Patch history

1. Jun 8, 2026·Update 1.6.4850 released

   • ≈🐛Bug fixperformance

     Resolved performance issues related to large numbers of unbuildable blueprints and scenarios with no home map but multiple non-home maps.

     Fixed performance issues with unbuildable blueprints and specific map configurations.

   • ≈🛠QoLUI

     Rectangle drag designators now correctly display the number of cells in the dragged rectangle rather than the total on screen.

     Fixed rectangle drag designator cell count display.

2. Aug 6, 2025·Update 1.6.4543 released+2

   • ▲🐛Bug fixVacuum resistance caching

     Vacuum resistance stat is now cached, resolving significant performance issues when many blueprints are on the map.

     Performance fix

   • ▲🎯BehaviorDormant mechsBlocking→Non-blocking

     Dormant mechs no longer block pawn paths, improving colony movement.

     Pathing fix

   • ≈🎯BehaviorTrader's Guild

     Allowed the trader's guild faction to generate more variety in their ideoligion.

     Ideoligion variety

   • ≈🎯BehaviorArchean treesTerraform ice→No terraform

     Archean trees no longer terraform ice.

     Terraforming fix

3. Jul 29, 2025·Update 1.6.4535 released

   • ≈🛠QoLstartup performance

     Fixed slow startup performance (InitializeShortHashDictionary) when using a large number of mods.

     Faster load with mods.

   • ≈🎯Behavioroutfit standsUninstallable→Non-uninstallable

     Prevented outfit stands from being uninstalled to avoid destroying their inventory when deconstructed while minified.

     Prevents inventory loss.

4. Jul 22, 2025·Update 1.6.4528 released+1

   • ≈🛠QoLmemory usage—→Reduced

     Overall reduction in memory usage and improved load times on Mac.

     quality

   • ▲🐛Bug fixSwimmingsoaking wet thought-3→Removed

     Removed the -3 soaking wet thought when swimming for recreation.

     bugfix

   • ≈🐛Bug fixworld map performanceSlow→Fixed

     Fixed significant performance drops when the world map or terrain tab is open.

     bugfix

5. May 24, 2024·Update 1.5.4104 released+1

   • ≈🛠QoLrender node worker

     Adjusted render node worker to support multiple graphics per node without dirtying the render tree.

     quality

   • ▲✂️Removedresurrectioncoma→Removed

     Removed the deathless regeneration coma upon resurrection.

     removed

   • ≈✂️Removedanimal operationshealer mech serums→Removed

     Removed healer mech serums from animal operation options.

     removed

   • ≈🐛Bug fixline of sight—→Fixed

     Fixed beam verbs and incinerators hitting cells without a clear line of sight.

     bugfix

6. Apr 19, 2023·Update 1.4.3704 released

   • ≈🐛Bug fixgraphics

     Fixed magenta square fetus graphics appearing during reloading.

     bugfix

   • ≈🐛Bug fixcorpse destruction

     Fixed an error occurring on corpse destruction when completedObligations was null.

     bugfix

7. Mar 28, 2023·Update 1.4.3682 released

   • ≈🎯Behaviorbestowing ceremony

     The bestowing ceremony lord is now removed once the last pawn has left the map.

     Cleanup

   • ≈🐛Bug fixshield belt

     Fixed an error occurring when a shield belt on the ground was hit by an EMP explosion.

     EMP fix

   • ≈🐛Bug fixpollution overlay

     Pollution overlay grid now correctly updates after cell-filling buildings are destroyed.

     Visual fix

8. Feb 15, 2023·Update 1.4.3641 released+3

   • ▲🎯BehaviorBetrayal Questsfailure conditionany refugee joins→all surviving refugees join

     Betrayal quests now only fail once all surviving refugees have joined the faction, rather than just any single one.

     behavior

   • ▲🐛Bug fixFabricorsmedicine productionbroken→working

     Fixed a bug preventing Fabricors from producing medicine.

     bugfix

   • ▲🐛Bug fixParamedicsfirefightingmanual→automatic

     Paramedics now correctly fight fires automatically.

     bugfix

   • ≈🐛Bug fixSmeltingbill UIhidden→visible

     Apparel made of non-smeltable stuff (like plate armor) now correctly appears in the smelting bill UI.

     bugfix

9. Jan 18, 2023·Update 1.4.3613 released+1-1

   • ≈🐛Bug fixUI Scale—→fixed

     Fixed a critical bug where new game installations could have an extremely high UI scale, making the game unplayable.

     bugfix

   • ▼🐛Bug fixTox Gas AI—→fixed

     AI will no longer attempt to use tox gas on targets that are immune to it.

     bugfix

   • ≈🐛Bug fixPower Display—→fixed

     Corrected the display of idle and active power consumption in the inspect string.

     bugfix

   • ▲🐛Bug fixAnimal Pathing—→fixed

     Fixed fence-blocked animals getting stuck when trying to reach diagonally accessible food.

     bugfix

   • ≈🐛Bug fixClothing—→fixed

     Fixed child prisoners attempting to wear adult clothing, which caused the items to disappear.

     bugfix