Google has rolled out the new Chrome 33 browser for Windows, Mac and Linux, which comes with 28 security patches.

Of the overall vulnerabilities, five were rated ‘high,’, three of them being classified as ‘use-after-free’ issues, which is a kind of memory bug that in-house and external researchers have become skilled at wiping it out.

Google also rewarded seven outside researchers with a total of $13,500 in bounties for reporting nine of the overall patched 28 security vulnerabilities, bringing the overall awarded bounties to more than $21,000 this year.

Chrome 33 comes with the latest Adobe’s Flash Player version, while also provides notifications for the Siri-like Google Now digital assistant within the browser on Windows and Apple’s OS X.

In January, Google challenged Chrome hackers with whopping $2.7m bounty if they were able to crack the security of Chrome operating system at the upcoming Pwnium 4 hacking contest to be held this month.