diff --git a/composer.json b/composer.json
index 9e06d1e..d6b7043 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9"
+        "php": ">=5.6.4"
     },
     "require-dev": {
         "mockery/mockery": "~0.9.4",