Apple released its latest update to OS X Mavericks Thursday. Mavericks 10.9.3, which can be downloaded for free by clicking on the "check for updates" tab on your computer, has four key updates.    

The update include improved 4K display on late 2014 Mac Pros and MacBook Pro with 15-inch retina display, adds the ability to sync contact and calendars between a Mac and iOS device using a USB connection, improve the reliability of VPN connection using IPsec and includes the Safari update.     

According to MacRumors, Thursday's update also included the release of iTunes 11.2 and Safari 7.0.3. The Safari update is designed to fix security issues, fixes blocked push notification from websites, adds a perfect to run off push notifications, improve credit card auto fill and "fixes any issues that could cause the search and address field to load a webpage or send a search term before the return key is pressed.    

When Apple released OS X Mavericks last year, it marked on the more drastic new operating systems Apple had released because of changes to its designed and new features. However, it will more be known for being the first new operating system that has been released for free.     

"We are turning the industry on its ear," Apple CEO Tim Cook said last year. "We are doing it because we want our customers to have our latest software."

“Mavericks is an incredible release, which introduces significant new apps and features, while also improving the performance and battery life of your Mac,” said Craig Federighi, Apple’s senior vice president of Software Engineering, in a statement. “We want every Mac user to experience the latest features, the most advanced technologies, and the strongest security. We believe the best way to do this is to begin a new era of personal computing software where OS upgrades are free.”