[SOLVED] How to get instance of ContainerInterface instead of Slim instance?

I’m running UserFrosting 4.4.1 and getting the following error. Already ran composer update. Anything obvious I still need to do to avoid this error?

Controller::__construct() must be an instance of Interop\Container\ContainerInterface, instance of Slim\Container given, called in /var/www/html/UserFrosting/app/vendor/slim/slim/Slim/CallableResolver.php on line 102

Resolved by replacing this in all my files …

use Interop\Container\ContainerInterface

with these …

use Psr\Container\ContainerInterface;
use Psr\Container\ContainerExceptionInterface as ContainerException;