Changing your server's Minecraft version is one setting in Startup, but it can break your world or your plugins/mods if you're not careful. Back up first.
Worlds can only move to a newer Minecraft version, never back to an older one. If you're not sure you want to upgrade, back up in Backups first so you can restore if needed.
How to change it
- Open Backups and take a fresh backup before touching anything.
- Open Startup and see what versions are available for your server type (Vanilla, Paper, Fabric, Forge, NeoForge).
- Select the version you want.
- If you run plugins or mods, check they support the new version first, in Plugin Installer or Mods Installer, before restarting.
- Restart the server.
- Check Console for errors. It'll name the exact mod or plugin causing a problem, if there is one.
You don't need to set a Java version separately, your Server Type picks the right one automatically.
Still stuck?
Plugins or mods stopped working: they likely don't support the new version yet. Revert to your last working version in Startup rather than waiting mid-session.
Server won't boot after switching: see Fix "Missing Dependency" and Mod Conflict Errors or How to Read the Crash Log.
Accidentally upgraded and want your old world back: restore from Backups. There's no way to force a downgrade once a world has loaded on a newer version.
Still won't boot after checking Console and versions: open a support ticket with your server ID and the exact error, staff can confirm whether your version and loader combination is actually available.
Did this solve it?
If you are still stuck, our team can look at your server directly.