diff --git a/src/Harness/Harness.csproj b/src/Harness/Harness.csproj
index 79ddda9..65b66dc 100644
--- a/src/Harness/Harness.csproj
+++ b/src/Harness/Harness.csproj
@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="GraphQL.Server.Transports.AspNetCore.SystemTextJson" Version="5.0.0" />
     <PackageReference Include="GraphQL.Server.Ui.GraphiQL" Version="5.0.0" />
-    <PackageReference Include="GraphQL.Server.Ui.Playground" Version="5.0.0" />
+    <PackageReference Include="GraphQL.Server.Ui.Playground" Version="6.0.0" />
     <PackageReference Include="GraphQL.Server.Transports.AspNetCore" Version="5.0.0" />
   </ItemGroup>