diff --git a/Sharp7.Rx.Tests/Sharp7.Rx.Tests.csproj b/Sharp7.Rx.Tests/Sharp7.Rx.Tests.csproj
index 8eb3805..d1de65b 100644
--- a/Sharp7.Rx.Tests/Sharp7.Rx.Tests.csproj
+++ b/Sharp7.Rx.Tests/Sharp7.Rx.Tests.csproj
@@ -1,18 +1,22 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-	<PropertyGroup>
-		<TargetFramework>net8.0</TargetFramework>
-	</PropertyGroup>
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <LangVersion>12.0</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AnalysisLevel>latest-Recommended</AnalysisLevel>
+  </PropertyGroup>
 
-	<ItemGroup>
-		<PackageReference Include="DeepEqual" Version="4.2.1" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-		<PackageReference Include="NUnit" Version="4.0.1" />
-		<PackageReference Include="Shouldly" Version="4.2.1" />
-	</ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="DeepEqual" Version="4.2.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="Shouldly" Version="4.2.1" />
+  </ItemGroup>
 
-	<ItemGroup>
-		<ProjectReference Include="..\Sharp7.Rx\Sharp7.Rx.csproj" />
-	</ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Sharp7.Rx\Sharp7.Rx.csproj" />
+  </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>
diff --git a/Sharp7.Rx/Sharp7.Rx.csproj b/Sharp7.Rx/Sharp7.Rx.csproj
index 11fce0d..3b73209 100644
--- a/Sharp7.Rx/Sharp7.Rx.csproj
+++ b/Sharp7.Rx/Sharp7.Rx.csproj
@@ -2,6 +2,12 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
+
+    <LangVersion>12.0</LangVersion>
+    <Nullable>disable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AnalysisLevel>latest-Recommended</AnalysisLevel>
+
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     <Authors>evopro system engineering AG</Authors>