Tactical Action · Guides & deep dives

0001: Pin Unreal Engine 5.5 LTS

V4 spans tactical FPS, stealth tactics, action RPG, RTS, and 2D arcade cells.

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Status: Accepted

Date: 2026-05-23

Context#

V4 spans tactical FPS, stealth tactics, action RPG, RTS, and 2D arcade cells. The project needs a stable engine baseline so gameplay code, binary assets, platform cooks, and third-party middleware do not drift during launch development.

Decision#

V4 pins the launch branch to Unreal Engine 5.5 LTS. V4/ue/V4.uproject uses EngineAssociation 5.5, and CI jobs are named and configured around UE5.5.

Consequences#

  • Engine upgrades during the launch window require a new ADR and migration plan.
  • Plugins and middleware must certify against UE5.5 before they can enter the launch branch.
  • Automation workers must expose UE5.5 editor and commandlet paths through UE_EDITOR and UE_ROOT.