diff --git a/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Contents/WorkflowTests.cs b/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Contents/WorkflowTests.cs
index 0e1a5071c..62b028a80 100644
--- a/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Contents/WorkflowTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Core.Tests/Model/Contents/WorkflowTests.cs
@@ -8,7 +8,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Squidex.Domain.Apps.Core.Contents;
-using Squidex.Infrastructure.Collections;
 using Xunit;
 
 namespace Squidex.Domain.Apps.Core.Model.Contents
diff --git a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Contents/DynamicContentWorkflowTests.cs b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Contents/DynamicContentWorkflowTests.cs
index 0e4b443a7..acbe685bd 100644
--- a/backend/tests/Squidex.Domain.Apps.Entities.Tests/Contents/DynamicContentWorkflowTests.cs
+++ b/backend/tests/Squidex.Domain.Apps.Entities.Tests/Contents/DynamicContentWorkflowTests.cs
@@ -7,7 +7,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 using FakeItEasy;
 using FluentAssertions;
@@ -16,7 +15,6 @@ using Squidex.Domain.Apps.Core.Scripting;
 using Squidex.Domain.Apps.Entities.Apps;
 using Squidex.Domain.Apps.Entities.TestHelpers;
 using Squidex.Infrastructure;
-using Squidex.Infrastructure.Collections;
 using Xunit;
 
 namespace Squidex.Domain.Apps.Entities.Contents