[–] His_Dudeliness 0 points 2 points 2 points (+2|-0) ago
Most of the other comments have actually answered this pretty much perfectly, I'll just try to expand and explain a little bit more. Firstly, apes didn't evolve to humans. Apes are actually our cousins, we evolved from the same ancestor. Now to actually answer your question, they do. Not only are apes evolving but every living thing on the planet is evolving. It's just a really really really slow process, so we it's hard to observe.
Aside from the fact more evolution will take another set of a few million years, conditions for evolution could be different for the apes. Things such as natural selection, reproductive isolation, and preferred traits in mating can all affect how they evolve and change to best fit these categories.
[–] tacowhisperer ago
All living species are evolving because of random genetic differences and mutations that occur when two parents have children. The thing is that the process is extremely slow to see occur naturally in a wide range of animals, including apes.
[–] Genghis_Khan ago
Not a biologist, but something tells me the "apes" humans evolved from are not the apes we see today. Consider that today's apes also evolved from their (our?) ancestor.
[–] an_instance 0 points 7 points 7 points (+7|-0) ago
They do and they have. Humans didn't evolve from modern apes. We all evolved from a common ancestor.