In order to update your server add-on, please follow the below steps:
1. Login to JIRA using an Administrator account
2. Search for the “Settings” symbol in the top right corner
3. In the “JIRA Administrator” section click on “Add-ons”
4. A new screen will be loaded. Click on “Manage Add-ons” in the left Menu panel
5. Find Outlook To JIRA add-on and click on Update