diff --git a/backend/Directory.Packages.props b/backend/Directory.Packages.props
index b475613..b920f64 100644
--- a/backend/Directory.Packages.props
+++ b/backend/Directory.Packages.props
@@ -45,7 +45,7 @@
     <PackageVersion Include="NSubstitute" Version="6.0.0" />
     <PackageVersion Include="Scalar.AspNetCore" Version="2.16.17" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="4.0.0" />
     <!-- ServicesService.PersistenceTests only (docs/adr/0019) - EF Core
          InMemory, no Postgres/Docker, deliberately outside the *.Tests
          Domain+Application-only boundary and its coverage gate -->