# How to Fix ATS Version Mismatch & Downgrade Your Game (/docs/american-truck-simulator/version-mismatch)



The most common connection issue with ATS servers is a **version mismatch** — the game client updated but the dedicated server hasn't yet.

Why This Happens [#why-this-happens]

* Steam auto-updates the game client immediately
* The dedicated server update via SteamCMD can lag behind by **several days**
* Both must be on the exact same version to connect

Fix 1: Downgrade Your Game Client [#fix-1-downgrade-your-game-client]

1. In Steam, right-click **American Truck Simulator** → **Properties**
2. Go to the **Betas** tab
3. Select a `temporary_X_XX` compatibility branch from the dropdown
4. Steam will download the older version
5. You can now connect to the server

Fix 2: Update the Server [#fix-2-update-the-server]

If a server update is available:

1. Stop your server
2. On the **Dashboard** in the [XGamingServer Panel](https://panel.xgamingserver.com), click **Reinstall Server**
3. Wait for the update
4. Start your server

Prevention [#prevention]

Disable automatic game updates in Steam to avoid surprise version mismatches:

* Right-click ATS → **Properties** → **Updates** → Set to "Only update this game when I launch it"

> 💡 **Tip:** Check the SCS Software blog or forums when a new update drops — if the server update isn't out yet, downgrade your client temporarily.

Related Guides [#related-guides]

* [How to Update Your Server](/docs/american-truck-simulator/update)
* [How to Join Your Server](/docs/american-truck-simulator/join-server)