diff --git a/.github/workflows/pack.yml b/.github/workflows/pack.yml
index 5e45cac23..260440e46 100644
--- a/.github/workflows/pack.yml
+++ b/.github/workflows/pack.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.403
+        dotnet-version: 5.0.100
 
     - name: Publish to Nuget
       env: 
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index ddaeaf093..32646cd66 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.402
+        dotnet-version: 5.0.100
 
     - name: Publish wasm
       run: |
diff --git a/src/BootstrapBlazor.Docs/BootstrapBlazor.Docs.csproj b/src/BootstrapBlazor.Docs/BootstrapBlazor.Docs.csproj
index b5a17fd31..ae73cd740 100644
--- a/src/BootstrapBlazor.Docs/BootstrapBlazor.Docs.csproj
+++ b/src/BootstrapBlazor.Docs/BootstrapBlazor.Docs.csproj
@@ -1,9 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
     <PropertyGroup>
-        <TargetFramework>netstandard2.1</TargetFramework>
-        <OutputType>Library</OutputType>
-        <RazorLangVersion>3.0</RazorLangVersion>
+        <TargetFramework>net5.0</TargetFramework>
     </PropertyGroup>
 
+    <ItemGroup>
+        <SupportedPlatform Include="browser" />
+    </ItemGroup>
+    
 </Project>
diff --git a/src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj b/src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj
index a7db9b53a..0fcf7edab 100644
--- a/src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj
+++ b/src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj
@@ -1,10 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <TargetFramework>net5.0</TargetFramework>
         <IsWebProject>true</IsWebProject>
     </PropertyGroup>
 
+    <ItemGroup>
+        <SupportedPlatform Include="browser" />
+    </ItemGroup>
+
     <ItemGroup>
         <PackageReference Include="Longbow.Tasks" Version="3.1.1" />
     </ItemGroup>
diff --git a/src/BootstrapBlazor.Shared/BootstrapBlazor.Shared.csproj b/src/BootstrapBlazor.Shared/BootstrapBlazor.Shared.csproj
index c2c0c9a29..f87e65a26 100644
--- a/src/BootstrapBlazor.Shared/BootstrapBlazor.Shared.csproj
+++ b/src/BootstrapBlazor.Shared/BootstrapBlazor.Shared.csproj
@@ -1,18 +1,20 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
     <PropertyGroup>
-        <TargetFramework>netstandard2.1</TargetFramework>
-        <OutputType>Library</OutputType>
-        <RazorLangVersion>3.0</RazorLangVersion>
+        <TargetFramework>net5.0</TargetFramework>
         <IsPackable>true</IsPackable>
-        <Version>3.1.0</Version>
+        <Version>5.0.0</Version>
     </PropertyGroup>
 
+    <ItemGroup>
+        <SupportedPlatform Include="browser" />
+    </ItemGroup>
+    
     <ItemGroup>
         <PackageReference Include="BootstrapBlazor.Chart" Version="3.1.1" />
         <PackageReference Include="BootstrapBlazor.Markdown" Version="3.1.1" />
         <PackageReference Include="BootstrapBlazor.TableExport" Version="3.1.1" />
-        <PackageReference Include="System.Net.Http.Json" Version="3.2.1" />
+        <PackageReference Include="System.Net.Http.Json" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/BootstrapBlazor.WebAssembly.ClientHost/BootstrapBlazor.WebAssembly.ClientHost.csproj b/src/BootstrapBlazor.WebAssembly.ClientHost/BootstrapBlazor.WebAssembly.ClientHost.csproj
index 37863aca1..1dc67bdf2 100644
--- a/src/BootstrapBlazor.WebAssembly.ClientHost/BootstrapBlazor.WebAssembly.ClientHost.csproj
+++ b/src/BootstrapBlazor.WebAssembly.ClientHost/BootstrapBlazor.WebAssembly.ClientHost.csproj
@@ -1,16 +1,14 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
 
     <PropertyGroup>
-        <TargetFramework>netstandard2.1</TargetFramework>
-        <RazorLangVersion>3.0</RazorLangVersion>
+        <TargetFramework>net5.0</TargetFramework>
         <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="3.2.1" />
-        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Build" Version="3.2.1" PrivateAssets="all" />
-        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="3.2.1" PrivateAssets="all" />
-        <PackageReference Include="System.Net.Http.Json" Version="3.2.1" />
+        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="5.0.0" />
+        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="5.0.0" PrivateAssets="all" />
+        <PackageReference Include="System.Net.Http.Json" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>
@@ -18,8 +16,8 @@
     </ItemGroup>
 
