diff --git a/src/Blazor.Diagrams.Core/Models/NodeModel.cs b/src/Blazor.Diagrams.Core/Models/NodeModel.cs
index 610a5aac..102a9fed 100644
--- a/src/Blazor.Diagrams.Core/Models/NodeModel.cs
+++ b/src/Blazor.Diagrams.Core/Models/NodeModel.cs
@@ -107,7 +107,13 @@ public void SetSize(double width, double height)
         if (newSize.Equals(_size) == true)
             return;
 
+        Size? oldSize = Size != null ? new Size(Size.Width, Size.Height) : null;
+
         Size = newSize;
+        if (oldSize != null)
+        {
+            UpdatePortPositions(oldSize, newSize);
+        }
         Refresh();
         RefreshLinks();
         SizeChanging?.Invoke(this);
@@ -156,6 +162,9 @@ public virtual void UpdatePositionSilently(double deltaX, double deltaY)
 
     public virtual bool CanAttachTo(ILinkable other) => other is not PortModel && other is not BaseLinkModel;
 
+    /// <summary>
+    /// Updates port positions when node position changes.
+    /// </summary>
     private void UpdatePortPositions(double deltaX, double deltaY)
     {
         // Save some JS calls and update ports directly here
@@ -166,6 +175,21 @@ private void UpdatePortPositions(double deltaX, double deltaY)
         }
     }
 
+    /// <summary>
+    /// Updates port positions when node size changes.
+    /// </summary>
+    private void UpdatePortPositions(Size oldSize, Size newSize)
+    {
+        var deltaWidth = newSize.Width - oldSize.Width;
+        var deltaHeight = newSize.Height - oldSize.Height;
+
+        foreach (var port in _ports)
+        {
+            port.SetPortPositionOnNodeSizeChanged(deltaWidth, deltaHeight);
+            port.RefreshLinks();
+        }
+    }
+
     protected void TriggerMoving()
     {
         Moving?.Invoke(this);
diff --git a/src/Blazor.Diagrams.Core/Models/PortModel.cs b/src/Blazor.Diagrams.Core/Models/PortModel.cs
index a0c85081..ef206856 100644
--- a/src/Blazor.Diagrams.Core/Models/PortModel.cs
+++ b/src/Blazor.Diagrams.Core/Models/PortModel.cs
@@ -67,4 +67,38 @@ public virtual bool CanAttachTo(ILinkable other)
     void ILinkable.AddLink(BaseLinkModel link) => _links.Add(link);
 
