---
title: Upgrade EPiServer CMO with CMS 8
slug: cms-11/dev-docs/upgrading-episerver-cmo-with-cms-8
docTags: 
createdAt: 2026-07-22T19:45:20.632Z
---

## Prerequisites

It's recommended to upgrade the website to .NET Framework 4.5 and update NuGet packages to corresponding 7.5.x version:

- `EPiServer.CMS.Core` should be updated to 7.14 or later version.
- CMO should be updated to 7.5.446.2 or later version.

## Upgrade CMO

1. Run the following command to move the protected modules and add-ons (including CMO and Live Monitor) to a location in the `/modules/_protected` directory:
   `Move-EPiServerProtectedModules`
2. Update Optimizely Content Management System (CMS 8) platform and CMO by running the `Update-Package` commands. Make sure that you run the Update-Package EPiServer.Cmo first for correct update order:
   `Update-Package EPiServer.Cmo`
   `Update-Package EPiServer.Cms`
3. Update the CMS database to the latest version by running the following command:
   `Update-EPiDatabase`
4. Optional: Install the latest Live Monitor package. The EPiServer CMO does not have a direct dependency on Live Monitor. Live Monitor package for CMS 7.5 may be removed by NuGet when upgrading the CMO package to the latest version.
   `Install-Package EPiServer.LiveMonitor`
5. Optional: Configure Live Monitor and related components.
   Basically, you need to add assembly redirects for SignalR components and define `EPiServerLiveMonitorOWINStartup` as a startup value.
   This step is required only if you have the latest Live Monitor installed.
6. Rebuild the solution.