diff --git a/composer.json b/composer.json
index 33360af1..7f65c86c 100644
--- a/composer.json
+++ b/composer.json
@@ -46,7 +46,8 @@
 		"sebastian/phpcpd"          : "3.0.1",
 		"squizlabs/php_codesniffer" : "3.3.2",
 		"phploc/phploc"             : "3.0.1",
-		"theseer/phpdox"            : "0.11.2"
+		"theseer/phpdox"            : "0.11.2",
+		"phpunit/php-invoker"       : "^2.0"
 	},
     "suggest": {
         "ext-bcmath": "*",