diff --git a/composer.json b/composer.json
index b447a72..1d86846 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "wp-cli/wp-cli": "^2.12"
+        "wp-cli/wp-cli": "^2.13"
     },
     "require-dev": {
         "wp-cli/entity-command": "^2",
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
new file mode 100644
index 0000000..6fe826f
--- /dev/null
+++ b/phpstan.neon.dist
@@ -0,0 +1,13 @@
+parameters:
+  level: 9
+  paths:
+    - src
+    - server-command.php
+  scanDirectories:
+    - vendor/wp-cli/wp-cli/php
+  scanFiles:
+    - vendor/php-stubs/wordpress-stubs/wordpress-stubs.php
+  treatPhpDocTypesAsCertain: false
+  ignoreErrors:
+    - identifier: missingType.parameter
+    - identifier: missingType.return
diff --git a/src/Server_Command.php b/src/Server_Command.php
index e82a44c..7b37992 100644
--- a/src/Server_Command.php
+++ b/src/Server_Command.php
@@ -103,6 +103,7 @@ public function __invoke( $_, $assoc_args ) {
 			$options['bypass_shell'] = true;
 		}
 
+		// @phpstan-ignore argument.type
 		exit( proc_close( proc_open( $cmd, $descriptors, $pipes, null, null, $options ) ) );
 	}
 }