diff --git a/composer.json b/composer.json
index 1305fbc1..e49f1c61 100644
--- a/composer.json
+++ b/composer.json
@@ -50,7 +50,8 @@
     "files": ["autoload.php"]
   },
   "require": {
-    "php": "^8.1"
+    "php": "^8.1",
+    "php-64bit": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^7|^8|^9",