Two new versions of Opera were released recently. The first, Opera 63.0.3368.88, includes security fixes and crash fixes. The release announcement doesn’t mention the vulnerabilities addressed in 63.0.3368.88, and neither does the change log, which is annoying. Presumably it’s left as an exercise for the user to research vulnerabilities in Opera, as documented on sites like Mitre.
The second new version, Opera 63.0.3368.94, sports a new version of the Chromium engine and more crash fixes. Again, there’s not much to learn from the release announcement or change log.
To check the version of Opera you’re running and install any available new version, click Opera’s menu button (the big ‘O’ at the top left usually) and navigate to Update & Recovery…