How to Use Build 42 on Your Project Zomboid Server

Important!

Before proceeding, you must stop your server and take a full backup.

Project Zomboid Build 42 is currently Unstable. Developers strongly advise disabling all mods, disabling debug mode in multiplayer, and limiting servers to whitelisted/Steam Co-op play with a maximum of 20 players. Please note that future unstable updates will cause gameplay disruptions, and saves created prior to Unstable 42.13 are no longer compatible.

Note:

Make sure to start your server for the first time so that the .cache folder can be generated.

1. Update Your Steam Installation

On Steam, set your game to use the Unstable beta branch.

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2. Change the Server Name (Recommended)

This will force the server to generate a new world, and preserve the old world.

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3. Set the ‘Beta Branch’ to the Version of Build 42 You Want

For example, If you want to play the latest available version of Build 42, enter unstable.

But if you want to play (or keep your server) on an older version of Build 42, enter outdatedunstable.

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4. Select ‘Reinstall Server’

Go to your ‘settings’ tab and scroll down.

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5. Select the Drop-Down Menu

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6. Select the ‘Keep current files and reinstall server‘ or ‘Delete current files and reinstall server‘ Reinstall Option

Keep current files and reinstall server	Reinstalls the server software without touching your existing files. Perfect for fixing a broken install while keeping your world and config intact.
Delete current files and reinstall server	Wipes all current files and performs a clean reinstall. Useful when you want a completely fresh start, whilst keeping any settings configured on the startup page.

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7. Select ‘Continue’

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8. Select ‘Confirm reinstall’

Important!

This action is permanent and cannot be reversed. Proceed with caution.

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9. Adjust the Java Arguments

On the Files tab, open the ProjectZomboid64.json file and edit the line containing the “-Xmxg” argument. It will likely be displaying as “-Xmx6g” or another value. Change the number to be 2 less than the amount of RAM your server has in GB. For example, an 8GB server should be “-Xmx6g” or a 6GB server should be “-Xmx4g”.

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