diff --git a/composer.json b/composer.json
index 0be86d8..0a7e1e4 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0 || ^4.8.10",
-        "react/event-loop": "^0.4|^0.3",
+        "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3",
         "clue/stream-filter": "~1.2"
     },
     "suggest": {