diff --git a/composer.json b/composer.json
index 93f0cda..9fd5e42 100644
--- a/composer.json
+++ b/composer.json
@@ -13,8 +13,7 @@
     "ext-mbstring": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^4.8",
-    "react/promise": "^2.4"
+    "phpunit/phpunit": "^4.8"
   },
   "config": {
     "bin-dir": "bin"
@@ -33,6 +32,6 @@
     }
   },
   "suggest": {
-    "react/promise": "To use ReactPhp promise adapter"
+    "react/promise": "To use ReactPHP promise adapter"
   }
 }