# Upgrading ToolsTalk 2

If you are planning to upgrade from a ToolsTalk 2 version that is earlier than 2.21, follow the steps below and also make sure that Atlas Copco Data Communication (ACDC) is version 2.5 or later.

Before the upgrade is started:

- Make sure that the ToolsTalk 2 server is running.

- Back up the ToolsTalk 2 database.

- Make sure that .NET 8 is installed.

After the upgrade has finished, install ToolsTalk 2 clients, version 2.25.