     void ILinkable.RemoveLink(BaseLinkModel link) => _links.Remove(link);
+
+    public virtual void SetPortPositionOnNodeSizeChanged(double deltaWidth, double deltaHeight)
+    {
+        switch (Alignment)
+        {
+            case PortAlignment.Top:
+                Position = new Point(Position.X + deltaWidth / 2, Position.Y);
+                break;
+            case PortAlignment.TopRight:
+                Position = new Point(Position.X + deltaWidth, Position.Y);
+                break;
+            case PortAlignment.TopLeft:
+                Position = new Point(Position.X, Position.Y);
+                break;
+            case PortAlignment.Right:
+                Position = new Point(Position.X + deltaWidth, Position.Y + deltaHeight / 2);
+                break;
+            case PortAlignment.Left:
+                Position = new Point(Position.X, Position.Y + deltaHeight / 2);
+                break;
+            case PortAlignment.Bottom:
+                Position = new Point(Position.X + deltaWidth / 2, Position.Y + deltaHeight);
+                break;
+            case PortAlignment.BottomRight:
+                Position = new Point(Position.X + deltaWidth, Position.Y + deltaHeight);
+                break;
+            case PortAlignment.BottomLeft:
+                Position = new Point(Position.X, Position.Y + deltaHeight);
+                break;
+            default:
+                Position = new Point(Position.X, Position.Y);
+                break;
+        }
+    }
 }
diff --git a/tests/Blazor.Diagrams.Core.Tests/Blazor.Diagrams.Core.Tests.csproj b/tests/Blazor.Diagrams.Core.Tests/Blazor.Diagrams.Core.Tests.csproj
index 11c8ea2c..ee63923f 100644
--- a/tests/Blazor.Diagrams.Core.Tests/Blazor.Diagrams.Core.Tests.csproj
+++ b/tests/Blazor.Diagrams.Core.Tests/Blazor.Diagrams.Core.Tests.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
diff --git a/tests/Blazor.Diagrams.Core.Tests/Models/NodeModelTest.cs b/tests/Blazor.Diagrams.Core.Tests/Models/NodeModelTest.cs
new file mode 100644
index 00000000..b27edc99
--- /dev/null
+++ b/tests/Blazor.Diagrams.Core.Tests/Models/NodeModelTest.cs
@@ -0,0 +1,53 @@
+using Blazor.Diagrams.Core.Geometry;
+using Blazor.Diagrams.Core.Models;
+using Moq;
+using Xunit;
+
+namespace Blazor.Diagrams.Core.Tests.Models
+{
+    public class NodeModelTest
+    {
+        [Fact]
+        public void UpdatePortOnSetPosition()
+        {
+            var node = new NodeModel(position: new Point(100, 100));
+            node.Size = new Size(100, 100);
+
+            var port = new PortModel(node, PortAlignment.BottomLeft, new Point(50, 50));
+            node.AddPort(port);
+
+            var newX = 200;
+            var newY = 300;
+
+            //Act
+            node.SetPosition(newX, newY);
+
+            //Assert
+            Assert.Equal(150, port.Position.X);
+            Assert.Equal(250, port.Position.Y);
+        }
+
+        [Fact]
+        public void SetPortPositionOnNodeSizeChangedIsCalledOnSetSize()
+        {
+            // Arrange
+            var oldWidth = 100.0;
+            var oldHeight = 100.0;
+            var newWidth = 500.0;
+            var newHeight = 700.0;
+            var deltaX = newWidth - oldWidth;
+            var deltaY = newHeight - oldHeight;
+
+            var node = new NodeModel(new Point(100, 100)) { Size = new Size(oldWidth, oldHeight) };
+            var portMock = new Mock<PortModel>(node, PortAlignment.BottomLeft, null, null);
+
+            node.AddPort(portMock.Object);
+
+            // Act
+            node.SetSize(newWidth, newHeight);
+
+            // Assert
+            portMock.Verify(m => m.SetPortPositionOnNodeSizeChanged(deltaX, deltaY), Times.Once);
+        }
+    }
+}
diff --git a/tests/Blazor.Diagrams.Core.Tests/Models/PortModelTest.cs b/tests/Blazor.Diagrams.Core.Tests/Models/PortModelTest.cs
new file mode 100644
index 00000000..d4dc57bf
--- /dev/null
+++ b/tests/Blazor.Diagrams.Core.Tests/Models/PortModelTest.cs
@@ -0,0 +1,33 @@
+using Blazor.Diagrams.Core.Geometry;
+using Blazor.Diagrams.Core.Models;
+using Xunit;
+
+namespace Blazor.Diagrams.Core.Tests.Models
+{
+    public class PortModelTest
+    {
+        [Theory]
+        [InlineData(PortAlignment.Top, 50, 0)]
+        [InlineData(PortAlignment.TopLeft, 0, 0)]
+        [InlineData(PortAlignment.TopRight, 100, 0)]
+        [InlineData(PortAlignment.Bottom, 50, 100)]
+        [InlineData(PortAlignment.BottomLeft, 0, 100)]
+        [InlineData(PortAlignment.BottomRight, 100, 100)]
+        [InlineData(PortAlignment.Left, 0, 50)]
+        [InlineData(PortAlignment.Right, 100, 50)]
+        public void SetPortPositionOnNodeSizeChangedCalculatesCorrectPosition(PortAlignment alignment, double expectedXPosition, double expectedYPosition)
+        {
+            // Arrange
+            var node = new NodeModel();
+            var port = new PortModel(node, alignment, new Point(0, 0));
+            node.Size = new Size(100, 100);
+
+            // Act
+            port.SetPortPositionOnNodeSizeChanged(100, 100);
+
+            // Assert
+            Assert.Equal(expectedXPosition, port.Position.X);
+            Assert.Equal(expectedYPosition, port.Position.Y);
+        }
+    }
+}