diff --git a/composer.json b/composer.json
index 337a196..f234c1a 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     "moneyphp/money": "^4.7.0",
     "react-parallel/event-loop": "^2.1.0",
     "react-parallel/infinite-pool": "^3.1.0",
-    "react-parallel/pool-tests": "^5.1.0",
+    "react-parallel/pool-tests": "^5.1.0 || ^6.0.0",
     "react-parallel/stubs": "^1.2.0",
     "wyrihaximus/async-test-utilities": "^10.5.0",
     "wyrihaximus/makefiles": "^0.7.15"