If you are coming from an older version of Stardew Valley (like 1.4), updating to 1.5.4.2 unlocks the following major features:
: An entire new region featuring a volcano dungeon, new NPCs (Leo, Birdie), and a tropical farm area where you can grow any crop year-round.
: Resolved various gameplay bugs and rare crashes reported in previous 1.5 iterations.
: Fixed minor issues with the game's internal randomization logic. Core Content (What 1.5 Adds to Your Game)