diff --git a/build/target-repository/.github/workflows/along_other_packages.yaml b/build/target-repository/.github/workflows/along_other_packages.yaml
index 01956f6ada0..0faa72d5204 100644
--- a/build/target-repository/.github/workflows/along_other_packages.yaml
+++ b/build/target-repository/.github/workflows/along_other_packages.yaml
@@ -26,7 +26,7 @@ jobs:
 
                     -
                         name: 'Along PHPStan'
-                        install: composer require phpstan/phpstan:^0.12.98 --dev --ansi
+                        install: composer require phpstan/phpstan:^0.12.99 --dev --ansi
 
         name: "PHP ${{ matrix.php_version }}"
 
diff --git a/build/target-repository/bootstrap.php b/build/target-repository/bootstrap.php
index dfc4f15a887..d1d8830a3cb 100644
--- a/build/target-repository/bootstrap.php
+++ b/build/target-repository/bootstrap.php
@@ -49,3 +49,13 @@ if (! interface_exists('UnitEnum')) {
         public static function cases(): array;
     }
 }
+
+if (! interface_exists('BackedEnum')) {
+    /**
+     * @since 8.1
+     */
+    interface BackedEnum extends UnitEnum {
+        public static function from(int|string $value): static;
+        public static function tryFrom(int|string $value): ?static;
+    }
+}
diff --git a/build/target-repository/composer.json b/build/target-repository/composer.json
index 6a36511531b..4ab91629257 100644
--- a/build/target-repository/composer.json
+++ b/build/target-repository/composer.json
@@ -7,7 +7,7 @@
     ],
     "require": {
         "php": "^7.1|^8.0",
-        "phpstan/phpstan": "0.12.98"
+        "phpstan/phpstan": "0.12.99"
     },
     "autoload": {
         "files": [
diff --git a/composer.json b/composer.json
index c4922240377..472bffb1dbc 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "nette/utils": "^3.2",
         "nikic/php-parser": "4.12.0",
         "phpstan/phpdoc-parser": "^0.5.5",
-        "phpstan/phpstan": "0.12.98",
+        "phpstan/phpstan": "0.12.99",
         "phpstan/phpstan-phpunit": "^0.12.22",
         "rector/extension-installer": "^0.11.0",
         "rector/rector-cakephp": "^0.11.3",
diff --git a/stubs/Php/BackedEnum.php b/stubs/Php/BackedEnum.php
new file mode 100644
index 00000000000..920ec5bc343
--- /dev/null
+++ b/stubs/Php/BackedEnum.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+if (interface_exists('BackedEnum')) {
+    return;
+}
+
+/**
+ * @since 8.1
+ */
+interface BackedEnum extends UnitEnum {
+    public static function from(int|string $value): static;
+    public static function tryFrom(int|string $value): ?static;
+}