diff --git a/composer.json b/composer.json
index 83a4e49..5ef595f 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^9.0",
-    "yoast/phpunit-polyfills": "^2.0",
+    "yoast/phpunit-polyfills": "^4.0",
     "squizlabs/php_codesniffer": "^3.7",
     "wp-coding-standards/wpcs": "^3.3",
     "phpcsstandards/phpcsextra": "^1.5",