diff --git a/TelnetNegotiationCore.UnitTests/TelnetNegotiationCore.UnitTests.csproj b/TelnetNegotiationCore.UnitTests/TelnetNegotiationCore.UnitTests.csproj
index 21281e1..35d44aa 100644
--- a/TelnetNegotiationCore.UnitTests/TelnetNegotiationCore.UnitTests.csproj
+++ b/TelnetNegotiationCore.UnitTests/TelnetNegotiationCore.UnitTests.csproj
@@ -16,7 +16,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />
-    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit" Version="4.1.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />