New areas
Confirmed in the announcement as part of a nautically themed expansion. No area has been named, shown or described beyond that theme.
Sources: Team Cherry announcement, 15 December 2025
Sea of Sorrow: Everything Team Cherry Has Announced
Sea of Sorrow is a free, nautically themed expansion for Hollow Knight: Silksong, announced by Team Cherry on 15 December 2025 for release in 2026. No date has been given. This page separates what was announced from what has been added since.
What the announcement actually promises
New bosses
Confirmed as a category. No individual boss has been named or shown. Anything circulating as a boss list is community speculation.
Sources: Team Cherry announcement, 15 December 2025
New tools
Confirmed as a category. Silksong's tools are Hornet's equippable items; which ones the expansion adds has not been stated.
Sources: Team Cherry announcement, 15 December 2025
"And more"
The announcement's own wording. It is not a content item, and it is where most third-party lists quietly start inventing.
Sources: Team Cherry announcement, 15 December 2025
On 15 December 2025 Team Cherry published a post on their own site announcing Hollow Knight: Silksong - Sea of Sorrow, a free expansion arriving in 2026. The relevant sentence is short: a nautically themed expansion bringing “new areas, bosses, tools, and more.”
That single line is the entire content description. Everything on this page is either that announcement, or an explicit statement that something is unknown.
When is Sea of Sorrow coming out?
Some time in 2026. No date has been announced, and it is not out yet.
That is the complete answer as of 11 August 2026, and it is worth being blunt about it because this is the question most people arrive here asking. Team Cherry gave a year. They did not give a month, a quarter, a season or a window within that year, and they have not added one since.
If you have seen a specific date attached to Sea of Sorrow, it did not come from Team Cherry. Dates in circulation are predictions, misread journal entries, or someone’s reading of how long the original Hollow Knight took between its content packs.
One concrete thing to watch: the expansion still has no Steam store page of its own — Silksong’s DLC list currently holds only the official soundtrack. If a store page appears quietly, that is likelier to be the first hard signal than any countdown. That last part is our expectation rather than anything Team Cherry has indicated.
Why the wording matters here
Coverage of this expansion has expanded the list. Read around and you will find NPCs, quests and secrets attributed to Sea of Sorrow with the same confidence as the areas and bosses. Those three do not appear in the announcement.
They may well turn out to be accurate — a Team Cherry expansion containing new NPCs would surprise nobody. But there is a difference between a reasonable expectation and something the developer said, and once that difference is lost it does not come back. This page keeps the two apart.
The same applies to platforms. The announcement names none. Silksong’s own Steam listing covers Windows, macOS and Linux, and the expansion arriving there is a fair assumption; the console lineups published elsewhere are not sourced to Team Cherry.
What was announced alongside it
The same post confirmed a Hollow Knight Nintendo Switch 2 Edition for 2026, free to existing Switch owners, adding high frame-rate modes, higher resolutions and additional graphical effects. It closed by noting further plans for 2026 being kept under wraps — a line frequently read as a hint about Fearless Fox, though the post draws no such connection.
What to watch for next
The most informative thing that could happen is quiet: a Steam store page appearing for the expansion. Silksong’s DLC list on Steam currently holds only the official soundtrack, so a second entry would be the first hard, machine-readable confirmation of platforms and timing.
Until then, the developer’s own site remains the only first-party source, and the honest summary of Sea of Sorrow is a short one — free, nautical, 2026, with new areas, bosses and tools.
For the question people ask most, see Sea of Sorrow bosses. For the studio’s track record on delivering post-launch content, see Team Cherry.
Release date tracker
Announced for 2026, no date given
Team Cherry announces the expansion on its own site with a 2026 window and no month, day or quarter. It is stated as free for all players.
Source: Team Cherry announcement, 15 December 2025
Still no date, and still no Steam page
Silksong's DLC list on Steam continues to hold only the official soundtrack. A Sea of Sorrow store page appearing there would be the first machine-readable confirmation of platforms and timing.
Source: Steam appdetails, appid 1030300
Last checked — no release date announced
Checked against Team Cherry's site and Silksong's Steam listing. Nothing has changed. This entry is updated whenever the page is re-verified, so a stale date here means the check is overdue, not that news was missed.
Frequently asked questions
When does Sea of Sorrow come out?
Team Cherry has committed only to 2026. The December 2025 announcement gives a year and no month, day or window within that year. Any specific date you see attributed to the expansion did not come from Team Cherry.
Is Sea of Sorrow free?
Yes. The announcement states it is coming free for all players. That is unusually clear compared with the rest of the post, and it matches how the original Hollow Knight handled its four post-launch content packs.
What platforms will it be on?
Team Cherry did not say. Several outlets have published a full platform lineup, but the announcement itself names no platforms. Silksong on Steam lists Windows, macOS and Linux, which is a reasonable starting expectation and not a statement about the expansion.
Does Sea of Sorrow have a Steam page yet?
Not as of August 2026. The only DLC listed against Silksong on Steam is the official soundtrack. That means Steam cannot currently corroborate anything about the expansion, and the developer's own announcement is the only first-party source.
How many new bosses are there?
Unknown. The announcement uses the plural and stops there. See the dedicated page on what is and is not known about the expansion's bosses.