diff --git a/composer.json b/composer.json
index 225064e..f91307d 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
         "psr-4": { "Omnipay\\FirstData\\" : "src/" }
     },
     "require": {
-        "php": "^5.6|^7",
+        "php": "^7.3|^8.0,
         "omnipay/common": "~3.0",
         "php-http/guzzle6-adapter": "^1.1"
     },