diff --git a/composer.json b/composer.json
index 9068f1c..c8012f2 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
   },
   "config": {
     "platform": {
-        "php": "8.0.0"
+        "php": "7.2.5"
     },
     "platform-check": true,
     "allow-plugins": {
@@ -46,6 +46,6 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.6"
+    "phpunit/phpunit": "^8.5"
   }
 }