diff --git a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
index 741d0aa..84278ec 100644
--- a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
@@ -271,6 +271,17 @@ EOD;
         }
 
         \fwrite($worksheetFilePointer, '</sheetData>');
+        // do sth to merging cells
+                $mergeRanges = $worksheet->getExternalSheet()->getMergeRanges();
+        if(!empty($mergeRanges)) {
+            $startLine = '<mergeCells count="1">';
+            $rangeLine = '';
+            foreach ($mergeRanges as $key => $range) {
+                $rangeLine .= '<mergeCell ref="' . $range . '"/>';
+            }
+            $endLine = '</mergeCells>';
+            \fwrite($worksheetFilePointer, $startLine.$rangeLine.$endLine);
+        }
         \fwrite($worksheetFilePointer, '</worksheet>');
         \fclose($worksheetFilePointer);
     }