diff --git a/src/zcl_excel_worksheet.clas.abap b/src/zcl_excel_worksheet.clas.abap
index 542ad56..5916fb5 100644
--- a/src/zcl_excel_worksheet.clas.abap
+++ b/src/zcl_excel_worksheet.clas.abap
@@ -5127,21 +5127,31 @@ CLASS ZCL_EXCEL_WORKSHEET IMPLEMENTATION.
   method UPDATE_DIMENSION_RANGE.
 
     data: LS_SHEET_CONTENT type ZEXCEL_S_CELL_DATA,
-          LT_SHEET_CONTENT type ZEXCEL_T_CELL_DATA_UNSORTED,
           LV_ROW_ALPHA     type STRING,
           LV_COLUMN_ALPHA  type ZEXCEL_CELL_COLUMN_ALPHA.
 
     check SHEET_CONTENT is not initial.
 
-* update dimension range
-    LT_SHEET_CONTENT = SHEET_CONTENT.
-    "upper left corner
-    sort LT_SHEET_CONTENT by CELL_ROW.
-    read table LT_SHEET_CONTENT index 1 into LS_SHEET_CONTENT.
-    UPPER_CELL-CELL_ROW = LS_SHEET_CONTENT-CELL_ROW.
-    sort LT_SHEET_CONTENT by CELL_COLUMN.
-    read table LT_SHEET_CONTENT index 1 into LS_SHEET_CONTENT.
-    UPPER_CELL-CELL_COLUMN = LS_SHEET_CONTENT-CELL_COLUMN.
+    UPPER_CELL-CELL_ROW = ZCL_EXCEL_COMMON=>C_EXCEL_SHEET_MAX_ROW.
+    UPPER_CELL-CELL_COLUMN = ZCL_EXCEL_COMMON=>C_EXCEL_SHEET_MAX_COL.
+
+    LOWER_CELL-CELL_ROW = ZCL_EXCEL_COMMON=>C_EXCEL_SHEET_MIN_ROW.
+    LOWER_CELL-CELL_COLUMN = ZCL_EXCEL_COMMON=>C_EXCEL_SHEET_MIN_COL.
+
+    loop at SHEET_CONTENT into LS_SHEET_CONTENT.
+      if UPPER_CELL-CELL_ROW > LS_SHEET_CONTENT-CELL_ROW.
+        UPPER_CELL-CELL_ROW = LS_SHEET_CONTENT-CELL_ROW.
+      endif.
+      if UPPER_CELL-CELL_COLUMN > LS_SHEET_CONTENT-CELL_COLUMN.
+        UPPER_CELL-CELL_COLUMN = LS_SHEET_CONTENT-CELL_COLUMN.
+      endif.
+      if LOWER_CELL-CELL_ROW < LS_SHEET_CONTENT-CELL_ROW.
+        LOWER_CELL-CELL_ROW = LS_SHEET_CONTENT-CELL_ROW.
+      endif.
+      if LOWER_CELL-CELL_COLUMN < LS_SHEET_CONTENT-CELL_COLUMN.
+        LOWER_CELL-CELL_COLUMN = LS_SHEET_CONTENT-CELL_COLUMN.
+      endif.
+    endloop.
 
     LV_ROW_ALPHA = UPPER_CELL-CELL_ROW.
     LV_COLUMN_ALPHA = ZCL_EXCEL_COMMON=>CONVERT_COLUMN2ALPHA( UPPER_CELL-CELL_COLUMN ).
@@ -5149,14 +5159,6 @@ CLASS ZCL_EXCEL_WORKSHEET IMPLEMENTATION.
     shift LV_ROW_ALPHA left deleting leading SPACE.
     concatenate LV_COLUMN_ALPHA LV_ROW_ALPHA into UPPER_CELL-CELL_COORDS.
 
-    "bottom right corner
-    sort LT_SHEET_CONTENT by CELL_ROW descending.
-    read table LT_SHEET_CONTENT index 1 into LS_SHEET_CONTENT.
-    LOWER_CELL-CELL_ROW = LS_SHEET_CONTENT-CELL_ROW.
-    sort LT_SHEET_CONTENT by CELL_COLUMN descending.
-    read table LT_SHEET_CONTENT index 1 into LS_SHEET_CONTENT.
-    LOWER_CELL-CELL_COLUMN = LS_SHEET_CONTENT-CELL_COLUMN.
-
     LV_ROW_ALPHA = LOWER_CELL-CELL_ROW.
     LV_COLUMN_ALPHA = ZCL_EXCEL_COMMON=>CONVERT_COLUMN2ALPHA( LOWER_CELL-CELL_COLUMN ).
     shift LV_ROW_ALPHA right deleting trailing SPACE.