diff --git a/composer.json b/composer.json
index d977351..eff94c2 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "9.*",
-    "yoast/phpunit-polyfills": "2.*",
+    "yoast/phpunit-polyfills": "4.*",
     "squizlabs/php_codesniffer": "3.*",
     "wp-coding-standards/wpcs": "3.*",
     "phpcsstandards/phpcsextra": "1.*",