VEIN Dedicated Server Update Guide
VEIN has main and experimental branches. Treat an update as a package and save migration: record what you had, back it up, update the same instance, and prove the world works before the group returns.
VEIN 0.025 (26 September 2026): read this before you update
0.025 went public on 26 September 2026 and changes what an existing world does, not only the client. From the official 0.025 patch notes:
- A structural support system: building things too tall now makes them fall.
- Damage profiles were rebalanced, and zombies can now damage all base tiers.
- Building maintenance, upkeep and salvaging were added to all buildings, still marked work in progress; a building's dirtiness now follows its maintenance.
- The utility cabinet now marks its area with flags and pylons instead of a fixed static radius.
- A new map area extends north from Franklin County.
So take the pre-update copy below before the first 0.025 start, and walk the tallest and most exposed bases right after it. Expect players on 0.025 to be unable to join a server still on 0.024: a 0.025 server logs a new project version when it starts, and Unreal Engine includes the project version in the check a player must pass to connect. Update the server before the group's game clients update.
0.025 Hotfix 1 (28 September 2026)
Hotfix 1 for 0.025 went public on 28 September 2026 (server app 2131400, build 25581145). The server-relevant lines in its patch notes: the admin menu works again for the first player on a server (and in singleplayer), door lock state no longer desyncs in multiplayer, persistent corpses can be looted, dedicated servers no longer play music to players who switched it off, CPU and replication performance improved, minor networking errors were fixed, and built storage holds 50% more (the notes say "generally"). It also adds a ServerPrintConsoleVariables cheat command. Update the server package the same way as for 0.025, below.
0.025 Hotfix 2 (4 October 2026)
Hotfix 2 went public on 4 October 2026 (server app 2131400, build 25708939, up from 25581145 for Hotfix 1). Two of its fixes change what an existing world does, so read those first:
- Everything decaying after 10 in-game weeks is fixed. If your world has been running long enough to cross that mark, the decay you were seeing was the bug, not upkeep working as designed.
- An iron duplication exploit is closed. Treat the iron already in your world as suspect rather than assuming the economy was clean.
The rest of the server-relevant lines: utility cabinet flag pylon editing now works on dedicated servers, vehicles no longer desync and fall through the ground for clients in multiplayer, the furniture permission bug that blocked moving furniture out of a utility cabinet area is fixed, destroyed items such as body bags no longer keep smelling in multiplayer, DM no longer crashes when the target player is across the map, some admin menu UI issues are fixed, and vehicle ticking is better optimised.
Update the server package the same way as for 0.025, below. Because the build id moved, a client on Hotfix 2 and a server still on Hotfix 1 are on different builds; update the server before the group's clients do.
Before updating
- Read the official announcement feed.
- Record app
2131400, branch, build, OS, launch command, and current ports. - Tell players the maintenance window.
- Stop cleanly and copy the active save and configuration.
Update and test
- Update the same server package; do not silently switch branch.
- Start privately and read the log.
- Join with one client on the matching build.
- Check world identity, base, player access, a harmless save, restart, and reconnect.
- Only then reopen the server.
Rollback
Stop the new process, preserve its logs and save, restore the dated pre-update copy, and start a test instance. Never delete the failed copy until the original world and build are confirmed healthy. Use save management.
Related guides
Run updates through managed VEIN hosting with a panel workflow.