use Phalcon \ Session \ Adapter \ Database as Database not found

Question

I need to update from PHP 7.3 to PHP 8.0 or PHP 8.1.

About composer.json php from ~ 7.3.0 to ^ 8.0, ext-phalcon from ^ 3.3.0 to 5.0.0 beta3 I think I have to update to

When I updated it, I found the following error. "Class "Phalcon\Session\Adapter" not found"

I was using the following on my existing system. use Phalcon \ Session \ Adapter \ Database as

I checked the following page https://docs.phalcon.io/4.0/ja-jp/upgrade

The following changes have been made. Removed Phalcon\Session\Adapter - replaced by Phalcon\Session\Adapter\AbstractAdapter

I tried the following, but the error still appeared.「"Class "Phalcon\Session\Adapter" not found"」 use Phalcon\Session\Adapter\Database as Database;

How can I solve it?