diff --git a/composer.json b/composer.json
index 0cdd7eb..5816e50 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "php": "> 5.6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "9.6.10",
+    "phpunit/phpunit": "9.6.33",
     "wp-coding-standards/wpcs": "dev-master"
   },
   "license": "GPL-2.0+",