diff --git a/composer.json b/composer.json
index 744707b..62b5cf4 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     }
   ],
   "require": {
-    "php": "^5.3|^7.0"
+    "php": "^5.6|^7.0"
   },
   "require-dev": {
       "phpunit/phpunit": "4.0.*",