diff --git a/composer.json b/composer.json
index 851ef09..d1d9297 100644
--- a/composer.json
+++ b/composer.json
@@ -11,6 +11,6 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=5.4.0"
+        "php": ">=5.6.0"
     }
 }