diff --git a/composer.json b/composer.json
index 1788429..f87d8ac 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "library",
     "minimum-stability": "dev",
     "require": {
-        "php": "~5.6"
+        "php": ">=5.6"
     },
     "require-dev": {
         "phpunit/phpunit": "~5.2.0"