When the Steam Workshop has a newer version of a mod, its row on the Mods page shows the chip Update. Choose Update on the row, or Update all, then apply. Until the server has the new version, players who already updated cannot join.
See which mods are out of date
- Open the Mods page.
- Stay on the On this server tab.
- Look for rows with the chip Update (1).
Each such row says: “The Workshop has a newer version. Players who already have it cannot join until the server has it too.” A server left behind turns those players away.

- Update chip
- Update all
- Apply and restart
Pick what to update
- Choose Update on one row. The button then reads Updates on apply. Choose it again to change your mind.
- Choose Update all (2) to pick every mod that has the chip. The button then reads Update none. Choose it to clear the picks.
If a row says that the version on the server is not known, its button reads Download again. The panel did not download that copy, so it cannot tell its version.
Nothing is downloaded yet. The picks are a draft, and the bar Changes not applied yet lists them.
Apply
- Choose Apply (server off) or Apply and restart (3) (server running).
- Read the box Apply the mod changes?. It lists Downloads and the size.
- Confirm.
A server that is off downloads and stays off. Applying is how a mod gets its new version: the panel does not update mods on its own at start.
After it finishes, the page says “Last apply downloaded (names).” Keys of updated mods are copied for you into the keys folder.
If an update fails
The page says “(name) could not be updated (reason). The copy the server had stays and keeps loading.” Your server still runs the old version. Try again in a few minutes. See mod download failed.
If a mod shows Not on the Workshop, the Workshop no longer offers it. The copy on the server keeps loading, but it cannot be updated.
If it does not work
- A row says the Workshop did not answer. The row then shows what was last known. Reload the page in a minute.
- Update all is missing. No mod has a newer version.
- Players still cannot join after an update. Their mod version must match the server’s. See mod keys and signatures.
More about the game: Arma 3 servers.
Sources: steamcommunity.com: Workshop