diff --git a/composer.json b/composer.json
index 7e1c24c..7c2eee3 100644
--- a/composer.json
+++ b/composer.json
@@ -10,14 +10,15 @@
     "wp-cli/wp-cli": "^2.12"
   },
   "require-dev": {
-    "wp-cli/wp-cli-tests": "^4"
+    "wp-cli/wp-cli-tests": "^5"
   },
   "config": {
     "process-timeout": 7200,
     "sort-packages": true,
     "allow-plugins": {
       "dealerdirect/phpcodesniffer-composer-installer": true,
-      "johnpbloch/wordpress-core-installer": true
+      "johnpbloch/wordpress-core-installer": true,
+      "phpstan/extension-installer": true
     }
   },
   "extra": {
@@ -57,12 +58,14 @@
     "behat-rerun": "rerun-behat-tests",
     "lint": "run-linter-tests",
     "phpcs": "run-phpcs-tests",
+    "phpstan": "run-phpstan-tests",
     "phpcbf": "run-phpcbf-cleanup",
     "phpunit": "run-php-unit-tests",
     "prepare-tests": "install-package-tests",
     "test": [
       "@lint",
       "@phpcs",
+      "@phpstan",
       "@phpunit",
       "@behat"
     ]