Immunity Protocol Patch Notes: Full Update History

Latest Patch Notes Overview

Immunity Protocol is a fast-paced auto-shooter survival game where you control an immune cell sentinel against evolving pathogen waves. The developer, Ijijanbos, regularly releases patches to balance gameplay, fix bugs, and introduce new content. This page serves as the central hub for all official patch notes. You can also check the game overview for core mechanics.

Patch 1.0.0 - Launch Day Update

Released on June 9, 2026, this is the initial public build of Immunity Protocol. The patch includes all core features: manual movement with automatic weapon fire, a skill upgrade system, and symbiotic equipment. The first wave of pathogens includes basic bacteria and viruses. For new players, refer to the beginner guide for starting strategies.

New Features

• Core Game Loop: Implemented the full auto-shooting and movement system.
• Skill Tree: Unlockable upgrades for damage, fire rate, and movement speed.
• Symbiotes: Basic equipment slots for defensive and offensive boosts.
• Enemy Variety: Five distinct pathogen types with unique behaviors.

Balance Changes

• Base player health set to 100.
• Pathogen spawn rate increases every 30 seconds.

Bug Fixes

• Fixed an issue where the game would crash on certain hardware configurations.
• Resolved a visual bug with the pixel shader on the main menu.

Patch 1.0.1 - Stability Hotfix

This small patch was released shortly after launch to address critical stability issues. It focuses on performance and crash fixes. If you experience performance problems, the performance guide offers additional troubleshooting tips.

Bug Fixes

• Fixed a memory leak that occurred during extended play sessions.
• Resolved a crash when defeating the first elite enemy.
• Improved loading times for the bio-system map.

Technical Improvements

• Optimized particle effects for lower-end PCs.
• Updated the game engine to version 2026.1.

Patch 1.0.2 - Balance Tuning

This update adjusts the difficulty curve based on community feedback. The developer aimed to make the early game more accessible while increasing the challenge in later waves. Understanding the progression system will help you adapt to these changes.

Gameplay Adjustments

• Reduced the health of basic bacteria by 15%.
• Increased the damage output of elite viruses by 10%.
• Adjusted the drop rate of health pickups to be more consistent.

Quality of Life

• Added a damage number display option in settings.
• Improved the minimap clarity for objectives.

Patch 1.0.3 - New Content Drop

The first major content update introduces a new enemy type and additional symbiotes. Players can now face the "Prion" pathogen, which replicates rapidly. For more details on surviving these threats, see the enemy types guide.

New Content

• New Enemy: Prion – a fast-spreading pathogen that splits into smaller units on death.
• New Symbiote: "Viral Armor" – grants temporary invulnerability after taking damage.
• New Skill: "Cell Division" – creates a decoy to distract enemies.

Bug Fixes

• Fixed a bug where the "Cell Division" skill would not activate correctly.
• Resolved an issue with the audio cutting out during intense combat.

Patch 1.0.4 - Endgame Refinement

This patch focuses on the endgame experience, adding a new challenge mode and adjusting the prestige system. If you are ready for harder content, the challenges guide provides strategies for each mode.

New Features

• Challenge Mode: Unlockable after completing the main campaign. Features modified enemy stats and limited resources.
• Prestige Rework: Prestiging now grants permanent bonus stats instead of a single skill point.

Balance Changes

• Increased the health of all enemies in wave 20 and beyond.
• Reduced the cooldown of the ultimate ability by 5 seconds.

Future Updates

The developer has confirmed plans for more content, including new biomes and a co-op mode. For the latest news, keep an eye on the official Steam page. You can also check the update history for a complete log of all changes. The game's tagline remains true: survive the collapsing bio-system against evolving pathogens.