.NET Core - Serilog - IHostBuilder does not contain a definiton of UseSerilog()

trying to follow this tutorial : https://nblumhardt.com/2019/10/serilog-in-aspnetcore-3/

I managed to add the Serilog to my app (.NET Core 3.1)

but I cannot modify the CreateHostBuilder function, since it does not recognize UseSerilog() function

I have checked for a solution, but everyone seems to use that code

using System;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Serilog;

namespace MyApi
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Log.Logger = new LoggerConfiguration()
            .Enrich.FromLogContext()
            .WriteTo.Console()
            .CreateLogger();

            try
            {
                Log.Information("Starting up");
                CreateHostBuilder(args).Build().Run();
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Application start-up failed");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }
                
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .UseSerilog() // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< unknown function
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}

what am I missing here ?

thanks for your help

Answer provided by Alex Lyalka : packages were missing

dotnet add package Serilog.AspNetCore