Immunity Protocol Update History: All Patches & Changes

Complete Patch Notes Overview

Immunity Protocol has received several significant updates since its initial release on June 9, 2026. This page compiles every major patch, hotfix, and content drop, providing a clear timeline of changes. The game, developed by Ijijanbos, is a single-player action indie title where you control an immune cell sentinel against evolving pathogen waves. Updates have focused on balancing the auto-shooting mechanics, introducing new enemy types, and refining the progression system. For a deeper look at the game’s core systems, check our gameplay overview.

Version 1.0 – Launch Day Update (June 9, 2026)

The initial release of Immunity Protocol included the base game with 5 biomes, 12 playable classes, and a full story campaign. Key features at launch were:

• Auto-shooting system with weapon evolution.
• Symbiote upgrades for passive buffs.
• Pathogen waves with 15 enemy types.
• Prestige system for endgame replayability.

This version also introduced the core progression loop, which is detailed in our progression guide. Players immediately reported minor balance issues, which were addressed in the first hotfix.

Hotfix 1.0.1 – Balance Adjustments (June 11, 2026)

This hotfix targeted early-game difficulty spikes and weapon tuning:

• Reduced health of "Swarm" enemies in Biome 1 by 15%.
• Increased drop rate of currency from normal enemies.
• Fixed a bug where the "Phage" symbiote did not stack correctly.
• Adjusted auto-aim sensitivity for controller support.

These changes improved the early-game experience, making it more accessible for new players. For more tips on getting started, see our beginner guide.

Patch 1.1 – The Biome Expansion (July 2, 2026)

The first major content update added a new biome, "The Lymph Node," along with three new elite enemies. Full patch notes included:

• New Biome: Lymph Node with unique environmental hazards.
• New Enemies: Elite "Necrosis" and "Mutagen" variants.
• Class Rework: The "Macrophage" class received a 20% damage buff.
• New Achievements: 10 new achievements for exploration.
• Performance: Optimized particle effects for lower-end PCs.

This update significantly expanded the game’s replayability. For a complete list of all enemies, visit our enemy types page.

Patch 1.2 – Co-op & Challenge Modes (August 15, 2026)

Version 1.2 introduced a cooperative mode for up to two players, along with a weekly challenge mode. Key changes:

• Co-op Mode: Local split-screen and online play via Steam.
• Challenge Mode: Randomized modifiers for high-score runs.
• New Weapons: Added "Plasma Cannon" and "Viral Injector."
• Bug Fixes: Resolved a crash when entering the final boss arena.

Co-op mode requires both players to own the game. For more details on playing with friends, check our co-op guide.

Patch 1.3 – Quality of Life & UI Overhaul (September 20, 2026)

This patch focused on improving the user interface and quality-of-life features based on community feedback:

• UI Overhaul: Redesigned inventory and skill tree menus.
• Auto-Loot: Items are now automatically collected within a 3-meter radius.
• Save Slots: Increased from 3 to 10 save slots.
• Difficulty Tuning: Adjusted scaling for Prestige levels 5-10.

These changes made the game more comfortable for long sessions. For a full breakdown of settings, see our settings guide.

Future Updates & Roadmap

The developer, Ijijanbos, has announced plans for additional content, including a new game mode ("Survival") and more classes. All future updates will be documented here. Stay tuned for patch notes on new events and collaborations. For the latest news, visit our community guide.