Hi guys! Since 2013 I own a 13" rMBP (2.8 i7, 16GB, 512GB SSD). Apart from the battery, which I will have replaced at an Apple Store within the next months (the capacity dropped to about 65% by now, after over 1100 cycles), I am still very happy with its functionality and performance. And USB ports. It came with Mavericks installed, which I thought was a very good system indeed. Two years ago I decided to bite the bullet and pulled the trigger on an update to El Capitan. While it was not the latest version back then, it sounded like the most suited for this 3-years-old machine. Now I am starting to ponder if an update to a newer OS version could be something. I do not care much about additional features like Siri or Dark Mode, but I am starting to have issues with Safari on many webpages and sometimes with software that does not support El Capitan anymore. Would you recommend an update to a more modern version of MacOS and, if so, which would be the most solid release for this aging machine? Thanks!