diff --git a/composer.json b/composer.json
index 151de4b..0b80c51 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     },
     "require": {
         "php": ">=5.4.0",
-        "guzzle/guzzle": "3.9.*"
+        "guzzle/guzzle": ">=3.7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*"