diff --git a/src/NServiceBus.Storage.MongoDB.Tests/NServiceBus.Storage.MongoDB.Tests.csproj b/src/NServiceBus.Storage.MongoDB.Tests/NServiceBus.Storage.MongoDB.Tests.csproj
index 348b5d28..919a9392 100644
--- a/src/NServiceBus.Storage.MongoDB.Tests/NServiceBus.Storage.MongoDB.Tests.csproj
+++ b/src/NServiceBus.Storage.MongoDB.Tests/NServiceBus.Storage.MongoDB.Tests.csproj
@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="MongoDB.Driver" Version="2.19.2" />
     <PackageReference Include="NServiceBus" Version="9.0.0-alpha.6" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.1.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Particular.Approvals" Version="1.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.1.0" />
diff --git a/src/NServiceBus.Storage.MongoDB.TransactionalSession.Tests/NServiceBus.Storage.MongoDB.TransactionalSession.Tests.csproj b/src/NServiceBus.Storage.MongoDB.TransactionalSession.Tests/NServiceBus.Storage.MongoDB.TransactionalSession.Tests.csproj
index c36e4cfd..efb93b51 100644
--- a/src/NServiceBus.Storage.MongoDB.TransactionalSession.Tests/NServiceBus.Storage.MongoDB.TransactionalSession.Tests.csproj
+++ b/src/NServiceBus.Storage.MongoDB.TransactionalSession.Tests/NServiceBus.Storage.MongoDB.TransactionalSession.Tests.csproj
@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="2.3.3" />
     <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" />
   </ItemGroup>