The transition from 4.1 to a further minor version is really simple, as very little has changed (I wrote an article about this, which, although written in Italian, is easy to understand and can be easily translated): PSADT: migrare facilmente da 4.1.5 a 4.1.7
However, a few things have changed between 4.0 and 4.1, so it's best to think carefully and migrate with caution.