Your gravatar isn't managed by SourceTree itself, instead it looks up your gravatar using your e-mail address. You're probably registered on www.gravatar.com. If you go here you can then change your gravatar based on the e-mail address used by the commits for your repository.
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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