diff --git a/.gitignore b/.gitignore
index bcf211b3..9d9a0395 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 wp-cli.local.yml
 node_modules/
 vendor/
+build/
 *.zip
 *.tar.gz
 composer.lock
diff --git a/composer.json b/composer.json
index e631b5c9..5de639c2 100644
--- a/composer.json
+++ b/composer.json
@@ -16,14 +16,15 @@
     },
     "require-dev": {
         "wp-cli/entity-command": "^1.3 || ^2",
-        "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
         },
         "lock": false
     },
@@ -54,12 +55,14 @@
         "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"
         ]