Bundle requires Core, which has dev dependencies

[mp3tk0v]

You need a total of 2 Classes from the CoreBundle, which can't be installed unless you cascade your requirements to dev on your whole project.

use CampaignChain\CoreBundle\Bundle\DependencyInjection\Extension;
use CampaignChain\CoreBundle\Util\VariableUtil;

If you have access to these 2 classes in your Update bundle, then it would be fully functional on its own. Right now its not really usable unless you compromise the stability of your project.

[mp3tk0v]

Looked a bit further down the code in an attempt to suggest a solution. There are more dependencies, tho it seems for the most part these 2 classes are the major errors for usage as a stand alone.