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Last updated: September 18, 2026
Your American Truck Simulator dedicated server and every player's game must run the same version, or players cannot join. This guide shows you how to move the server to a different version.
American Truck Simulator ships versions as Steam branches. The stable release is the default, and older or temporary branches exist for compatibility. The dedicated server (App ID 2239530) follows the same branches, so you select the version you want and reinstall the server files.
Save a copy of the following so you can restore your setup if the version change causes problems:
server_config.siiserver_packages.sii and server_packages.datIn Steam, right-click American Truck Simulator, choose Properties > Betas, and select the branch that matches your server. Let Steam finish updating before you try to join.
If you run the server yourself, select the branch in the install command:
steamcmd +login anonymous +force_install_dir /path/to/server +app_update 2239530 -beta <branch> validate +quit
Omit the -beta part to return to the default stable release.
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