diff --git a/composer.json b/composer.json
index d5caa85..6ff35f6 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     ],
     "require": {
         "guzzlehttp/guzzle": "4.*",
-        "php": ">=5.5.0"
+        "php": ">=5.4.0"
     },
     "autoload": {
         "psr-4": {