The Callisto Protocol

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Patch Notes

[v. 5.04]

July 25, 2023


  • Fixed some instances where New Game+ manual saves were not generated after completing the base game.


[v. 5.03]

July 17, 2023


  • Fixed an issue related to ray tracing which caused crashes


  • Fixed an issue where users could not obtain an unreachable audio log in Tower


  • Fixed Out-of-World streaming issues in Final Transmission
  • Continued performance optimizations


[v. 5.02]

June 29, 2023


  • Added in auto-play functionality for audio logs based on player feedback. In order to maintain The Callisto Protocol's narrative structure and avoid over-lapping audio, some of the in-game audio log locations were moved. Full list below;
      • Moved one log pickup to the end of the hallway before the medical room, after the beta path door
      • Moved one log pickup inside the cafeteria section
      • Moved one corpse harvest/pickup to the corner of the red room
      • Moved one log pickup back to its original location in the upper corner of a room onto a box with a valve wheel
    • LOST
      • Moved one corpse harvest/pickup to the far corner of the garage
    • BELOW
      • Moved one log pickup to the left of the moving platform exit
    • COLONY
      • Moved one corpse harvest/pickup to the top of a ladder before the shimmy
      • Moved one log pickup closer to a REFORGE station
    • TOWER
      • Moved one log pickup to be inside a prison cell
      • Moved one log pickup to be inside a Biophage infested hallway
      • Moved one log pickup onto a table by a cherry tree


[v. 5.01]

April 18, 2023


  • Take your enemies apart limb by limb and experience the thrill of instantly dismembering your foes
  • Players cannot earn campaign achievements or trophies while playing Dismemberment Mode


  • Added functionality allowing players to skip cutscenes


[v. 4.01]

February 07, 2023


A challenging take on The Callisto Protocol’s survival-horror experience, intended to push you to your limits, Hardcore Mode is not for the faint of heart. Here’s what you can expect;

  • Ammo, health, and credits are harder to come by and not every Biophage will drop loot
  • Increased enemy damage
  • Decreased Stun Baton damage
  • Increased enemy mutation speed
  • Contraband value is reduced
  • Hardcore Mode New Game+ (requires completion of standard Hardcore Mode playthrough)
  • New Achievements / Trophies to hunt


  • Players that were not correctly granted the "The Protocol is About Life" achievement upon completing the game will be automatically granted the achievement
  • Localization fixes for leveling and VO/subtitle mismatches
  • Optimized enemy combat AI when player is surrounded by multiple enemies


  • Updated font rendering and UI elements for readability
  • Created a rendering functionality profile specifically for Steam Deck with the best settings for smooth gameplay
  • Updated control schemes for SteamDeck controls


  • Ray tracing performance improvements


[v. 3.01] 

January 17, 2023 


  • Users who previously completed the game will have access to NewGame+ after the patch. 
  • Application restart may be required. 
  • Requires an active save file from game completion. 


  • Fixed an issue where some users were not correctly granted the "The Protocol is About Life" achievement 
  • Added New Game Plus. Complete the game to unlock New Game Plus and carry your pression over to a new save. All weapons, upgrades, and Callisto Credits can be collected at the first Reforge 
  • General performance optimizations across all platforms 
  • Players no longer take damage when vaulting over obstacles 
  • Fixed multiple issues where certain camera angles or progression paths could cause environments to stream out and allow Jacob to fall through the ground 
  • Consistency pass on cabinets, lockers, and shelves to display correctly in High Contrast mode 
  • Voice leveling and subtitle mismatch adjustments across localized languages 


  • Fixed low frequency crash in the Tunnels level during the Two Head fight 
  • Skip Cinematics button has been mapped to the Interact/Pickup input 
  • Fixed a long hitch when enabling Ray-Traced Shadows in the main menu 
  • Prevented mouse cursor from displaying during some area transitions 


  • Fixed low frequency crash in Snowcat when Jacob is talking to Dani 


[v. 2.01]

December 15, 2022



  • Prevent enemies from attacking while you are attacking another enemy by adjusting uninterruptible windows for all player baton attacks vs standard enemies to add an extra 7 frames between hit and recover
  • Reduced frequency of players being attacked from behind. Enemies now prioritize grappling or repositioning instead of attacking
  • Widened incoming attack camera angle
  • Widened angle for dodging off screen attacks
  • Reduced damage taken multiplier when attacked from behind
  • Increased player facing away maximum angle for Grunt and Blind
  • Dodge optimization:
    • Valid dodge angle now allows player to have stick slightly forward and right/left while still dodging (45 -> 30 degrees)
    • Dodging at the end of the dodge window no longer means playing dodge animation and getting hit
  • Increased animation speed for:
    • Health injector usage
    • Weapon swapping
    • Weapon reloading
    • Upper receiver swapping
  • Auto-play reload animation when switching to an empty weapon
  • Continue initiated weapon swaps after interruptions
  • Extend amount of time between KTV appearance and mutation
  • Fixed phantom arm kills by armless NPCs
  • Increased audio cue volume for Danglers 
  • Reduced default setting for camera shake
  • Added player invulnerable window to all 150 cm vaults
  • Changed Two Head to a two hit kill on the player in Medium Security, and a three hit kill in Minimum Security
  • Final boss encounter combat optimizations
  • Minetown AI pathing and spawning improvements 


  • Optimized streaming to reduce memory usage in:
    • Habitat Water Maze
    • Snowcat Bridge Collapse
  • Fixed a memory leak with the Reforge 3d Printers


  • Fixed voice leveling issues in multiple languages
  • Fixed subtitle/vo mismatch issues in Korean
  • Fixed instances of unlocalized lines in multiple languages
  • Fixed incorrect text descriptions on menus in Korean
  • Fixed untranslated instances of “Unlocked” on doors in multiple languages
  • Fixed instances of missing voice processing in multiple languages


  • Added an option to enable performance mode when creating new games
  • Added an option to skip death cinematics and restart from checkpoint faster


  • Improved lighting performance on AMD cards (reduced VGR pressure of FDeferredLightPS)
  • Fixed an exploit that allowed players to receive the "The Protocol is About Life" achievement after beating the game once on a lower difficulty


  • Optimized lighting for multiple cinematics in Habitat and Tower


[v. 1.02]

December 06, 2022


  • Added popup dialog to display when players change ray-tracing settings and trigger a shader compile
  • Added a popup progress dialog to display in the main menu when compiling shaders
  • (Epic Specific) Fixed an issue preventing achievements from unlocking and displaying correctly
  • (Epic Specific) Fixed an issue causing the Terms Of Service to always display upon loading the app

[v. 1.01]

December 02, 2022


  • Updated PSO cache to further reduce stuttering during gameplay

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Experience a terrifying, immersive next generation take on survival horror from the mind of Glen Schofield and the team at Striking Distance Studios. Prepare yourself to survive the horrors stalking the halls of Black Iron Prison and discover the secrets that lie beneath.