diff --git a/csharp/.gitignore b/csharp/.gitignore
index 50540f5..ffc7a53 100644
--- a/csharp/.gitignore
+++ b/csharp/.gitignore
@@ -8,3 +8,6 @@
 
 ### NuGet ###
 **/packages/*
+
+### Rider
+.idea
diff --git a/csharp/FunctionalRefactoring.Tests/FunctionalRefactoring.Tests.csproj b/csharp/FunctionalRefactoring.Tests/FunctionalRefactoring.Tests.csproj
index a2ac195..ceb0cf1 100644
--- a/csharp/FunctionalRefactoring.Tests/FunctionalRefactoring.Tests.csproj
+++ b/csharp/FunctionalRefactoring.Tests/FunctionalRefactoring.Tests.csproj
@@ -1,19 +1,24 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>net5.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
+
+    <LangVersion>9</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
-    <PackageReference Include="xunit" Version="2.4.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\FunctionalRefactoring\FunctionalRefactoring.csproj" />
+  <ItemGroup>
+    <ProjectReference Include="..\FunctionalRefactoring\FunctionalRefactoring.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/csharp/FunctionalRefactoring/FunctionalRefactoring.csproj b/csharp/FunctionalRefactoring/FunctionalRefactoring.csproj
index 72764a6..80da038 100644
--- a/csharp/FunctionalRefactoring/FunctionalRefactoring.csproj
+++ b/csharp/FunctionalRefactoring/FunctionalRefactoring.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFramework>net5.0</TargetFramework>
+    <LangVersion>9</LangVersion>
   </PropertyGroup>
 
 </Project>