# Upgrading a lens in AWS WA Tool
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Lenses can be upgraded for workloads and review templates.

**Note**  
You can't undo a lens upgrade. After a workload or review template has been upgraded to the latest lens version, you can't go back to the previous version of the lens.

**Upgrading a lens for a workload**

1. On the **Notifications** page, select a workload to upgrade, and choose **Upgrade lens version**. Information about what changed in each pillar is displayed.
**Note**  
You can also choose **View available upgrades** from the workload **Overview** tab.

1. Before upgrading a lens for a workload, a milestone is created to save the state of your existing workload for future reference. Enter a unique name for the milestone in the **Milestone name** field.

1. Select the **Confirmation** box next to **I understand and accept these changes** and choose **Save**.

Once the lens is upgraded, you can view the previous version of the lens from the **Milestones** tab. 

**Upgrading a lens for a review template**

1. To upgrade the lens for a review template, choose

1. On the **Notifications** page, select a review template to upgrade, and choose **Upgrade lens version**. Information about what changed in each pillar is displayed.
**Note**  
You can also choose **View available upgrades** from the review template **Overview** tab.

1. Select the **Confirmation** box next to **I understand and accept these changes** and choose **Upgrade and edit template answers** to adjust answers to best practice questions for your review template, or **Upgrade** to upgrade the lens without adjusting your template answers.