diff --git a/src/ref/ext/spout/ref_builder_xlsx.php b/src/ref/ext/spout/ref_builder_xlsx.php
index a47311c..fe85dff 100644
--- a/src/ref/ext/spout/ref_builder_xlsx.php
+++ b/src/ref/ext/spout/ref_builder_xlsx.php
@@ -14,6 +14,7 @@ class ref_builder_xlsx extends ref_builder {
      "page_size" => "string",
      "fit_to_height" => "bool",
      "fit_to_width" => "bool",
+     "page_order" => "string",
    ],
    "->setPageMargin" => [
      PageMargin::class,
diff --git a/upstream-4.x/src/Writer/XLSX/Helper/FileSystemHelper.php b/upstream-4.x/src/Writer/XLSX/Helper/FileSystemHelper.php
index c9803d1..5539b6a 100644
--- a/upstream-4.x/src/Writer/XLSX/Helper/FileSystemHelper.php
+++ b/upstream-4.x/src/Writer/XLSX/Helper/FileSystemHelper.php
@@ -517,6 +517,10 @@ final class FileSystemHelper implements FileSystemWithRootFolderHelperInterface
             $xml .= " paperSize=\"{$pageSetup->paperSize->value}\"";
         }
 
+        if (null !== $pageSetup->pageOrder) {
+            $xml .= " pageOrder=\"{$pageSetup->pageOrder->value}\"";
+        }
+
         if (null !== $pageSetup->fitToHeight) {
             $xml .= " fitToHeight=\"{$pageSetup->fitToHeight}\"";
         }
diff --git a/upstream-4.x/src/Writer/XLSX/Options/PageOrder.php b/upstream-4.x/src/Writer/XLSX/Options/PageOrder.php
new file mode 100644
index 0000000..ceb716b
--- /dev/null
+++ b/upstream-4.x/src/Writer/XLSX/Options/PageOrder.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenSpout\Writer\XLSX\Options;
+
+enum PageOrder: string
+{
+    case DOWN_THEN_OVER = 'downThenOver';
+    case OVER_THEN_DOWN = 'overThenDown';
+}
diff --git a/upstream-4.x/src/Writer/XLSX/Options/PageSetup.php b/upstream-4.x/src/Writer/XLSX/Options/PageSetup.php
index 860312c..42fec69 100644
--- a/upstream-4.x/src/Writer/XLSX/Options/PageSetup.php
+++ b/upstream-4.x/src/Writer/XLSX/Options/PageSetup.php
@@ -13,6 +13,7 @@ final readonly class PageSetup
         public ?PaperSize $paperSize,
         public ?int $fitToHeight = null,
         public ?int $fitToWidth = null,
+        public ?PageOrder $pageOrder = null,
     ) {
         $this->fitToPage = null !== $fitToHeight || null !== $fitToWidth;
     }