Sky changed their graphics in 2018, so not too long ago. BBC News's prior graphics were from 2013.
This is actually laughable! Sky´s package (core graphics, ToTH and lower thirds) is from May 2015! Nothing changed in 2018 except a lowercase logo and the addition of some title cards, weather map and press preview graphics, beside this all is in the same style than 2015. They even reverted back from new news wall graphics used in late 2017 to the old 2015 style in 2018. So actually even a step backwards !
I thought they had tweaked the lower thirds slightly, but you are right, they are pretty much the same as in 2015. And Sky News could do with a refresh. I don't actually watch it much these days, so they haven't outlived their welcome like the BBC News on-screen graphics did