So i noticed 1.06$ difference in my bank account and i'm not quite sure where it came from.
Is it possible that an app that i purchased about a month ago i recently updated and it charged me a dollar?

lol yeah that's entirely possible.

either that or whenever you bought it, you had all of your settings and credit card info set to automatic and when you bought it you just didn't notice it costed a dollar.

in either case, it's just a dollar be worried if it becomes a pattern

"just a dollar' times thousands of people who use the app is quite a sum of money. I'd report it to the Apple Store if you can. The app makers might be guilty of fraud or something.