diff --git a/composer.json b/composer.json
index 2c13f66..7f8b544 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "ext-memcache": "*"
   },
   "require-dev": {
-    "yoast/phpunit-polyfills": "^1.0",
+    "yoast/phpunit-polyfills": "^4.0",
     "phpunit/phpunit": "^9.5"
   },
   "config": {