Updating Forge Version

I’m trying start a moddeed minecraft server.
When making the server, it requested forge version 47.3.6 for a mod.
I went ahead & changed the .forge-manifest.json to list 47.3.6
I’ll list the updated file below.

The issue is I’m not sure the process of updating forge?
I added the file to the root of the minecraft server folder & couldn’t find an update command

{"@type":"me.itzg.helpers.forge.ForgeManifest","timestamp":"2024-09-27T17:36:03.085992944Z","files":null,"minecraftVersion":"1.20.1","forgeVersion":"47.3.6","serverEntry":"run.sh"}