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Stellaris
Stellaris
4.5.4|Nov 11, 2026
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Stellaris 4.5.4: Multiplayer Stability Fixes

2/5 Minor

Stellaris 4.5.4 fixes multiplayer out-of-sync issues, deleted federation ship designs, repeated trade counts and several crashes.

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Key Changes

  • 1The hotfix addresses multiplayer stability issues introduced in the previous version.
  • 2Federation joiners no longer delete their custom ship designs.
  • 3Market prices and trade statistics no longer count a month of trades again on every save load.
  • 4The hotfix fixes an out-of-sync issue and crash involving enclave and mercenary trade offers.
  • 5A potential out-of-sync issue and crash involving Tempest relic storms has been fixed.
  • 6Players are no longer logged out of their Paradox account while the game loads.

All Changes

🐛Bug Fixes(5)

  • fixFixed federation joiners deleting their custom ship designs.
  • fixFixed governor and general modifiers remaining lost after a colony changed controller and returned.
  • fixFixed colony modifiers from species traits and cosmic storms growing each day until recalculation.
  • fixFixed market prices and trade statistics counting a month of trades again on every save load.
  • fixFixed players being logged out of their Paradox account while the game loads.

🌐Multiplayer Stability(41)

  • fixFixed a Hotjoin out-of-sync issue where a joining player could pick different random border colors.
  • fixFixed an out-of-sync issue where country intel was calculated before other updates finished.
  • fixFixed a Hotjoin out-of-sync issue in travel shortcuts caused by out-of-date system status.
  • fixFixed an out-of-sync issue where devastation could target a pop that had left its colony.
  • fixFixed a Hotjoin out-of-sync issue caused by astral rift owners being recalculated only on the joining player.
  • fixFixed a Hotjoin out-of-sync issue in modifiers caused by waystation links differing after a join, mostly after an expulsion.
  • fixFixed a Hotjoin out-of-sync issue in ship modifiers caused by ships keeping their old cloak state when added to a fleet.
  • fixFixed a Hotjoin out-of-sync issue caused by a joining player getting an arkship with an extra armor part.
  • fixFixed a Hotjoin out-of-sync issue caused by a ship aura that was not cleared on the joining player.
  • fixFixed a Hotjoin out-of-sync issue caused by cosmic storms changing course only on the host.
  • fixFixed a Hotjoin out-of-sync issue caused by fleet orders losing their state on save or join.
  • fixFixed a false Hotjoin out-of-sync issue in the spy network check.
  • fixFixed a Hotjoin out-of-sync issue caused by queued fleet actions losing their effect after a load.
  • fixFixed a Hotjoin out-of-sync issue where a joining player refused a nomad waystation order.
  • fixFixed a Hotjoin out-of-sync issue in colony and Arkship modifiers.
  • fixFixed an out-of-sync issue between players of different languages when a stored name uses grammar.
  • fixFixed an out-of-sync issue where a delayed event could be dropped on only one machine.
  • fixFixed an out-of-sync issue caused by AI empires differing between machines.
  • fixFixed a Hotjoin out-of-sync issue where a finished focus reward could finish again on only one machine.
  • fixFixed a Hotjoin out-of-sync issue in federation unity and navy size fleet modifiers after a join.
  • fixFixed a Hotjoin out-of-sync issue where modifiers were recalculated on different days after a join.
  • fixFixed an out-of-sync issue where two starbases in one system updated the same list at once.
  • fixFixed an out-of-sync issue in the starbase design fallback, which ran on a worker thread.
  • fixFixed a potential Hotjoin out-of-sync issue in border ranges when a storm covers a relay.
  • fixFixed a Hotjoin out-of-sync issue caused by storm lists being sorted differently on the joiner.
  • fixTempest: Fixed a potential out-of-sync issue and crash with Tempest relic storms, whose names now match on all machines.
  • fixFixed a Hotjoin out-of-sync issue in storm sector blocking after a reroute.
  • fixFixed an out-of-sync issue in modded games that destroy a storm field with a script effect.
  • fixFixed a Hotjoin out-of-sync issue where a nomad waystation order could be refused after a join.
  • fixFixed an out-of-sync issue in wilderness empire biomass counts.
  • fixFixed an out-of-sync issue in AI attitude updates.
  • fixFixed an out-of-sync issue and crash with enclave and mercenary trade offers.
  • fixFixed a Hotjoin out-of-sync issue where crisis empires could pick different enemies.
  • fixFixed an out-of-sync issue in galactic market price changes.
  • fixFixed a Hotjoin out-of-sync issue in ship bonus updates.
  • fixFixed an out-of-sync issue in names stored by event effects.
  • fixFixed the lobby list not updating when the online connection arrives after the screen is open.
  • changeThe lobby list now shows when it is waiting for the online connection.
  • fixFixed joining a game before the online connection is ready.
  • fixFixed the game not offering a new login after the online connection was lost.
  • fixFixed a Hotjoin issue where a country could stay marked as human only on the joining player.

🛠️Crashes and Performance(2)

  • fixFixed a crash when a fleet runs a scripted effect on arrival.
  • fixFixed a crash from empty name lists and sped up random name lookup.

Summary

The Cygnus hotfix addresses Hotjoin and other multiplayer synchronization problems involving fleets, storms, modifiers and AI. It also fixes colony modifier and account login issues, improves lobby connection handling, and resolves crashes involving trade offers, scripted fleet effects and empty name lists.

← OlderStellaris 4.5.3: Experimental AI and Tooltip ChangesNov 5, 2026

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