diff --git a/composer.json b/composer.json
index a355af8..7c18136 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
 
 	},
 	"require-dev": {
-		"phpseclib/phpseclib": "^2.0",
+		"phpseclib/phpseclib": "^2.0 || ^4.0",
 		"phpunit/phpunit": "^9.0"
 	},
 	"autoload": {