diff --git a/Pomo-Shiny/App.config b/Pomo-Shiny/App.config
deleted file mode 100644
index 56efbc7..0000000
--- a/Pomo-Shiny/App.config
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
-    </startup>
-</configuration>
\ No newline at end of file
diff --git a/Pomo-Shiny/App.xaml b/Pomo-Shiny/App.xaml
index 6b812e3..713b9ea 100644
--- a/Pomo-Shiny/App.xaml
+++ b/Pomo-Shiny/App.xaml
@@ -1,8 +1,6 @@
 <Application x:Class="Pomo_Shiny.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:Pomo_Shiny"
-             StartupUri="MainWindow.xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <Application.Resources>
 
         <ResourceDictionary>
diff --git a/Pomo-Shiny/App.xaml.cs b/Pomo-Shiny/App.xaml.cs
index 51b297d..1848050 100644
--- a/Pomo-Shiny/App.xaml.cs
+++ b/Pomo-Shiny/App.xaml.cs
@@ -1,16 +1,46 @@
 using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Linq;
-using System.Threading.Tasks;
+using System.IO;
 using System.Windows;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace Pomo_Shiny
 {
     /// <summary>
-    /// Interaction logic for App.xaml
+    ///     Interaction logic for App.xaml
     /// </summary>
     public partial class App : Application
     {
+        private IServiceProvider ServiceProvider { get; set; }
+        private IConfiguration Configuration { get; set; }
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            var builder = new ConfigurationBuilder()
+                .SetBasePath(Directory.GetCurrentDirectory())
+                .AddJsonFile("appsettings.json", false, true);
+
+            Configuration = builder.Build();
+
+            var services = new ServiceCollection();
+            ConfigureServices(services);
+
+            ServiceProvider = services.BuildServiceProvider();
+
+            var mainWindow = ServiceProvider.GetRequiredService<MainWindow>();
+            mainWindow.Show();
+        }
+
+        private void ConfigureServices(IServiceCollection services)
+        {
+            services.AddTransient<IApplicationAccessor, ApplicationAccessor>();
+            services.AddTransient<ICountdownTimer, CountdownTimer>();
+            services.AddTransient<ITimerFacade, TimerFacade>();
+            services.AddTransient<ISoundProvider, SoundProvider>();
+            services.AddTransient<MainWindowViewModel>();
+            services.AddTransient<MainWindow>();
+
+            services.Configure<AppSettings>(Configuration.GetSection(nameof(AppSettings)));
+        }
     }
-}
+}
\ No newline at end of file
diff --git a/Pomo-Shiny/AppSettings.cs b/Pomo-Shiny/AppSettings.cs
new file mode 100644
index 0000000..4454d46
--- /dev/null
+++ b/Pomo-Shiny/AppSettings.cs
@@ -0,0 +1,9 @@
+using Microsoft.Extensions.Configuration;
+
+namespace Pomo_Shiny
+{
+    public class AppSettings
+    {
+        public bool IsSoundOn { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/Pomo-Shiny/MainWindow.xaml.cs b/Pomo-Shiny/MainWindow.xaml.cs
index cb558b9..cef5cf9 100644
--- a/Pomo-Shiny/MainWindow.xaml.cs
+++ b/Pomo-Shiny/MainWindow.xaml.cs
@@ -1,4 +1,5 @@
-using System.Diagnostics.CodeAnalysis;
+using System.Configuration;
+using System.Diagnostics.CodeAnalysis;
 using System.Windows;
 using System.Windows.Input;
 
@@ -10,10 +11,9 @@ namespace Pomo_Shiny
     [ExcludeFromCodeCoverage]
     public partial class MainWindow : Window
     {
-        public MainWindow()
+        public MainWindow(MainWindowViewModel mainWindowViewModel)
         {
-            DataContext = new MainWindowViewModel(new ApplicationAccessor(),
-                new CountdownTimer(new TimerFacade(), new SoundProvider()));
+            DataContext = mainWindowViewModel;
             InitializeComponent();
         }
 
diff --git a/Pomo-Shiny/MainWindowViewModel.cs b/Pomo-Shiny/MainWindowViewModel.cs
index 342f39b..44db40a 100644
--- a/Pomo-Shiny/MainWindowViewModel.cs
+++ b/Pomo-Shiny/MainWindowViewModel.cs
@@ -1,5 +1,7 @@
-using System;
+using Microsoft.Extensions.Configuration;
+using System;
 using System.Windows.Input;
+using Microsoft.Extensions.Options;
 
 namespace Pomo_Shiny
 {
@@ -7,12 +9,14 @@ public class MainWindowViewModel : ObservableObject
     {
         private readonly IApplicationAccessor _applicationAccessor;
         private readonly ICountdownTimer _countdownTimer;
+        private readonly AppSettings _appSettings;
         private TimeSpan _remainingTime;
 
-        public MainWindowViewModel(IApplicationAccessor applicationAccessor, ICountdownTimer countdownTimer)
+        public MainWindowViewModel(IApplicationAccessor applicationAccessor, ICountdownTimer countdownTimer, IOptions<AppSettings> appSettings)
         {
             _applicationAccessor = applicationAccessor;
             _countdownTimer = countdownTimer;
+            _appSettings = appSettings.Value;
             _countdownTimer.Callback = val => RemainingTime = val;
 
