Stellaris 4.5.4 patch released (1b4f) Notes (11th November 2026)

by PDX-Loke

Hello everyone,

We have a small hotfix patch ready for release, mostly to resolve number of multiplayer stability issues introduced with the previous version.

4.5.4 should now be available via Steam, GOG, and MS Store.

Please find the change log below.

4.5.4 ‘Cygnus’ Hotfix Release Notes

Bugfix

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

Stability

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• Fixed a Hotjoin OOS in travel shortcuts caused by out-of-date system status.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

Let us know if you are still experiencing out of sync related issues.

Thank you!