diff --git a/composer.json b/composer.json
index 79c92b52..657539f0 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
         }
     ],
     "require": {
-        "php": ">=5.0.0"
+        "php": ">=5.3.0"
     },
     "suggest": {
         "ext-mcrypt": "Install the Mcrypt extension in order to speed up a wide variety of cryptographic operations.",