diff --git a/composer.json b/composer.json
index 47f3bf9..cb271c4 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "wyrihaximus/metrics": "^1.0 || ^2"
     },
     "require-dev": {
-        "wyrihaximus/async-test-utilities": "^7.2 || ^5"
+        "wyrihaximus/async-test-utilities": "^7.2 || ^5 || ^8"
     },
     "autoload": {
         "psr-4": {