Lay a sheet of news paper over the top. The paper probably won't fit tight enough on the top to wick water up.

You need a topper!

Favorite of my worms is burlap. I get free used coffee-bean bags from a local roaster, organic and free trade and shade grown. The more layers the better. It will also cool your worms like an evaporative cooler. Worms will hang out between layers of burlap and breed. It is like a moist-air cool sauna for squirm. I swear it can do wonders.

I also use used carpet and old blankets (after a stint in the dog house) as toppers. Carpet works great and last much longer than burlap.

Lots (8" or more) of moist cardboard, hay, straw, leaves, or compost also work well. Mulch the squirm with almost anything organic.

The key is the topper must BREATHE More or thicker is better.

When you feed just pull back the topper and lightly top feed only to prevent heat build-up.

Just for the case of low maintenance, in the bigger picture it doesn't matter to the worms if the top layer is a bit dry. As you dig down there will be more and more moisture until the worm are fine. In this case then, it's just the bedding on top won't be eaten for a while, maybe until you put food on top or mix it in giving it moisture. I seen a few vids where the top layer is quite dry.

No written rule that every part of the whole bin has to be worm perfect all the time. Not saying if you want to aim for this, that it's wrong. Just want to point it out as some folk have left or maybe never started a bin due to what seems like a lots of rules, work and delicate conditions.

Anyway on that note, the other suggestions work well. I've used similar before, currenlty using old VC that's not ideal, sprinkled on top to cover it a bit and give the VC a second runthough.

If you think about it, having the top layer dry more closely matches the worms natural environment. They'll stay down deeper out of the light and where it's moister.

Here is a link that might be useful: BorealWormer

it's not the fact that the top layer is dry but the fact at how fast a rate it has been drying i went from rung out sponge to dry within hours only on newspaper at the top layer and that is pretty fast to me to be drying out.

i will go get some burlap we have a bunch of sheets of it in the garage i can just cut a few and place ontop

Yeah, just place the wet burlap on top and you'll be fine. I wouldn't worry about how quickly the top layer dried out. The layer just under that won't dry out. I've been running one of my bins without a lid for a few weeks and the worms are thriving.