If these are truly repairs, then yes, definitely do it! Updates, however, are more subjective.
My recommendation would be to look at other properties in the price range you're hoping to sell yours for. And be brutally frank with yourself. Is the current condition of your home as good as those other properties? If the answer is no, then do the updates.
The benefit of updates in a buyers market is that your property would presumably go to the top of the list based on desirability. This is an important concern if you are looking to sell quickly.
I wouldn't be concerned with generating a higher sale price for the upgrades. Rather, if you can get your investment back and get your property sold quicker, then the upgrades are still a good investment.