diff --git a/tests/ExcelFinancialFunctions.Tests/ExcelFinancialFunctions.Tests.fsproj b/tests/ExcelFinancialFunctions.Tests/ExcelFinancialFunctions.Tests.fsproj
index cee8f2f..c2d68eb 100644
--- a/tests/ExcelFinancialFunctions.Tests/ExcelFinancialFunctions.Tests.fsproj
+++ b/tests/ExcelFinancialFunctions.Tests/ExcelFinancialFunctions.Tests.fsproj
@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="FsCheck" Version="2.16.5" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit" Version="4.0.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="coverlet.collector" Version="6.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>