---
title: Deployment
description: "Learn how to deploy out of sync stacks.\n[ implement - launch - live - apply - update - modify ]"
---

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# Deployment

## How to implement changes into your Ad Stack

Desynchronization happens when one of these items is modified:

- Ad units
- Integrations
- Context keys

When such changes are made, a "Push to production” banner will appear at the top of the interface.

![OOS\_banner](https://help.pubstack.io/hs-fs/hubfs/OOS_banner.png?width=688&height=96&name=OOS_banner.png)

The stacks using the modified items will enter an "out of sync" state. To update them you need to go to the *Sites* tab under *Ad Stack* and select one of the out of sync sites, shown by this icon in the “live stacks” column:

![OOS](https://help.pubstack.io/hs-fs/hubfs/OOS.png?width=178&height=105&name=OOS.png)Once a site is selected you can go to the *Stacks* tab and see its different versions.

To update the stack click the *sync* button (two spinning arrows).

![Deploy\_OOS](https://help.pubstack.io/hs-fs/hubfs/Deploy_OOS.png?width=620&height=322&name=Deploy_OOS.png)

Your stack will then be ready to deploy, allowing you to implement the changes.

To do so, click on the **deploy** button (right arrow) and select the percentage of deployment.

See: [A/B Testing with Ad Management](https://help.pubstack.io/a/b-testing-with-ad-management?hsLang=en)

The default is 100%, with which the updated stack will replace the out of sync stack.

If a stack is deployed 100%, all the other versions of that stack will be deleted.

For more information on how to create and edit stacks see: [Stacks](https://help.pubstack.io/stacks?hsLang=en)

- [What is Pubstack](https://help.pubstack.io/migration/what-is-pubstack?hsLang=en#main-content)

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    - [Pubstack UI Ad Management](https://help.pubstack.io/migration/ad-management-one?hsLang=en#pubstack-ui-ad-management)
    - [Use Cases](https://help.pubstack.io/migration/ad-management-one?hsLang=en#use-cases)
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- [Pubstack Node](https://help.pubstack.io/migration/pubstack-node?hsLang=en#main-content)

    - [Introduction](https://help.pubstack.io/migration/pubstack-node?hsLang=en#introduction)
    - [Getting Started](https://help.pubstack.io/migration/pubstack-node?hsLang=en#getting-started)
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