diff --git a/php/composer.json b/php/composer.json
index c543c802..5ad785cc 100644
--- a/php/composer.json
+++ b/php/composer.json
@@ -5,6 +5,7 @@
         }
     },
     "require": {
+        "php": "^8.0",
         "ext-json": "*",
         "ext-sodium": "*",
         "ext-curl": "*",