             ExitCommand = new DelegateCommand(Exit);
@@ -48,7 +52,7 @@ private set
 
         private void StartTimer()
         {
-            _countdownTimer.StartCountdown(25, false);
+            _countdownTimer.StartCountdown(25, _appSettings.IsSoundOn);
         }
 
         private void StopTimer()
@@ -58,7 +62,7 @@ private void StopTimer()
 
         private void StartBreakTimer()
         {
-            _countdownTimer.StartCountdown(5, false);
+            _countdownTimer.StartCountdown(5, _appSettings.IsSoundOn);
         }
 
         private void Exit()
diff --git a/Pomo-Shiny/Pomo-Shiny.csproj b/Pomo-Shiny/Pomo-Shiny.csproj
index 66563e2..07efabf 100644
--- a/Pomo-Shiny/Pomo-Shiny.csproj
+++ b/Pomo-Shiny/Pomo-Shiny.csproj
@@ -2,19 +2,23 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Pomo_Shiny</RootNamespace>
     <UseWPF>true</UseWPF>
   </PropertyGroup>
 
   <ItemGroup>
-    <None Remove="Media\unicorn2.png" />
-    <None Remove="Media\unicorn2_Pyo_12.ico" />
+    <Content Include="appsettings.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Resource Include="Media\unicorn2.png" />
+    <Resource Include="Media\unicorn2_Pyo_12.ico" />
   </ItemGroup>
 
   <ItemGroup>
-    <Resource Include="Media\unicorn2.png" />
-    <Resource Include="Media\unicorn2_Pyo_12.ico" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="3.1.1" />
   </ItemGroup>
 
 </Project>
\ No newline at end of file
diff --git a/Pomo-Shiny/appsettings.json b/Pomo-Shiny/appsettings.json
new file mode 100644
index 0000000..5ff2ef4
--- /dev/null
+++ b/Pomo-Shiny/appsettings.json
@@ -0,0 +1,5 @@
+{
+  "AppSettings": {
+    "SoundOn": false
+  }
+}
\ No newline at end of file
diff --git a/Tests/MainWindowViewModelTests.cs b/Tests/MainWindowViewModelTests.cs
index 9f072f2..bd8363d 100644
--- a/Tests/MainWindowViewModelTests.cs
+++ b/Tests/MainWindowViewModelTests.cs
@@ -1,5 +1,6 @@
 using System;
 using FakeItEasy;
+using Microsoft.Extensions.Options;
 using NUnit.Framework;
 using Pomo_Shiny;
 
@@ -10,13 +11,16 @@ public class MainWindowViewModelTests
         private IApplicationAccessor _fakeApplicationAccessor;
         private ICountdownTimer _fakeCountdownTimer;
         private MainWindowViewModel _sut;
+        private IOptions<AppSettings> _fakeAppSettings;
 
         [SetUp]
         public void Setup()
         {
             _fakeApplicationAccessor = A.Fake<IApplicationAccessor>();
             _fakeCountdownTimer = A.Fake<ICountdownTimer>();
-            _sut = new MainWindowViewModel(_fakeApplicationAccessor, _fakeCountdownTimer);
+            _fakeAppSettings = A.Fake<IOptions<AppSettings>>();
+
+            _sut = new MainWindowViewModel(_fakeApplicationAccessor, _fakeCountdownTimer, _fakeAppSettings);
         }
 
         [Test]
@@ -32,7 +36,7 @@ public void StartTimerCommand_starts_timer_for_25_minutes()
         {
             _sut.StartTimerCommand.Execute(null);
 
-            A.CallTo(() => _fakeCountdownTimer.StartCountdown(25, false)).MustHaveHappened();
+            A.CallTo(() => _fakeCountdownTimer.StartCountdown(25, A<bool>._)).MustHaveHappened();
         }
 
         [Test]
@@ -40,7 +44,7 @@ public void StartBreakTimerCommand_starts_timer_for_5_minutes()
         {
             _sut.StartBreakTimerCommand.Execute(null);
 
-            A.CallTo(() => _fakeCountdownTimer.StartCountdown(5, false)).MustHaveHappened();
+            A.CallTo(() => _fakeCountdownTimer.StartCountdown(5, A<bool>._)).MustHaveHappened();
         }
 
         [Test]
@@ -102,5 +106,25 @@ public void Title_depends_on_PercentageToGo(double value, string expectedTitle)
             A.CallTo(() => _fakeCountdownTimer.PercentageToGo).Returns(value);
             Assert.AreEqual(expectedTitle, _sut.Title);
         }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void StartTimerCountdown_sound_controlled_by_config(bool soundIsOn)
+        {
+            _fakeAppSettings.Value.IsSoundOn = soundIsOn;
+
+            _sut.StartTimerCommand.Execute(null);
+            A.CallTo(() => _fakeCountdownTimer.StartCountdown(25, soundIsOn)).MustHaveHappened();
+        }
+
+        [TestCase(true)]
+        [TestCase(false)]
+        public void StartBreakTimerCountdown_sound_controlled_by_config(bool soundIsOn)
+        {
+            _fakeAppSettings.Value.IsSoundOn = soundIsOn;
+
+            _sut.StartBreakTimerCommand.Execute(null);
+            A.CallTo(() => _fakeCountdownTimer.StartCountdown(5, soundIsOn)).MustHaveHappened();
+        }
     }
 }
\ No newline at end of file
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index 52502ba..85bcba8 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -1,13 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="FakeItEasy" Version="5.4.0" />
+    <PackageReference Include="FluentAssertions" Version="5.10.0" />
     <PackageReference Include="nunit" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />