diff --git a/composer.json b/composer.json
index 212074c..2094241 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": "^7.0",
+        "php": ">=5.6",
         "composer-plugin-api": "^1.1"
     },
     "require-dev": {