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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.
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In the left 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 For those that you don't recognize, or that are out-of-date, click Delete.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."