PS3 is still getting new firmware, with the latest download, 4.80, adding the usual stability improvements during use of certain features.
You can install the update by visiting Settings > System Update > Update via Internet on your PS4 if it doesn't prompt you to do install the latest firmware.
Are you still using the PS3? If so what is keeping you playing it? Are you still to upgrade to PS4 or Xbox One? if you haven't, then what's holding you back?
Let us know below.