diff --git a/composer.json b/composer.json
index 332aed6..dcfc58b 100644
--- a/composer.json
+++ b/composer.json
@@ -30,6 +30,7 @@
     },
     "minimum-stability": "dev",
     "require-dev": {
+        "amphp/byte-stream": "dev-master as 0.1",
         "amphp/parallel": "dev-master as 0.1",
         "phpunit/phpunit": "^5.0",
         "friendsofphp/php-cs-fixer": "~1.9"