diff --git a/composer.json b/composer.json
index 9fdac8a..b002fd4 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   "require": {
     "php": "^8.2",
     "phpunit/phpunit": "^9.6.13",
-    "react/async": "^4.1.0",
+    "react/async": "^4.2.0",
     "react/event-loop": "^1.5.0",
     "react/promise": "^2.10 || ^3.0",
     "wyrihaximus/test-utilities": "^5.5.4 || ^6"
diff --git a/composer.lock b/composer.lock
index a676436..b3a0690 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": "1e5dacc70f4c43e32c28782906dbfa0f",
+    "content-hash": "71c72600e552e1152dafe3b4c96e49e8",
     "packages": [
         {
             "name": "amphp/amp",
@@ -5682,16 +5682,16 @@
         },
         {
             "name": "react/async",
-            "version": "v4.1.0",
+            "version": "v4.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/reactphp/async.git",
-                "reference": "b9641ac600b4b144e71a87dcf1be4d41dd3a3548"
+                "reference": "7c3738e837b38c9513af44398b8c1b2b1be1fbbc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/async/zipball/b9641ac600b4b144e71a87dcf1be4d41dd3a3548",
-                "reference": "b9641ac600b4b144e71a87dcf1be4d41dd3a3548",
+                "url": "https://api.github.com/repos/reactphp/async/zipball/7c3738e837b38c9513af44398b8c1b2b1be1fbbc",
+                "reference": "7c3738e837b38c9513af44398b8c1b2b1be1fbbc",
                 "shasum": ""
             },
             "require": {
@@ -5700,8 +5700,8 @@
                 "react/promise": "^3.0 || ^2.8 || ^1.2.1"
             },
             "require-dev": {
-                "phpstan/phpstan": "1.10.18",
-                "phpunit/phpunit": "^9.5"
+                "phpstan/phpstan": "1.10.39",
+                "phpunit/phpunit": "^9.6"
             },
             "type": "library",
             "autoload": {
@@ -5745,7 +5745,7 @@
             ],
             "support": {
                 "issues": "https://github.com/reactphp/async/issues",
-                "source": "https://github.com/reactphp/async/tree/v4.1.0"
+                "source": "https://github.com/reactphp/async/tree/v4.2.0"
             },
             "funding": [
                 {
@@ -5753,7 +5753,7 @@
                     "type": "open_collective"
                 }
             ],
-            "time": "2023-06-22T14:10:50+00:00"
+            "time": "2023-11-22T16:43:46+00:00"
         },
         {
             "name": "react/event-loop",