diff --git a/composer.json b/composer.json
index 66ce0a6..e302a65 100755
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
         }
     ],
     "require": {
+        "php": ">=5.3.0",
         "guzzle/guzzle": "3.8.*",
         "lstrojny/fxmlrpc": "0.8.*"
     },