diff --git a/WpfCopyDeploy.Tests/WpfCopyDeploy.Tests.csproj b/WpfCopyDeploy.Tests/WpfCopyDeploy.Tests.csproj
index bcf5dae..a1bae56 100644
--- a/WpfCopyDeploy.Tests/WpfCopyDeploy.Tests.csproj
+++ b/WpfCopyDeploy.Tests/WpfCopyDeploy.Tests.csproj
@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="IDisposableAnalyzers" Version="4.0.7" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.1.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="ReflectionAnalyzers" Version="0.3.1" PrivateAssets="all" />
     <PackageReference Include="System.Reactive" Version="6.0.0" />