diff --git a/composer.json b/composer.json
index 63edb3e..c947d06 100644
--- a/composer.json
+++ b/composer.json
@@ -43,7 +43,7 @@
   "require-dev": {
     "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
     "php-stubs/wp-cli-stubs": "^2.4",
-    "phpunit/phpunit": "^7.5.20",
+    "phpunit/phpunit": "^8.5.37",
     "szepeviktor/phpstan-wordpress": "^1.1",
     "wearerequired/coding-standards": "^3.0",
     "wp-cli/extension-command": "^2.0",