Apple’s Safari 5.0.5 update is recommended for all Safari users and fixes all of the latest security issues. The update is compatible with any Mac running 10.5.8 or later (or Windows PC running XP or later) Snow Leopard’s Security Update 2011-002 also provides a variety of fixes. Both updates can be downloaded from Apple’s Support Website or via Software Update Software Update. The Snow Leopard Security Update is a mere 4.43MB in size, while the Safari update is 4.59MB.”]
Source: https://www.csoonline.com/article/2128088/apple-releases-safari–snow-leopard-security-updates.html