diff --git a/src/PhpSpreadsheet/Style/Conditional.php b/src/PhpSpreadsheet/Style/Conditional.php
index b008c9f2..2fd415af 100644
--- a/src/PhpSpreadsheet/Style/Conditional.php
+++ b/src/PhpSpreadsheet/Style/Conditional.php
@@ -15,6 +15,7 @@ class Conditional implements IComparable
     const CONDITION_CONTAINSBLANKS = 'containsBlanks';
     const CONDITION_NOTCONTAINSBLANKS = 'notContainsBlanks';
     const CONDITION_DATABAR = 'dataBar';
+    const CONDITION_NOTCONTAINSTEXT = 'notContainsText';
 
     // Operator types
     const OPERATOR_NONE = '';
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
index 3978eb6f..4c2aeb39 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
@@ -634,15 +634,21 @@ class Worksheet extends WriterPart
 
                     self::writeAttributeif(
                         $objWriter,
-                        ($conditional->getConditionType() == Conditional::CONDITION_CELLIS || $conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT)
-                        && $conditional->getOperatorType() != Conditional::OPERATOR_NONE,
+                        in_array($conditional->getConditionType(), [
+                            Conditional::CONDITION_CELLIS,
+                            Conditional::CONDITION_CONTAINSTEXT,
+                            Conditional::CONDITION_NOTCONTAINSTEXT,
+                        ]) && $conditional->getOperatorType() != Conditional::OPERATOR_NONE,
                         'operator',
                         $conditional->getOperatorType()
                     );
 
                     self::writeAttributeIf($objWriter, $conditional->getStopIfTrue(), 'stopIfTrue', '1');
 
-                    if ($conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT) {
+                    if (in_array($conditional->getConditionType(), [
+                        Conditional::CONDITION_CONTAINSTEXT,
+                        Conditional::CONDITION_NOTCONTAINSTEXT,
+                    ])) {
                         self::writeTextCondElements($objWriter, $conditional, $cellCoordinate);
                     } else {
                         self::writeOtherCondElements($objWriter, $conditional, $cellCoordinate);
diff --git a/tests/PhpSpreadsheetTests/Writer/Xlsx/ConditionalTest.php b/tests/PhpSpreadsheetTests/Writer/Xlsx/ConditionalTest.php
new file mode 100644
index 00000000..1bcad0d1
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Xlsx/ConditionalTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Settings;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Style\Conditional;
+use PhpOffice\PhpSpreadsheet\Style\Fill;
+use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class ConditionalTest extends AbstractFunctional
+{
+    /**
+     * @var int
+     */
+    private $prevValue;
+
+    protected function setUp(): void
+    {
+        $this->prevValue = Settings::getLibXmlLoaderOptions();
+
+        // Disable validating XML with the DTD
+        Settings::setLibXmlLoaderOptions($this->prevValue & ~LIBXML_DTDVALID & ~LIBXML_DTDATTR & ~LIBXML_DTDLOAD);
+    }
+
+    protected function tearDown(): void
+    {
+        Settings::setLibXmlLoaderOptions($this->prevValue);
+    }
+
+    /**
+     * Test check if conditional style with type 'notContainsText' works on xlsx
+     */
+    public function testConditionalNotContainsText(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+
+        $condition = new Conditional();
+        $condition->setConditionType(Conditional::CONDITION_NOTCONTAINSTEXT);
+        $condition->setOperatorType(Conditional::OPERATOR_NOTCONTAINS);
+        $condition->setText("C");
+        $condition->getStyle()->applyFromArray([
+            'fill' => [
+                'color' => ['argb' => 'FFFFC000'],
+                'fillType' => Fill::FILL_SOLID,
+            ],
+        ]);
+        $worksheet->setConditionalStyles('A1:A5', [$condition]);
+
+        $writer = new Xlsx($spreadsheet);
+        $writerWorksheet = new Xlsx\Worksheet($writer);
+        $data = $writerWorksheet->writeWorksheet($worksheet, []);
+        $needle = <<<xml
+<conditionalFormatting sqref="A1:A5"><cfRule type="notContainsText" dxfId="" priority="1" operator="notContains" text="C"><formula>ISERROR(SEARCH(&quot;C&quot;,A1:A5))</formula></cfRule></conditionalFormatting>
+xml;
+        $this->assertStringContainsString($needle, $data);
+    }
+}