diff --git a/composer.json b/composer.json
index 25e7619..47d47cc 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
   "name": "avangate/avangate-php-rest-api-client",
   "license": "MIT",
   "require": {
-    "php": "^5.6",
+    "php": ">=5.6",
     "guzzlehttp/guzzle": "6.*"
   },
   "autoload": {