How do I update my Project Zomboid server to Build 42?

Note

Build 42 is now stable. It is the default public Project Zomboid release. You do not need to set a Steam beta branch to run B42 on AleForge or in Steam. New servers install Build 42 automatically.

Not sure whether to stay on Build 41? See Project Zomboid Build 41 vs Build 42.

Already on Build 42

If Steam Beta Branch on the Startup page is empty (default), your server is on the current stable Build 42 release. Start the server and let Steam update as usual.

Players should also leave Steam on Default Public Version (no beta selected).

Previously set to unstable

If you switched to Build 42 while it was still on the unstable branch, clear that setting so you stay on stable:

1. Open the AleForge Panel
2. Stop the server
3. Create a backup from Backups
4. Go to Startup
5. Clear Steam Beta Branch (leave it blank)
6. Go to Settings → Reinstall Server
7. Start the server once installation finishes

Stay on Build 41 instead

To keep playing Build 41 (for older saves or mods), use the legacy41 Steam branch on both the server and every player’s game client. See How to stay on Project Zomboid Build 41 (legacy41) or the comparison guide Build 41 vs Build 42.

Important notes

• Server and clients must be on the same build (Build 42 stable, or Build 41 via legacy41)
• Build 41 and Build 42 worlds are not interchangeable — back up before any branch change
• Prefer mods marked compatible with your current build; older B41-only mods will not work on Build 42