diff --git a/composer.json b/composer.json
index 62487d6f..3a5cb268 100644
--- a/composer.json
+++ b/composer.json
@@ -49,7 +49,7 @@
 		"mediawiki/minus-x": "1.1.3",
 		"php-parallel-lint/php-console-highlighter": "1.0.0",
 		"php-parallel-lint/php-parallel-lint": "1.4.0",
-		"phpunit/phpunit": "9.6.16"
+		"phpunit/phpunit": "9.6.21"
 	},
 	"scripts": {
 		"test": [