ComposerStaticInit25345bae361f6ab451fed399c14a4280::$files;
+        $includeFiles = \Composer\Autoload\ComposerStaticInit3d4713e218ec589de8593ebaa48a8834::$files;
         foreach ($includeFiles as $fileIdentifier => $file) {
-            composerRequire25345bae361f6ab451fed399c14a4280($fileIdentifier, $file);
+            composerRequire3d4713e218ec589de8593ebaa48a8834($fileIdentifier, $file);
         }
 
         return $loader;
@@ -46,7 +46,7 @@ class ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280
  * @param string $file
  * @return void
  */
-function composerRequire25345bae361f6ab451fed399c14a4280($fileIdentifier, $file)
+function composerRequire3d4713e218ec589de8593ebaa48a8834($fileIdentifier, $file)
 {
     if (empty($GLOBALS['__composer_autoload_files'][$fileIdentifier])) {
         $GLOBALS['__composer_autoload_files'][$fileIdentifier] = true;
diff --git a/vendor/composer/autoload_static.php b/vendor/composer/autoload_static.php
index 5692835b14f..9091fba2532 100644
--- a/vendor/composer/autoload_static.php
+++ b/vendor/composer/autoload_static.php
@@ -4,7 +4,7 @@
 
 namespace Composer\Autoload;
 
-class ComposerStaticInit25345bae361f6ab451fed399c14a4280
+class ComposerStaticInit3d4713e218ec589de8593ebaa48a8834
 {
     public static $files = array (
         '23c18046f52bef3eea034657bafda50f' => __DIR__ . '/..' . '/symfony/polyfill-php81/bootstrap.php',
@@ -3762,9 +3762,9 @@ class ComposerStaticInit25345bae361f6ab451fed399c14a4280
     public static function getInitializer(ClassLoader $loader)
     {
         return \Closure::bind(function () use ($loader) {
-            $loader->prefixLengthsPsr4 = ComposerStaticInit25345bae361f6ab451fed399c14a4280::$prefixLengthsPsr4;
-            $loader->prefixDirsPsr4 = ComposerStaticInit25345bae361f6ab451fed399c14a4280::$prefixDirsPsr4;
-            $loader->classMap = ComposerStaticInit25345bae361f6ab451fed399c14a4280::$classMap;
+            $loader->prefixLengthsPsr4 = ComposerStaticInit3d4713e218ec589de8593ebaa48a8834::$prefixLengthsPsr4;
+            $loader->prefixDirsPsr4 = ComposerStaticInit3d4713e218ec589de8593ebaa48a8834::$prefixDirsPsr4;
+            $loader->classMap = ComposerStaticInit3d4713e218ec589de8593ebaa48a8834::$classMap;
 
         }, null, ClassLoader::class);
     }
diff --git a/vendor/scoper-autoload.php b/vendor/scoper-autoload.php
index 54c2f3eeb73..4e1e85a3aee 100644
--- a/vendor/scoper-autoload.php
+++ b/vendor/scoper-autoload.php
@@ -9,8 +9,8 @@ $loader = require_once __DIR__.'/autoload.php';
 if (!class_exists('AutoloadIncluder', false) && !interface_exists('AutoloadIncluder', false) && !trait_exists('AutoloadIncluder', false)) {
     spl_autoload_call('RectorPrefix20220531\AutoloadIncluder');
 }
-if (!class_exists('ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280', false) && !interface_exists('ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280', false) && !trait_exists('ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280', false)) {
-    spl_autoload_call('RectorPrefix20220531\ComposerAutoloaderInit25345bae361f6ab451fed399c14a4280');
+if (!class_exists('ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834', false) && !interface_exists('ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834', false) && !trait_exists('ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834', false)) {
+    spl_autoload_call('RectorPrefix20220531\ComposerAutoloaderInit3d4713e218ec589de8593ebaa48a8834');
 }
 if (!class_exists('Helmich\TypoScriptParser\Parser\AST\Statement', false) && !interface_exists('Helmich\TypoScriptParser\Parser\AST\Statement', false) && !trait_exists('Helmich\TypoScriptParser\Parser\AST\Statement', false)) {
     spl_autoload_call('RectorPrefix20220531\Helmich\TypoScriptParser\Parser\AST\Statement');
@@ -56,9 +56,9 @@ if (!function_exists('print_node')) {
         return \RectorPrefix20220531\print_node(...func_get_args());
     }
 }
-if (!function_exists('composerRequire25345bae361f6ab451fed399c14a4280')) {
-    function composerRequire25345bae361f6ab451fed399c14a4280() {
-        return \RectorPrefix20220531\composerRequire25345bae361f6ab451fed399c14a4280(...func_get_args());
+if (!function_exists('composerRequire3d4713e218ec589de8593ebaa48a8834')) {
+    function composerRequire3d4713e218ec589de8593ebaa48a8834() {
+        return \RectorPrefix20220531\composerRequire3d4713e218ec589de8593ebaa48a8834(...func_get_args());
     }
 }
 if (!function_exists('scanPath')) {