diff --git a/Gu.Wpf.NumericInput.Tests/Gu.Wpf.NumericInput.Tests.csproj b/Gu.Wpf.NumericInput.Tests/Gu.Wpf.NumericInput.Tests.csproj
index 6eb3744..37e31aa 100644
--- a/Gu.Wpf.NumericInput.Tests/Gu.Wpf.NumericInput.Tests.csproj
+++ b/Gu.Wpf.NumericInput.Tests/Gu.Wpf.NumericInput.Tests.csproj
@@ -26,7 +26,7 @@
     <PackageReference Include="Gu.Analyzers" Version="2.0.3" PrivateAssets="all" />
     <PackageReference Include="IDisposableAnalyzers" Version="4.0.7" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.0.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" PrivateAssets="all" />
     <PackageReference Include="PropertyChangedAnalyzers" Version="4.0.0" PrivateAssets="all" />
     <PackageReference Include="ReflectionAnalyzers" Version="0.3.1" PrivateAssets="all" />