Rare Ltd announced the launch of Season 20 for Sea of Thieves, marking the final major update before the introduction of Custom Seas.
This transition represents a pivotal shift in the game's lifecycle as developers prepare the infrastructure for player-driven environments. By prioritizing game health and stability now, the studio aims to ensure the upcoming custom functionality operates without significant technical friction.
The development team said the update via a post on X, formerly known as Twitter [1]. This latest iteration focuses on three primary areas: the addition of new cosmetics, general health improvements, and the implementation of additional tools [1]. These updates are designed to refine the current user experience while laying the groundwork for the more complex Custom Seas feature [1].
Season 20 [1] serves as a bridge between the established game loop and a more open-ended creative phase. The focus on "health improvements" suggests a period of optimization to resolve existing bugs or performance issues before the game introduces the ability for users to define their own seas [1].
While specific details on the Custom Seas tools remain limited, the studio said this update is the definitive final step in the current development trajectory [1]. The integration of new cosmetics ensures that the visual progression of the game continues to evolve alongside the technical updates [1].
“The final major update before the Custom Seas feature”
The move toward Custom Seas indicates a strategic shift from developer-led content updates to user-generated content. By releasing a final major traditional update in Season 20, Rare Ltd is likely stabilizing the engine to prevent the systemic instability that often accompanies deep customization tools in sandbox environments.




