---
title: "Step 11. Begin Upgrade"
description: "At the Ready to Upgrade step of the wizard, click Upgrade to begin the upgrade process. If you installed Veeam ONE using the custom installation, repeat this upgrade procedure on every machine where the Veeam ONE components are installed."
canonical: "https://helpcenter.veeam.com/docs/one/userguide/upgrade_begin.html"
breadcrumb: "User Guide > Installing Veeam ONE > Upgrading to Veeam ONE 13 > Step 11. Begin Upgrade"
dateModified: "2026-10-23"
---

# Step 11. Begin Upgrade

At the **Ready to Upgrade** step of the wizard, click **Upgrade** to begin the upgrade process.

[![Begin Upgrade](images/upgrade_ready.png "Begin Upgrade")](images/upgrade_ready.png){.toggle}

If you installed Veeam ONE using the custom installation, repeat this upgrade procedure on every machine where the Veeam ONE components are installed.

Depending on the size of the Veeam ONE database, the upgrade procedure may take up to several hours.