ATCHED
Stellaris
Stellaris
4.5.1|Sep 24, 2026
View on Steam↗

Stellaris 4.5.1: Fleet Automation and Stability Fixes

2/5 Minor

Fleet automation now follows player selections, and a common multiplayer Out of Sync is fixed. Automatic disengagement after 15 days without combat is disabled.

Share:

Key Changes

  • 1Fleet automation now follows the actions and options players select.
  • 2A very common multiplayer Out of Sync involving spawning custom AI empires has been fixed.
  • 3Automatic disengagement after 15 days without combat has been disabled to address ships disappearing from battle.
  • 4A Synaptic Lathe built by nomads in another empire's system no longer transfers to the Starbase owner.
  • 5A startup crash caused by an unresolved technology has been fixed.
  • 6A galaxy generation crash caused by a species without assigned name data has been fixed.

All Changes

⚖️Balance(1)

  • changeSynaptic Lathe: A Synaptic Lathe built by nomads in another empire's system no longer changes ownership to the owner of the Starbase.

🐛Bug Fixes(3)

  • fixFleet automation: Fleet automation now follows the selected actions and options instead of choosing for itself.
  • removeHarvesting Agreements Automation: Removed the Harvesting Agreements Automation sub-menu setting because the Trade Action has been removed.
  • fixDisabled automatic disengagement when a ship has not taken part in combat for 15 days, which caused ships to disappear from battle.

🛠️Stability(13)

  • fixFixed a very common Out of Sync after the first day of Multiplayer Games where custom AI empires were spawning.
  • fixFixed a rare crash when joining an alliance.
  • fixFixed a rare crash when a starbase automatically rebuilt its design after changing level.
  • fixFixed a game startup crash caused by a technology that could not be resolved.
  • fixFixed a galaxy generation crash caused by a species with no assigned name data.
  • fixFixed a crash when an empire joined a war.
  • fixFixed a crash during first contact between empires.
  • fixFixed a crash when accepting a federation law vote.
  • fixFixed a crash when releasing a subject or when a subject asked to be released.
  • fixFixed a crash when a subject's overlord changed.
  • fixFixed a crash when spending diplomatic weight on a galactic community resolution.
  • fixFixed a rare crash when a waystation was destroyed after its controlling empire had been eliminated.
  • fixspawn_natural_wormhole: Executing a spawn_natural_wormhole effect targeting an inexistent spatial reference object no longer crashes the game.

🔧Modding(1)

  • changeDuplicate keys in a database now always log an error.

📅Coming Soon(3)

  • changeThe hotfix will follow on MS as soon as possible.
  • changeAutomatic disengagement for ships that have not participated in combat will return in a future release after it is made less overenthusiastic.
  • changeSynaptic Lathe: A future patch is likely to give the owner of a system containing a Synaptic Lathe some means to deal with it.

Summary

The 4.5.1 hotfix is available on Steam and GoG; MS will follow as soon as possible. Nomad-built Synaptic Lathes retain their ownership in another empire's system, and the obsolete Harvesting Agreements Automation setting has been removed.

Stability fixes address crashes during startup, galaxy generation, diplomacy and other situations. Automatic disengagement is planned to return in a future release.

← OlderStellaris 4.5 "Cygnus" now available!Sep 22, 2026Newer →Stellaris Dev Diary #434 - 4.5.2 'Cygnus' Tentative Patch NotesOct 1, 2026

More from Stellaris

View all patches →