Can you tell me the exact version of OS X you are currently running, please?
Click the Apple logo in the menu bar at the top left of the screen
Select "About This Mac"
In the window that opens, look for the "Version" information. Please let me know what it says.
Next, repeatedly click on the word "Version" until it says "Serial Number” and provide that number, as well.
You are running the latest release of OS X 10.6 and it's likely you have the newest version of Safari still supported by that version of the operating system.
Going off the serial number, your Mac can support a slightly newer release of OSX (10.7) and that would allow you to upgrade to a more recent edition of Safari (though still not the newest).
... or you can download and use a newer release of the Firefox web browser as an alternative.
You are very welcome!
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