diff --git a/composer.json b/composer.json
index 44cc9ec5..1f907119 100644
--- a/composer.json
+++ b/composer.json
@@ -33,6 +33,7 @@
         }
     ],
     "require":{
+        "php": ">=5.3.2"
     },
     "require-dev":{
         "phpunit/phpunit":"*",