diff --git a/src/Diffs.csproj b/src/Diffs.csproj
index 7bf3cf8..286e3c5 100644
--- a/src/Diffs.csproj
+++ b/src/Diffs.csproj
@@ -4,7 +4,7 @@
     <TargetFrameworks>net8.0;netstandard2.0</TargetFrameworks>
     <RootNamespace>spkl.Diffs</RootNamespace>
     <AssemblyName>spkl.Diffs</AssemblyName>
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>13.0</LangVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Authors>Sebastian Fischer</Authors>
     <Company>Sebastian Fischer</Company>
diff --git a/test/Diffs.Test.csproj b/test/Diffs.Test.csproj
index df8bf81..0c7ab0e 100644
--- a/test/Diffs.Test.csproj
+++ b/test/Diffs.Test.csproj
@@ -6,11 +6,11 @@
     <IsPackable>false</IsPackable>
     <AssemblyName>spkl.Diffs.Test</AssemblyName>
     <RootNamespace>spkl.Diffs.Test</RootNamespace>
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>13.0</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="4.5.1" />
+    <PackageReference Include="NUnit" Version="4.6.1" />
     <PackageReference Include="NUnit.Analyzers" Version="4.14.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>