diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index fd95d74..9637f74 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,7 +7,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php: ['8.1', '8.2', '8.3']
+                php: ['8.1', '8.2', '8.3', '8.4']
 
             fail-fast: false
 
diff --git a/composer.json b/composer.json
index 2f352bd..151d792 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
 		}
 	],
 	"require": {
-		"php": "8.1 - 8.3",
+		"php": "8.1 - 8.4",
 		"nette/utils": "^4.0"
 	},
 	"require-dev": {
diff --git a/readme.md b/readme.md
index 47b2f6d..d88b02a 100644
--- a/readme.md
+++ b/readme.md
@@ -20,7 +20,7 @@ Authentication & Authorization library for Nette.
 
 Documentation can be found on the [website](https://doc.nette.org/access-control).
 
-It requires PHP version 8.1 and supports PHP up to 8.3.
+It requires PHP version 8.1 and supports PHP up to 8.4.
 
 
 [Support Me](https://github.com/sponsors/dg)
diff --git a/src/Security/Permission.php b/src/Security/Permission.php
index 888e85a..5dab423 100644
--- a/src/Security/Permission.php
+++ b/src/Security/Permission.php
@@ -50,7 +50,7 @@ class Permission implements Authorizator
 	 * @throws Nette\InvalidArgumentException
 	 * @throws Nette\InvalidStateException
 	 */
-	public function addRole(string $role, string|array $parents = null): static
+	public function addRole(string $role, string|array|null $parents = null): static
 	{
 		$this->checkRole($role, exists: false);
 		if (isset($this->roles[$role])) {