At Bitnami we try to keep the applications we package up to date with their latests public versions.
At the time of writting this message, the latest version of Mattermost Community Edition is 4.1.0, and it is already available at: https://bitnami.com/stack/mattermost
Nevertheless, if you want to upgrade an old installed version of Bitnami Mattermost, you can follow the Bitnami documentation on how to upgrade Mattermost.
Hope it helps.
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