Proton Pass on Mac doesn't have a feature to check for updates, nor does it update itself when a new version is available. The only way I know there's an update is to use a third-party app that shows an update is available for Proton Pass. I talked to Proton Pass support, and they stated, 'Please note that, unfortunately, there is no check for the update button. You will have to download the latest version from the download page.' A password manager has significant security implications; if an update is available, the user shouldn't have to guess to find it.