diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 239bdc4d..58b8cf7c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,7 +7,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php: ['8.0', '8.1', '8.2']
+                php: ['8.0', '8.1', '8.2', '8.3']
 
             fail-fast: false
 
diff --git a/composer.json b/composer.json
index e8dda3c2..179e5835 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
 		}
 	],
 	"require": {
-		"php": ">=8.0 <8.3",
+		"php": ">=8.0 <8.4",
 		"nette/utils": "^3.2.9 || ^4.0"
 	},
 	"require-dev": {
diff --git a/readme.md b/readme.md
index 64463565..c3ea384d 100644
--- a/readme.md
+++ b/readme.md
@@ -846,7 +846,7 @@ echo $dumper->dump($var); // prints ['a', 'b', 123]
 Compatibility Table
 -------------------
 
-- PhpGenerator 4.0 is compatible with PHP 8.0 to 8.2
+- PhpGenerator 4.0 is compatible with PHP 8.0 to 8.3
 - PhpGenerator 3.6 is compatible with PHP 7.2 to 8.2
 - PhpGenerator 3.2 – 3.5 is compatible with PHP 7.1 to 8.0
 - PhpGenerator 3.1 is compatible with PHP 7.1 to 7.3