diff --git a/composer.json b/composer.json
index 29eba03..85b6f3f 100644
--- a/composer.json
+++ b/composer.json
@@ -23,9 +23,9 @@
         "docs": "http://docs.portphp.org"
     },
     "require": {
-        "php": ">=5.6.0",
+        "php": ">=8.1",
         "portphp/portphp": "^1.3",
-        "phpoffice/phpspreadsheet": "^1.3"
+        "phpoffice/phpspreadsheet": "^1.3 || ^2.0 || ^3.0 || ^4.0 || ^5.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/SpreadsheetReader.php b/src/SpreadsheetReader.php
index 1a42b96..1074102 100644
--- a/src/SpreadsheetReader.php
+++ b/src/SpreadsheetReader.php
@@ -65,17 +65,15 @@ class SpreadsheetReader implements CountableReader, \SeekableIterator
      */
     protected $worksheet;
 
-    // phpcs:disable Generic.Files.LineLength.MaxExceeded
     /**
      * @param \SplFileObject $file            Spreadsheet file
-     * @param int            $headerRowNumber Optional number of header row
-     * @param int            $activeSheet     Index of active sheet to read from
+     * @param int|null       $headerRowNumber Optional number of header row
+     * @param int|null       $activeSheet     Index of active sheet to read from
      * @param bool           $readOnly        If set to false, the reader take care of the spreadsheet formatting (slow)
-     * @param int            $maxRows         Maximum number of rows to read
+     * @param int|null       $maxRows         Maximum number of rows to read
      */
-    public function __construct(\SplFileObject $file, $headerRowNumber = null, $activeSheet = null, $readOnly = true, $maxRows = null)
+    public function __construct(\SplFileObject $file, ?int $headerRowNumber = null, ?int $activeSheet = null, bool $readOnly = true, ?int $maxRows = null)
     {
-        // phpcs:enable Generic.Files.LineLength.MaxExceeded
         $reader = IOFactory::createReaderForFile($file->getPathName());
         $reader->setReadDataOnly($readOnly);
         /** @var Spreadsheet $spreadsheet */
@@ -103,7 +101,7 @@ public function __construct(\SplFileObject $file, $headerRowNumber = null, $acti
     /**
      * @return int
      */
-    public function count()
+    public function count(): int
     {
         $count = count($this->worksheet);
         if (null !== $this->headerRowNumber) {
@@ -122,7 +120,7 @@ public function count()
      *
      * @author  Derek Chafin <infomaniac50@gmail.com>
      */
-    public function current()
+    public function current(): mixed
     {
         $row = $this->worksheet[$this->pointer];
 
@@ -141,7 +139,7 @@ public function current()
      *
      * @return array
      */
-    public function getColumnHeaders()
+    public function getColumnHeaders(): array
     {
         return $this->columnHeaders;
     }
@@ -151,9 +149,9 @@ public function getColumnHeaders()
      *
      * @param int $number
      *
-     * @return array
+     * @return array|null
      */
-    public function getRow($number)
+    public function getRow(int $number): mixed
     {
         $this->seek($number);
 
@@ -165,17 +163,15 @@ public function getRow($number)
      *
      * @return int
      */
-    public function key()
+    public function key(): mixed
     {
         return $this->pointer;
     }
 
     /**
      * Move forward to next element
-     *
-     * @return void Any returned value is ignored.
      */
-    public function next()
+    public function next(): void
     {
         $this->pointer++;
     }
@@ -186,10 +182,8 @@ public function next()
      * If a header row has been set, the pointer is set just below the header
      * row. That way, when you iterate over the rows, that header row is
      * skipped.
-     *
-     * @return void Any returned value is ignored.
      */
-    public function rewind()
+    public function rewind(): void
     {
         if (null === $this->headerRowNumber) {
             $this->pointer = 0;
@@ -204,10 +198,8 @@ public function rewind()
      * @link http://php.net/manual/en/seekableiterator.seek.php
      *
      * @param int $pointer The position to seek to.
-     *
-     * @return void Any returned value is ignored.
      */
-    public function seek($pointer)
+    public function seek(int $pointer): void
     {
         $this->pointer = $pointer;
     }
@@ -216,10 +208,8 @@ public function seek($pointer)
      * Set column headers
      *
      * @param array $columnHeaders
-     *
-     * @return void Any returned value is ignored.
      */
-    public function setColumnHeaders(array $columnHeaders)
+    public function setColumnHeaders(array $columnHeaders): void
     {
         $this->columnHeaders = $columnHeaders;
     }
@@ -228,10 +218,8 @@ public function setColumnHeaders(array $columnHeaders)
      * Set header row number
      *
      * @param int $rowNumber Number of the row that contains column header names
-     *
-     * @return void Any returned value is ignored.
      */
-    public function setHeaderRowNumber($rowNumber)
+    public function setHeaderRowNumber(int $rowNumber): void
     {
         $this->headerRowNumber = $rowNumber;
         $this->columnHeaders   = $this->worksheet[$rowNumber];
@@ -240,10 +228,9 @@ public function setHeaderRowNumber($rowNumber)
     /**
      * Checks if current position is valid
      *
-     * @return bool The return value will be casted to boolean and then evaluated.
-     * Returns true on success or false on failure.
+     * @return bool
      */
-    public function valid()
+    public function valid(): bool
     {
         return isset($this->worksheet[$this->pointer]);
     }
diff --git a/src/SpreadsheetReaderFactory.php b/src/SpreadsheetReaderFactory.php
index 086aa97..4e7f8cd 100644
--- a/src/SpreadsheetReaderFactory.php
+++ b/src/SpreadsheetReaderFactory.php
@@ -24,6 +24,7 @@
  */
 namespace Port\Spreadsheet;
 
