Project Zomboid: B41 vs B42 – Choosing Your Survival Build

Updated August 10, 2026: Build 42.20 is now the public Stable release. Build 41 saves are not compatible with Build 42. Use the legacy41 Steam beta only when an existing save, mod set, or server requires it. See The Indie Stone's official release notes.

Which build should you choose?

New game: Build 42.20 Stable

This is the default for a new save. Check each Workshop page for its supported build and latest update before enabling mods.

Existing B41 save or mod setup: Build 41 Legacy

Back up the save first and use the legacy41 branch. Do not assume a B41 save or mod will work on Build 42.

Decision checklist

• Start a new unmodded game on Build 42.20 Stable.
• Confirm the target build on every Workshop mod page.
• Keep B41 only for a save, mod set, or multiplayer server that still depends on it.
• Back up saves before changing branches.

Summary

Build 42.20 Stable is the standard choice as of August 10, 2026. Build 41 Legacy remains an explicit compatibility option.