We might, but it takes millions of years so you wouldn't notice it in your lifetime. The evolutionary line that produced homo sapiens separated from the chimpanzee line ~7 million years ago. It took ~1 million years to begin to walk upright. It took another ~3 million years to learn to use tools, and another ~2.8 million years for homo sapiens to evolve. If you were around for 75 years during one of those intervals, you probably wouldn't notice any evolution happening - it would seem the same when you were born and when you died.