A function app runs on a specific version of the Azure Functions runtime. There have been four major versions: 4.x, 3.x, 2.x, and 1.x. By default, function apps are created in version 4.x of the runtime.
Update via Azure Portal
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We need to restart the Function App after changing the runtime.
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Update via Powershell
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--Check the runtime
Get-AzFunctionAppSetting -Name "<FUNCTION_APP>" -ResourceGroupName "<RESOURCE_GROUP>"
--Update the runtime
Update-AzFunctionAppSetting -Name "<FUNCTION_APP>" -ResourceGroupName "<RESOURCE_GROUP>" -AppSetting @{"FUNCTIONS_EXTENSION_VERSION" = "<VERSION>"} -Force |