A new version of Chrome fixes a single security bug. Chrome 74.0.3729.157 was announced and made available on May 14, so it may have already found its way to your computer by way of Google’s rather insistent update mechanisms.
If you’re not sure which version of Chrome you’re running, click that little ‘three vertical dots’ menu button at the top right, and navigate to
About Google Chrome. Besides showing you the version of your current installation, this will usually prompt Chrome to check for available updates and offer to install a new version.