     <ItemGroup>
-      <Content Include="..\BootstrapBlazor.Server\wwwroot\favicon.ico" Link="wwwroot\favicon.ico" />
-      <Content Include="..\BootstrapBlazor.Server\wwwroot\favicon.png" Link="wwwroot\favicon.png" />
+        <Content Include="..\BootstrapBlazor.Server\wwwroot\favicon.ico" Link="wwwroot\favicon.ico" />
+        <Content Include="..\BootstrapBlazor.Server\wwwroot\favicon.png" Link="wwwroot\favicon.png" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/BootstrapBlazor.WebAssembly.ServerHost/BootstrapBlazor.WebAssembly.ServerHost.csproj b/src/BootstrapBlazor.WebAssembly.ServerHost/BootstrapBlazor.WebAssembly.ServerHost.csproj
index 61169fb7c..3ac5ccbec 100644
--- a/src/BootstrapBlazor.WebAssembly.ServerHost/BootstrapBlazor.WebAssembly.ServerHost.csproj
+++ b/src/BootstrapBlazor.WebAssembly.ServerHost/BootstrapBlazor.WebAssembly.ServerHost.csproj
@@ -1,12 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <TargetFramework>net5.0</TargetFramework>
         <IsWebProject>true</IsWebProject>
     </PropertyGroup>
-
+    
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="3.2.1" />
+        <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/BootstrapBlazor/BootstrapBlazor.csproj b/src/BootstrapBlazor/BootstrapBlazor.csproj
index 9fa2e1eed..3d4e9df96 100644
--- a/src/BootstrapBlazor/BootstrapBlazor.csproj
+++ b/src/BootstrapBlazor/BootstrapBlazor.csproj
@@ -1,19 +1,21 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
     <PropertyGroup>
-        <TargetFramework>netstandard2.1</TargetFramework>
-        <OutputType>Library</OutputType>
-        <RazorLangVersion>3.0</RazorLangVersion>
+        <TargetFramework>net5.0</TargetFramework>
         <IsPackable>true</IsPackable>
         <PackageIcon>logo.png</PackageIcon>
-        <Version>3.1.29-beta02</Version>
+        <Version>5.0.0-beta01</Version>
         <PackageReleaseNotes>更新日志：https://gitee.com/LongbowEnterprise/BootstrapBlazor/wikis</PackageReleaseNotes>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="3.1.9" />
-        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.9" />
-        <PackageReference Include="Microsoft.Extensions.Localization" Version="3.1.9" />
+        <SupportedPlatform Include="browser" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="5.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0" />
+        <PackageReference Include="Microsoft.Extensions.Localization" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/BootstrapBlazor/Localization/Json/Internal/StringLocalizer.cs b/src/BootstrapBlazor/Localization/Json/Internal/StringLocalizer.cs
index 2d3feac8f..1ec089ffc 100644
--- a/src/BootstrapBlazor/Localization/Json/Internal/StringLocalizer.cs
+++ b/src/BootstrapBlazor/Localization/Json/Internal/StringLocalizer.cs
@@ -1,7 +1,5 @@
 using Microsoft.Extensions.Localization;
-using System;
 using System.Collections.Generic;
-using System.Globalization;
 
 namespace BootstrapBlazor.Localization.Json
 {
@@ -22,8 +20,5 @@ namespace BootstrapBlazor.Localization.Json
         public LocalizedString this[string name, params object[] arguments] => _localizer[name, arguments];
 
         public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures) => _localizer.GetAllStrings(includeParentCultures);
-
-        [Obsolete("This method is obsolete. Use `CurrentCulture` and `CurrentUICulture` instead.")]
-        public IStringLocalizer WithCulture(CultureInfo culture) => _localizer.WithCulture(culture);
     }
 }
diff --git a/test/UnitTest/UnitTest.csproj b/test/UnitTest/UnitTest.csproj
index aa1a8f782..deba05655 100644
--- a/test/UnitTest/UnitTest.csproj
+++ b/test/UnitTest/UnitTest.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <TargetFramework>net5.0</TargetFramework>
         <IsPackable>false</IsPackable>
     </PropertyGroup>