diff --git a/composer.json b/composer.json
index 53a7f9d..b7c358e 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
 	},
 	"require-dev": {
 		"phpseclib/phpseclib": "^2.0",
-		"phpunit/phpunit": "^9.0"
+		"phpunit/phpunit": "^9.0 || ^12.0"
 	},
 	"autoload": {
 		"psr-4": {