+use Port\Reader;
 use Port\Reader\ReaderFactory;
 
 /**
@@ -34,20 +35,20 @@
 class SpreadsheetReaderFactory implements ReaderFactory
 {
     /**
-     * @var int
+     * @var int|null
      */
     protected $activeSheet;
 
     /**
-     * @var int
+     * @var int|null
      */
     protected $headerRowNumber;
 
     /**
-     * @param int $headerRowNumber
-     * @param int $activeSheet
+     * @param int|null $headerRowNumber
+     * @param int|null $activeSheet
      */
-    public function __construct($headerRowNumber = null, $activeSheet = null)
+    public function __construct(?int $headerRowNumber = null, ?int $activeSheet = null)
     {
         $this->headerRowNumber = $headerRowNumber;
         $this->activeSheet     = $activeSheet;
@@ -58,7 +59,7 @@ public function __construct($headerRowNumber = null, $activeSheet = null)
      *
      * @return SpreadsheetReader
      */
-    public function getReader(\SplFileObject $file)
+    public function getReader(\SplFileObject $file): Reader
     {
         return new SpreadsheetReader($file, $this->headerRowNumber, $this->activeSheet);
     }
diff --git a/src/SpreadsheetWriter.php b/src/SpreadsheetWriter.php
index 05d471e..ab3b35d 100644
--- a/src/SpreadsheetWriter.php
+++ b/src/SpreadsheetWriter.php
@@ -24,6 +24,7 @@
  */
 namespace Port\Spreadsheet;
 
+use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use Port\Writer;
@@ -67,11 +68,11 @@ class SpreadsheetWriter implements Writer
 
     /**
      * @param \SplFileObject $file             File
-     * @param string         $sheet            Sheet title (optional)
+     * @param string|null    $sheet            Sheet title (optional)
      * @param string         $type             Spreadsheet file type (defaults to Xlsx)
      * @param bool           $prependHeaderRow
      */
-    public function __construct(\SplFileObject $file, $sheet = null, $type = 'Xlsx', $prependHeaderRow = false)
+    public function __construct(\SplFileObject $file, ?string $sheet = null, string $type = 'Xlsx', bool $prependHeaderRow = false)
     {
         $this->filename         = $file->getPathname();
         $this->sheet            = $sheet;
@@ -81,10 +82,8 @@ public function __construct(\SplFileObject $file, $sheet = null, $type = 'Xlsx',
 
     /**
      * Wrap up the writer after all items have been written
-     *
-     * @return void Any returned value is ignored.
      */
-    public function finish()
+    public function finish(): void
     {
         $writer = IOFactory::createWriter($this->spreadsheet, $this->type);
         $writer->save($this->filename);
@@ -92,10 +91,8 @@ public function finish()
 
     /**
      * Prepare the writer before writing the items
-     *
-     * @return void Any returned value is ignored.
      */
-    public function prepare()
+    public function prepare(): void
     {
         $reader = IOFactory::createReader($this->type);
         if ($reader->canRead($this->filename)) {
@@ -116,10 +113,8 @@ public function prepare()
      * Write one data item
      *
      * @param array $item The data item with converted values
-     *
-     * @return void Any returned value is ignored.
      */
-    public function writeItem(array $item)
+    public function writeItem(array $item): void
     {
         $count = count($item);
 
@@ -127,7 +122,8 @@ public function writeItem(array $item)
             $headers = array_keys($item);
 
             for ($i = 0; $i < $count; $i++) {
-                $this->spreadsheet->getActiveSheet()->setCellValueByColumnAndRow($i + 1, $this->row, $headers[$i]);
+                $col = Coordinate::stringFromColumnIndex($i + 1);
+                $this->spreadsheet->getActiveSheet()->setCellValue($col . $this->row, $headers[$i]);
             }
             $this->row++;
         }
@@ -135,7 +131,8 @@ public function writeItem(array $item)
         $values = array_values($item);
 
         for ($i = 0; $i < $count; $i++) {
-            $this->spreadsheet->getActiveSheet()->setCellValueByColumnAndRow($i + 1, $this->row, $values[$i]);
+            $col = Coordinate::stringFromColumnIndex($i + 1);
+            $this->spreadsheet->getActiveSheet()->setCellValue($col . $this->row, $values[$i]);
         }
 
         $this->row++;