As promised in September, Google has launched the 64-bit of the Chrome browser for Mac to the public after a few months in beta. According to Google’s original announcement, the update drops support for 32-bit extensions, requiring all developers to update with 64-bit support.
The update also fixes over 40 security flaws and adds many new APIs for extension developers. Chrome uses a silent update mechanism that will automatically download and install the latest update, but if you find that you’re still on version 38 in the “About Chrome” window, you can manually download and install the update from Google.