diff --git a/internal/serializer/serializer.go b/internal/serializer/serializer.go
index 3ed95a1..1905083 100644
--- a/internal/serializer/serializer.go
+++ b/internal/serializer/serializer.go
@@ -780,9 +780,27 @@ func (s *TableSerializer) serializeCellProperties(cell domain.TableCell) *xml.Ta
 		}
 	}
 
+	// Borders (table cell borders)
+	borders := cell.Borders()
+	if s.hasTableBorders(borders) {
+		props.Borders = &xml.TableBorders{
+			Top:    s.paraSerializer.serializeBorder(borders.Top),
+			Bottom: s.paraSerializer.serializeBorder(borders.Bottom),
+			Left:   s.paraSerializer.serializeBorder(borders.Left),
+			Right:  s.paraSerializer.serializeBorder(borders.Right),
+		}
+	}
+
 	return props
 }
 
+func (s *TableSerializer) hasTableBorders(borders domain.TableBorders) bool {
+	return borders.Top.Style != domain.BorderNone ||
+		borders.Bottom.Style != domain.BorderNone ||
+		borders.Left.Style != domain.BorderNone ||
+		borders.Right.Style != domain.BorderNone
+}
+
 func (s *TableSerializer) widthTypeToString(wType domain.WidthType) string {
 	switch wType {
 	case domain.WidthAuto:
diff --git a/internal/serializer/serializer_test.go b/internal/serializer/serializer_test.go
index b7685ec..9d8e9ae 100644
--- a/internal/serializer/serializer_test.go
+++ b/internal/serializer/serializer_test.go
@@ -185,6 +185,11 @@ func TestTableSerializer(t *testing.T) {
 	// Fill first cell
 	row0, _ := table.Row(0)
 	cell, _ := row0.Cell(0)
+	cell.SetBorders(domain.TableBorders{Top: domain.BorderStyle{
+		Style: domain.BorderSingle,
+		Width: 4,
+		Color: domain.ColorRed,
+	}})
 	cellPara, _ := cell.AddParagraph()
 	cellRun, _ := cellPara.AddRun()
 	cellRun.SetText("Cell 0,0")
@@ -212,6 +217,10 @@ func TestTableSerializer(t *testing.T) {
 	if len(firstCell.Content) == 0 {
 		t.Fatal("expected at least one element in first cell content")
 	}
+
+	if firstCell.Properties.Borders == nil || firstCell.Properties.Borders.Top == nil {
+		t.Errorf("expected border top to be set")
+	}
 	firstPara, ok := firstCell.Content[0].(*xmlstructs.Paragraph)
 	if !ok {
 		t.Fatalf("expected first content element to be paragraph, got %T", firstCell.Content[0])