diff --git a/composer.json b/composer.json
index 98b89956edd..3d09ca446ab 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
 		"ondrejmirtes/better-reflection": "6.21.0",
 		"phpstan/php-8-stubs": "0.3.82",
 		"phpstan/phpdoc-parser": "1.25.0",
-		"react/async": "^3",
+		"react/async": "^4",
 		"react/child-process": "^0.6.4",
 		"react/dns": "^1.10",
 		"react/event-loop": "^1.2",
diff --git a/composer.lock b/composer.lock
index 7b027f80eb8..e0564681dab 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "706757a900f56462c59454b6f4cb8436",
+    "content-hash": "fda45ab8c4022dab4d7b92bb19570e98",
     "packages": [
         {
             "name": "clue/ndjson-react",
@@ -2398,31 +2398,35 @@
         },
         {
             "name": "react/async",
-            "version": "v3.0.0",
+            "version": "v4.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/reactphp/async.git",
-                "reference": "3c3b812be77aec14bf8300b052ba589c9a5bc95b"
+                "reference": "7c3738e837b38c9513af44398b8c1b2b1be1fbbc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/async/zipball/3c3b812be77aec14bf8300b052ba589c9a5bc95b",
-                "reference": "3c3b812be77aec14bf8300b052ba589c9a5bc95b",
+                "url": "https://api.github.com/repos/reactphp/async/zipball/7c3738e837b38c9513af44398b8c1b2b1be1fbbc",
+                "reference": "7c3738e837b38c9513af44398b8c1b2b1be1fbbc",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1",
+                "php": ">=8.1",
                 "react/event-loop": "^1.2",
                 "react/promise": "^3.0 || ^2.8 || ^1.2.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^9.3 || ^7.5"
+                "phpstan/phpstan": "1.10.39",
+                "phpunit/phpunit": "^9.6"
             },
             "type": "library",
             "autoload": {
                 "files": [
                     "src/functions_include.php"
-                ]
+                ],
+                "psr-4": {
+                    "React\\Async\\": "src/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -2450,26 +2454,22 @@
                     "homepage": "https://cboden.dev/"
                 }
             ],
-            "description": "Async utilities for ReactPHP",
+            "description": "Async utilities and fibers for ReactPHP",
             "keywords": [
                 "async",
                 "reactphp"
             ],
             "support": {
                 "issues": "https://github.com/reactphp/async/issues",
-                "source": "https://github.com/reactphp/async/tree/v3.0.0"
+                "source": "https://github.com/reactphp/async/tree/v4.2.0"
             },
             "funding": [
                 {
-                    "url": "https://github.com/WyriHaximus",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/clue",
-                    "type": "github"
+                    "url": "https://opencollective.com/reactphp",
+                    "type": "open_collective"
                 }
             ],
-            "time": "2022-07-11T14:17:23+00:00"
+            "time": "2023-11-22T16:43:46+00:00"
         },
         {
             "name": "react/cache",