diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 274764b1f..78979ae92 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -6800,11 +6800,6 @@ parameters:
 			count: 3
 			path: tests/PhpSpreadsheetTests/Writer/Html/HtmlCommentsTest.php
 
-		-
-			message: "#^Parameter \\#1 \\$directory of function chdir expects string, string\\|false given\\.$#"
-			count: 1
-			path: tests/PhpSpreadsheetTests/Writer/Html/ImagesRootTest.php
-
 		-
 			message: "#^Parameter \\#1 \\$options of static method PhpOffice\\\\PhpSpreadsheet\\\\Settings\\:\\:setLibXmlLoaderOptions\\(\\) expects int, null given\\.$#"
 			count: 1
diff --git a/tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/SubTotalTest.php b/tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/SubTotalTest.php
index 2a54e4591..cf79ac0b1 100644
--- a/tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/SubTotalTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/Functions/MathTrig/SubTotalTest.php
@@ -92,7 +92,7 @@ class SubTotalTest extends AllSetupTeardown
             '12' => false,
         ];
         foreach ($visibleRows as $row => $visible) {
-            $rowDimension = $sheet->getRowDimension($row);
+            $rowDimension = $sheet->getRowDimension((int) $row);
             $rowDimension->setVisible($visible);
         }
         $sheet->getCell('D2')->setValue("=SUBTOTAL($type, A1:$maxCol$maxRow)");
diff --git a/tests/PhpSpreadsheetTests/Writer/Html/ImagesRootTest.php b/tests/PhpSpreadsheetTests/Writer/Html/ImagesRootTest.php
index 40099177f..b36a87c0b 100644
--- a/tests/PhpSpreadsheetTests/Writer/Html/ImagesRootTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Html/ImagesRootTest.php
@@ -10,13 +10,18 @@ use PhpOffice\PhpSpreadsheetTests\Functional;
 class ImagesRootTest extends Functional\AbstractFunctional
 {
     /**
-     * @var false|string
+     * @var string
      */
-    private $curdir;
+    private $curdir = '';
 
     protected function setUp(): void
     {
-        $this->curdir = getcwd();
+        $curdir = getcwd();
+        if ($curdir === false) {
+            self::fail('Unable to obtain current directory');
+        } else {
+            $this->curdir = $curdir;
+        }
     }
 
     protected function tearDown(): void
@@ -64,5 +69,6 @@ class ImagesRootTest extends Functional\AbstractFunctional
         self::assertCount(1, $img);
         self::assertEquals("$root/$stub", $img[0]->getAttribute('src'));
         self::assertEquals($desc, $img[0]->getAttribute('alt'));
+        $spreadsheet->disconnectWorksheets();
     }
 }