diff --git a/Serwer/Serwer.Tests/Serwer.Tests.csproj b/Serwer/Serwer.Tests/Serwer.Tests.csproj
index 8789161..5b1791f 100644
--- a/Serwer/Serwer.Tests/Serwer.Tests.csproj
+++ b/Serwer/Serwer.Tests/Serwer.Tests.csproj
@@ -1,19 +1,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
     <PackageReference Include="xunit" Version="2.4.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\Serwer\Serwer.csproj" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" />
   </ItemGroup>
 
 </Project>