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| Published | Title | Build |
|---|---|---|
| Hotfix 0.30.4c Patch Notes Bugfix: When running in developer mode, mods that add new ship classes would crash the game during loading with a "cannot be used in the demo" error. (This bug was introduced in yesterday's 0.30.4b hotfix.) | 23161854 | |
| Hotfix 0.30.4b Patch Notes Possible fix for rare, random crashes during gameplay. Attention Linux Players: We're aware that many of you are experiencing random and often frequent freezes/crashes since the 0.30.4 update. We're currently in communications with the Proton team about these, and they need your Proton log files in order to investigate the issue. Please see this FAQ about how to turn on and find the Proton log… | — | |
| Hotfix 0.30.4a Patch Notes Bugfix: The game would sometimes load forever while jumping to a new star system. · When updating an existing Steam Workshop item, the name, description, and preview image will no longer be updated unless you specially check a box to do so. | 22875187 | |
| Update 0.30.4 - Ironman Mode, Balance Changes, New Ships, & Bug Fixesmajor Cosmoteer update 0.30.4 is now available! This is a small update that adds "Ironman Mode" to Career, adds new ships, improves balance, and fixes bugs. Enjoy! Patch Notes: · Balance: · Small Shield (Overclocked): · 'Extended' health reduced (15000->12000) · 'Reinforced' health increased (30000->39000) · Flak (Overclocked): · Reduced shrapnel cloud health (800->400) · Reduced shrapnel cloud lifet… | 22841641 | |
| Release Candidate 0.30.4 - Ironman Mode, Balance Changes, New Ships, & Bug Fixes Cosmoteer release candidate 0.30.4 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate adds "Ironman Mode" to Career, adds new ships, improves balance, and fixes bugs. Thanks for testing! RC1 Patch Notes: · Balance: · Small Shield (Overclocked): · 'Extended' health red… | 22745663 | |
| Hotfix 0.30.3d Patch Notes Bugfix: In single-player, detonating an Explosive Charge while hovering another part would crash the game. | — | |
| Hotfix 0.30.3c Patch Notes Crash when overclocked shields receive negative damage. · Possible freeze when placing parts that change heat build stats. · Explosions that split ships could cause common multiplayer desyncs and inconsistent damage. | — | |
| Hotfix 0.30.3b Patch Notes Bugfix: Mods whose <mod.rules>/Actions list used inheritance would usually crash on load. | — | |
| Hotfix 0.30.3a Patch Notes Bugfix: Crash when booting the game on a computer that doesn't have a settings file saved yet. | 21202141 | |
| Update 0.30.3 - Quality-of-Life, Balance, & Bug Fixesmajor Cosmoteer update 0.30.3 is now available! This is a small update that makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs. Enjoy! Patch Notes: · Built-In Ships: · Added 4 new Fringe combat ships: Hotshot, Scorcher, Smoulderer, and Stoker. · Added 11 new Cabal combat ships: Adustio, Antares, Heliogabalus, Helios, Ignis Castus, Ignis Excaecator, Ignis Immanis, Ign… | 21198132 | |
| Release Candidate 0.30.3 - Quality-of-Life, Balance, & Bug Fixes Cosmoteer release candidate 0.30.3 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs. Thanks for testing! RC1 Patch Notes: · Built-In Ships: · Added 4 new Fringe combat ships: Hotsho… | 20987734 | |
| Hotfix 0.30.2b Patch Notes Fixed overclocked railgun splitting projectiles causing lag/stutter. | — | |
| Hotfix 0.30.2a Patch Notes Fixed frequent desyncs during gameplay, especially during ship construction. | — | |
| Update 0.30.2 - Quality of Life & Bug Fixesmajor Cosmoteer update 0.30.2 is now available! This update tweaks the new sound effects in response to player feedback (thanks!!), makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs. Enjoy! Patch Notes: · Built-In Ships: · Added 20 new Great House Io combat ships: Aamon, Amy, Ananke, Andrealphus, Caligaris, Cetus, Charybdis, Clio, Decarabia, Furfur, Ianthe, Janus, L… | 20685700 | |
| Release Candidate 0.30.2 - Quality-of-Life & Bug Fixes Cosmoteer release candidate 0.30.2 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This is a release candidate tweaks the new sound effects in response to player feedback (thanks!!), makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs. Thanks for testing!… | 20443512 | |
