Old Java Version

Why does this happen? No matter what I do to revise the Minecraft Client, it reverts to Java 1.8.0_25 in the launcher settings. I'd like to get it revised to Java 1.8.0_111 because I've been having some crash issues. Actually, I'm using Launcher 1.6.67 but the "Affects Version/s" field above won't allow its entry.