Fix Valheim "Incompatible Version" Error
Incompatible versionwrong versionversion mismatch"Incompatible version" means your Valheim client and the server are on different versions — or, on a modded server, your mods don't match. Here's the fix.
Vanilla: update both sides
After a Valheim patch, the server must update too. If your client updated but the server didn't (or vice-versa), you get this error. Update the server to the current build and restart it.
Modded: match BepInEx & mods
On a modded server, the client needs the same mods at the same versions as the server. A mod that updated on one side causes an incompatible-version mismatch. Use a mod manager (r2modman/Thunderstore) to sync — see Valheim server not showing.
Update the server first, then players, then rejoin. Restart the server so it actually runs the new version before testing.
Client and server (and all mods) must be the same version. Update the server, sync mods, restart, rejoin.
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Frequently asked questions
Why does Valheim say "Incompatible version"?
Your client and the server are on different game versions, or — on a modded server — your mods don't match the server's. Update both to the same version and sync mods.
How do I fix it on a modded server?
Use a mod manager like r2modman to install the exact mods and versions the server runs. A single mismatched mod version triggers the error.
Who updates first, server or client?
Update the server to the current build and restart it, then have players update. Testing before the server actually restarts on the new version will still show the error.
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