diff --git a/composer.json b/composer.json
index 4d872e15..61308865 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "license": "MIT",
     "require": {
         "php": ">=5.3.3",
-        "guzzle/parser": "3.0.*",
+        "guzzle/parser": "~2.8|~3.0",
         "react/socket": "0.3.*"
     },
     "autoload": {