I'm giving this a try:
```lang=php
<?php
require_once dirname(__FILE__).'/scripts/__init_script__.php';
$yelirekim = (new PhabricatorPeopleQuery)
->setViewer(PhabricatorUser::getOmnipotentUser())
->withUsernames(['yelirekim'])
->executeOne();
$thing = (new ConduitCall('differential.updaterevision', [
'id' => 15,
'diffid' => 24,
'fields' => [
'phabricator:depends-on' => ['PHID-DREV-ovtaojecgkoims6zrui5'],
],
]))
->setUser($yelirekim)
->execute();
var_dump($thing);
```
The call doesn't error out, but it's not actually updating anything either.