diff --git a/src/modules/launcher/PowerLauncher/App.xaml.cs b/src/modules/launcher/PowerLauncher/App.xaml.cs
index ddb31eb437..948e76ebb3 100644
--- a/src/modules/launcher/PowerLauncher/App.xaml.cs
+++ b/src/modules/launcher/PowerLauncher/App.xaml.cs
@@ -18,7 +18,6 @@ using PowerLauncher.Plugin;
 using PowerLauncher.ViewModel;
 using Wox;
 using Wox.Infrastructure;
-using Wox.Infrastructure.Http;
 using Wox.Infrastructure.Image;
 using Wox.Infrastructure.UserSettings;
 using Wox.Plugin;
@@ -129,9 +128,6 @@ namespace PowerLauncher
                 Current.MainWindow = _mainWindow;
                 Current.MainWindow.Title = Constant.ExeFileName;
 
-                // main windows needs initialized before theme change because of blur settings
-                HttpClient.Proxy = _settings.Proxy;
-
                 RegisterExitEvents();
 
                 _settingsReader.ReadSettingsOnChange();
diff --git a/src/modules/launcher/Wox.Infrastructure/Http/HttpClient.cs b/src/modules/launcher/Wox.Infrastructure/Http/HttpClient.cs
deleted file mode 100644
index 6ebeeeaef2..0000000000
--- a/src/modules/launcher/Wox.Infrastructure/Http/HttpClient.cs
+++ /dev/null
@@ -1,61 +0,0 @@
-// Copyright (c) Microsoft Corporation
-// The Microsoft Corporation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-using System;
-using System.IO;
-using System.Net;
-using System.Net.Http;
-using System.Reflection;
-using System.Text;
-using System.Threading.Tasks;
-using JetBrains.Annotations;
-using Wox.Infrastructure.UserSettings;
-using Wox.Plugin.Logger;
-
-namespace Wox.Infrastructure.Http
-{
-    public static class HttpClient
-    {
-        private const string UserAgent = @"Mozilla/5.0 (Trident/7.0; rv:11.0) like Gecko";
-
-        public static HttpProxy Proxy { get; set; }
-
-        public static IWebProxy WebProxy()
-        {
-            if (Proxy != null && Proxy.Enabled && !string.IsNullOrEmpty(Proxy.Server))
-            {
-                if (string.IsNullOrEmpty(Proxy.UserName) || string.IsNullOrEmpty(Proxy.Password))
-                {
-                    var webProxy = new WebProxy(Proxy.Server, Proxy.Port);
-                    return webProxy;
-                }
-                else
-                {
-                    var webProxy = new WebProxy(Proxy.Server, Proxy.Port)
-                    {
-                        Credentials = new NetworkCredential(Proxy.UserName, Proxy.Password),
-                    };
-                    return webProxy;
-                }
-            }
-            else
-            {
-                return WebRequest.GetSystemWebProxy();
-            }
-        }
-
-        public static void Download([NotNull] Uri url, [NotNull] string filePath)
-        {
-            if (url == null)
-            {
-                throw new ArgumentNullException(nameof(url));
-            }
-
-            var client = new WebClient { Proxy = WebProxy() };
-            client.Headers.Add("user-agent", UserAgent);
-            client.DownloadFile(url.AbsoluteUri, filePath);
-            client.Dispose();
-        }
-    }
-}
diff --git a/src/modules/launcher/Wox.Infrastructure/Image/ImageHashGenerator.cs b/src/modules/launcher/Wox.Infrastructure/Image/ImageHashGenerator.cs
index 8c7bbe680d..dc9b576234 100644
--- a/src/modules/launcher/Wox.Infrastructure/Image/ImageHashGenerator.cs
+++ b/src/modules/launcher/Wox.Infrastructure/Image/ImageHashGenerator.cs
@@ -35,7 +35,8 @@ namespace Wox.Infrastructure.Image
                     enc.Frames.Add(bitmapFrame);
                     enc.Save(outStream);
                     var byteArray = outStream.GetBuffer();
-                    using (var sha1 = new SHA1CryptoServiceProvider())
+
+                    using (var sha1 = SHA1.Create())
                     {
                         var hash = Convert.ToBase64String(sha1.ComputeHash(byteArray));
                         return hash;
diff --git a/src/modules/launcher/Wox.Infrastructure/Storage/JsonStorage`1.cs b/src/modules/launcher/Wox.Infrastructure/Storage/JsonStorage`1.cs
index 12088202fe..9181364855 100644
--- a/src/modules/launcher/Wox.Infrastructure/Storage/JsonStorage`1.cs
+++ b/src/modules/launcher/Wox.Infrastructure/Storage/JsonStorage`1.cs
@@ -24,7 +24,7 @@ namespace Wox.Infrastructure.Storage
         // easier and flexible for default value of object
         private static readonly JsonSerializerOptions _serializerOptions = new JsonSerializerOptions
         {
-            IgnoreNullValues = true,
+            DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull,
             IncludeFields = true,
             PropertyNameCaseInsensitive = true,
             WriteIndented = true,