diff --git a/composer.json b/composer.json
index 97a6f8b..bcff651 100644
--- a/composer.json
+++ b/composer.json
@@ -14,12 +14,19 @@
     "phpunit/phpunit": "^9.5",
     "react/event-loop": "^1.2",
     "react/promise": "^2.8",
-    "wyrihaximus/test-utilities": "^3.7.6"
+    "wyrihaximus/test-utilities": "^4 || ^3.7.6"
   },
   "require-dev": {
     "wyrihaximus/iterator-or-array-to-array": "^1.2"
   },
   "config": {
+    "allow-plugins": {
+      "composer/package-versions-deprecated": true,
+      "dealerdirect/phpcodesniffer-composer-installer": true,
+      "ergebnis/composer-normalize": true,
+      "icanhazstring/composer-unused": true,
+      "infection/extension-installer": true
+    },
     "platform": {
       "php": "7.4.7"
     },
diff --git a/composer.lock b/composer.lock
index dc70dac..8b8eddd 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": "47ab1b6a725076df2daed5863de788b3",
+    "content-hash": "702c46542825e6958574d9235c89390f",
     "packages": [
         {
             "name": "amphp/amp",
@@ -2627,9 +2627,6 @@
             "require": {
                 "php": "^7.1 || ^8.0"
             },
-            "replace": {
-                "myclabs/deep-copy": "self.version"
-            },
             "require-dev": {
                 "doctrine/collections": "^1.0",
                 "doctrine/common": "^2.6",
@@ -8703,5 +8700,5 @@
     "platform-overrides": {
         "php": "7.4.7"
     },
-    "plugin-api-version": "2.1.0"
+    "plugin-api-version": "2.2.0"
 }