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On your GitHub Enterprise Server instance, navigate to the main page of the repository.
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.
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In the "Security" section of the sidebar, click Deploy keys.
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On the "Deploy keys" page, take note of the deploy keys associated with your account. For those that you don't recognize, or that are out of date, click Delete. If there are valid deploy keys you'd like to keep, click Approve.
For more information, see "Managing deploy keys."