diff --git a/tests/UTF-unknown.Tests.csproj b/tests/UTF-unknown.Tests.csproj
index 00a7bb1..5f01237 100644
--- a/tests/UTF-unknown.Tests.csproj
+++ b/tests/UTF-unknown.Tests.csproj
@@ -13,7 +13,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="NUnit" Version="4.6.1" />
+    <PackageReference Include="NUnit" Version="5.0.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
   </ItemGroup>