Minimum required version of PHP is 5.3.2.

composer.json

@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0"
+        "php": ">=5.3.2"
     },
     "suggest": {
         "ext-phpiredis": "Allows faster serialization and deserialization of the Redis protocol",