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To get the most latest version of Safari, you will have to upgrade the OS X from 10.7.5 Lion to Mac OS X 10.11 El Capitan. El Capitan is the latest version of OS X that released last month.
To install the El Capitan update, please follow the steps below;
In Finder, click on the Go menu at the top bar and select Applications. This will open the Applications folder. Then open the App Store application. In App Store. you wil see El Capitan there. Click Download. It is a big file, so it would take a while to complete the download. Once the download is completed, it will prompt you to install. So just follow the onscreen instructions to install it.
If you have any difficulty on following the steps above, please let me know by replying in here.