The release announcement for Chrome 73.0.3683.75 links to a list of sixty security issues which are fixed in the new version.

Many of the vulnerabilities addressed in Chrome 73.0.3683.75 were discovered by external security researchers, once again demonstrating the value of Google’s open attitude towards bug submissions.

Although Chrome usually updates itself within a few days of a new release, you can expedite this process by checking for available updates. Do that by navigating Chrome’s three-dot menu (by default at the top right), to Help > About Google Chrome. This will trigger an update, if one is available.