October 8 — Patch 1.4.0
The official notice lists PS5, Steam and Epic Games Store and asks players to check for menu version v1.5.154194. It adjusts enemy behavior, fixes a Part 5 progress blocker and improves PC frame pacing and streaming stutter.
Part 6 puzzle changes add a reference manual for Remote Systems Control and clarify the Aux Line pipe layout. See the related Brae, CEG and SWDP guide for solutions and the differing published console readings.
September 30 — Patch 1.3.1
For Steam and Epic Games Store, this patch reduces stutter caused by shader precompilation. The corresponding menu version is v1.4.153829.
October 9 — developer explanation
Screen Burn describes 1.4.0 as tuning encounters toward the intended challenge across difficulty settings while preserving tension. Its explanation does not describe a blanket reduction of all difficulty.