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Valheim / Online & account

Valheim: Client and server version mismatch

Since Valheim 1.0, patches arrive in quick succession, most recently 1.0.20 and 1.0.21 in October 2026. A version mismatch occurs as soon as client and server are on different builds, for example because the dedicated server is a separate Steam application that was not updated, or a platform receives the patch later. Iron Gate points out such delays for several patches.

Updated: ·2 min read·Windows / PC
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STRAIGHT TO THE SOLUTION

Start here

01Step 1: read the versions↓02Step 2: update the server↓03Step 3: account for platform delays↓
01

Step 1: read the versions

  1. Read the client version in the main menu and the server version in the console startup output. Note both.
  2. Check: if they differ, the mismatch is confirmed.
02

Step 2: update the server

  1. The dedicated server is a separate application under Tools in Steam. Stop it with Ctrl+C, back up the world and update Valheim Dedicated Server.
  2. Steam resets start_headless_server.bat in the process. Use an edited copy or re-enter name, world, port and password.
  3. Check: after restarting, the startup output must show the same version as your main menu; only then is a join test worthwhile.
03

Step 3: account for platform delays

  1. Iron Gate ships some patches with a delay. For 1.0.20, crossplay with Mac App Store players only worked once the patch was available there; for other patches, crossplay stayed usable during the rollout.
  2. Check: if the mismatch only affects players on one platform, wait for their update.
04

Step 4: check beta branches and mods

  1. Check whether client or server uses a test branch instead of the stable one. Both must be on the same branch.
  2. Test a backed-up copy of the world without mods. Only re-enable mods once they are compatible with the current version.
05

If the mismatch remains

  1. Fully restart server and client after updating and make sure no old server process runs in the background. Iron Gate warns that closing via the X can leave the server running.

Related guide

Sources and current status

Frequently asked questions

Is updating my own game enough?

Not if the server still loads a different version or incompatible mods.

Why did Steam not update my server?

The dedicated server is a separate application under Tools and must be updated separately.

Will I lose my settings when updating?

The original start file is reset. An edited copy is kept.

Where can I see whether a patch is out for my platform?

Iron Gate mentions delays for individual platforms in the patch notes, for example the Mac App Store for 1.0.20. Check there before troubleshooting.

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