diff --git a/composer.json b/composer.json
index 86437a3..dcb3370 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "react/promise": "^3.2"
     },
     "require-dev": {
-        "wyrihaximus/async-test-utilities": "^9.4.2",
+        "wyrihaximus/async-test-utilities": "^10.4.0",
         "wyrihaximus/makefiles": "^0.5.0"
     },
     "autoload": {