diff --git a/X10D.Tests/src/Drawing/PointFTests.cs b/X10D.Tests/src/Drawing/PointFTests.cs
index a21cb2b..db74ae3 100644
--- a/X10D.Tests/src/Drawing/PointFTests.cs
+++ b/X10D.Tests/src/Drawing/PointFTests.cs
@@ -1,6 +1,5 @@
 using System.Drawing;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using X10D.Core;
 using X10D.Drawing;
 
 namespace X10D.Tests.Drawing;
diff --git a/X10D.Tests/src/Math/MathUtilityTests.cs b/X10D.Tests/src/Math/MathUtilityTests.cs
index 97b27c8..3e4bf52 100644
--- a/X10D.Tests/src/Math/MathUtilityTests.cs
+++ b/X10D.Tests/src/Math/MathUtilityTests.cs
@@ -1,5 +1,4 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using X10D.Core;
 using X10D.Math;
 
 namespace X10D.Tests.Math;