| Hotfix 0.30.1b Patch Notes Modding: Re-added the 'ElementDeliver' common sound effects, because its removal was causing mods to crash. · Bugfix: Rare crash when opening the galaxy map with some galaxy seeds. | 19992395 | |
| Hotfix 0.30.1a Patch Notes Fixed an issue causing incompatibility with some mods. | 19918928 | |
| Update 0.30.1 - New Sound Effects & More!major Cosmoteer update 0.30.1 is now available! This update has new audio effects, new ships, balance tweaks, quality-of-life improvements, and bug fixes. Enjoy! Patch Notes: · Built-In Ships: · Added 2 new Monolith combat ships: Justicar, Perfect Blue. · Added 3 new Cabal ships: Delphinus, Lyra Major, Lyra Minor. · Added 2 new Imperium combat ships: Canary, Nero. · Added 25 new Great House Io combat… | 19918348 | |
| Hotfix 0.30.0e Patch Notes Bugfix: Missile Launchers set to any type other than H.E. would lose their loaded missile parts after loading a saved game. · Bugfix: Overclocked Deck Cannons had their reload timers reset after loading a saved game. | 19817698 | |
| Release Candidate 0.30.1 - New Sound Effects & Quality-of-Life Cosmoteer release candidate 0.30.1 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This is a release candidate contains a ton new sound effects, plus it's got a handful of the usual assortment of new ships, balance tweaks, quality-of-life improvements, and bug fixes. Thanks for testing!… | 19704367 | |
| Hotfix 0.30.0d Patch Notes Saved game files containing ships that were under construction and had overclocked parts could sometimes fail to load. · Mod files with names in the format 'mod_*.rules' will no longer be considered if they don't contain a 'CompatibleGameVersions'. | 19692228 | |
| Hotfix 0.30.0c Patch Notes Mod authors can now simultaneously support multiple versions of Cosmoteer within a single mod package. To do so, the mod author should add additional 'mod.rules' or 'mod_*.rules' files, optionally inside sub-folders if desired. Cosmoteer will then look at the 'CompatibleGameVersions` listed in each file and automatically select the one that best matches the current game version. (This functiona… | 19677041 | |
| Hotfix 0.30.0b Patch Notes Reduced the chance of full-size fire spreading per-tick from 40% to 15%. · Reduced the time it takes a full-size fire to scorch a part from 40 seconds to 25. · Updates/fixes to all language translations. · Updates/fixes to several Great House Io ships and stations. · The decal icon_nuclear is now properly centered. · (Bugfix): When playing on PCs set to certain languages (such as Turkish), game… | 19561954 | |
| Hotfix 0.30.0a Patch Notes This is a small patch to fix a handful of issues in the recent "Meltdown Update". · The Thermal Resonance Lance's heat blast on destruction is now scaled by how much heat is in its storage. · Ammo Factories and H.E. Factories now have a chance of starting fires when destroyed. · Factory production animations now get faster when the factory has a speed buff. · Toggling off the U.I. (default Ctrl… | 19486787 | |
| COSMOTEER: THE MELTDOWN UPDATE IS HERE!major The Biggest Cosmoteer Update Yet Greetings, Cosmoteers! I'm Walt, the creator of Cosmoteer, and I'm here to tell you that The Meltdown Update , our biggest update ever, is now live! This massive update introduces an entirely new gameplay mechanic for both ship design and combat: heat management. Check out the trailer! Heat: The Thermal Battlefield The Meltdown Update is all about heat: both man… | 19414108 |
| Date | Day | Time | Patch title | Build ID | Branch | Depots | Download Δ |
|---|---|---|---|---|---|---|---|
| 9 May 2026 | Sat | 18:18 | Hotfix 0.30.4c Patch Notes | 23161854 | public | 3 | — |
| 9 May 2026 | Sat | 18:18 | Hotfix 0.30.4c Patch Notes | 23161854 | 0.30.4 | 3 | — |
| 9 May 2026 | Sat | 18:17 | Hotfix 0.30.4c Patch Notes | 23161854 | unstable | 3 | — |
| 20 Apr 2026 | Mon | 22:18 | Hotfix 0.30.4a Patch Notes | 22875187 | previous-build | 3 | — |
| 20 Mar 2026 | Fri | 22:13 | No patch notes · unannounced build | 21875348 | 0.30.3 | 3 | — |
| 16 Dec 2025 | Tue | 03:57 | No patch notes · unannounced build | 20774453 | 0.30.2 | 3 | — |
| 6 Nov 2025 | Thu | 02:37 | Hotfix 0.30.1b Patch Notes | 19992395 | 0.30.1 | 3 | — |
| 5 Nov 2025 | Wed | 00:26 | No patch notes · unannounced build | 16072530 | 0.27.2 | 3 | — |