When was Cepheus Protocol last updated on Steam?

The last update for Cepheus Protocol on Steam (patch note or public build) was on Sep 4, 2026. The most recent developer announcement was posted on Sep 4, 2026.

How long has Cepheus Protocol been in Early Access?

Cepheus Protocol entered Steam Early Access on May 15, 2020 and has been in Early Access for 6 years 5 months (2351 days).

Will Cepheus Protocol leave Early Access?

The developer (Halcyon Winds) hasn't announced a confirmed 1.0 graduation date via structured Steam store metadata. Check the latest community announcements below for roadmap milestones.

Steam AppID #979640·Developer: Halcyon Winds·Publisher: Halcyon Winds

Is Cepheus Protocol Abandoned?

Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.

ActiveActivity Score: 79 / 100

Last checked: Oct 24, 2026 (UTC)

Developer? Correct this page

Stalled — developer posted on Sep 4, 2026, but no recorded game patch on Steam in over 12 months.

In Early Access

6 years 5 months

Since May 15, 2020

Current Players

—

Steam concurrent (no key)

Last Update

Sep 4, 2026

Patch or public build (lastShipAt)

Last developer post

Sep 4, 2026

Community announcement feed

Last Build Update

Not recorded

via steamcmd.net

Updates (Last 12m)

6 patches · 8 posts

Past 365 days

Steam Reviews

Very Positive (77%)

2,090 reviews

Why This Status? (Deterministic Signal Audit)

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Build timestamp via Steam PICS is unavailable; evaluated using official Steam announcements.
Shipped a game update 47 days ago (Sep 4, 2026).Signal Date: 2026-09-04
Last developer announcement posted on Sep 4, 2026 (47 days ago).Signal Date: 2026-09-04

36-Month Update Cadence Timeline

Monthly shipped patches vs. developer community posts for Cepheus Protocol (UTC)

Patches (6)Dev Posts (2)

Nov 23Nov 24Nov 25Oct 26

Recent Official Developer Announcements

Filtered strictly to official Steam Community Announcements (feed_type = 1), excluding third-party press articles.

Sep 4, 2026Update / Changelog

Read full post on Steam

2026.9.4 Experimental Patch Notes & September Development Update

Aug 21, 2026Update / Changelog

Read full post on Steam

2026.8.21.1 Experimental Patch Notes & August Development Update

Aug 13, 2026Update / Changelog

Read full post on Steam

2026.8.13.1 Now Out: Final Push to Escalation

Aug 5, 2026Update / Changelog

Read full post on Steam

2026.8.4.1 + 4.2 Experimental and Normal Patch Notes

Aug 1, 2026Update / Changelog

Read full post on Steam

2026.7.31.3 Quality of Life Update Live + GPU Fog of War Tonight on Experimental

Jul 28, 2026Update / Changelog

Read full post on Steam

2026.7.27 CERC OPS Arrives on Experimental Plus Major Fixes

Jul 24, 2026

Read full post on Steam

World Reveal of CERC Ops This Saturday!

Jul 20, 2026

Read full post on Steam

Massive Performance Gains and Smarter Fog of War Are Coming

Is Cepheus Protocol still being developed?

Cepheus Protocol’s last public Steam update was Sep 4, 2026. The developer’s latest Steam post was on Sep 4, 2026 (patch notes). To judge for yourself, see How to tell if an Early Access game is abandoned.

Frequently Asked Questions About Cepheus Protocol

Is Cepheus Protocol abandoned?: Based on public Steam records, Cepheus Protocol's last default-branch update was Sep 4, 2026. Our status only measures public Steam activity, not private development.
When was Cepheus Protocol last updated on Steam?: The last update for Cepheus Protocol on Steam (patch note or public build) was on Sep 4, 2026. The most recent developer announcement was posted on Sep 4, 2026.
How long has Cepheus Protocol been in Early Access?: Cepheus Protocol entered Steam Early Access on May 15, 2020 and has been in Early Access for 6 years 5 months (2351 days).
Will Cepheus Protocol leave Early Access?: The developer (Halcyon Winds) hasn't announced a confirmed 1.0 graduation date via structured Steam store metadata. Check the latest community announcements below for roadmap milestones.