diff --git a/composer.json b/composer.json
index 81c6d54..2edd768 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "laminas/laminas-view": "^2.28"
   },
   "require-dev": {
-    "iteaoffice/testing": "^v3.5",
+    "iteaoffice/testing": "^v3.5 || ^4.0",
     "rector/rector": "~0.15"
   },
   "config": {