diff --git a/lib/Qrcode/Decoder/Decoder.php b/lib/Qrcode/Decoder/Decoder.php
index c88279e..c6b0f89 100644
--- a/lib/Qrcode/Decoder/Decoder.php
+++ b/lib/Qrcode/Decoder/Decoder.php
@@ -147,7 +147,7 @@ public function decodeBits(\Zxing\Common\BitMatrix $bits, $hints = null): string
 		}
 	}
 
-	private function decodeParser(\Zxing\Qrcode\Decoder\BitMatrixParser $parser, array $hints = null): DecoderResult
+	private function decodeParser(\Zxing\Qrcode\Decoder\BitMatrixParser $parser, ?array $hints = null): DecoderResult
 	{
 		$version = $parser->readVersion();
 		$ecLevel = $parser->readFormatInformation()->getErrorCorrectionLevel();
diff --git a/lib/Qrcode/Detector/Detector.php b/lib/Qrcode/Detector/Detector.php
index f3dac17..9bd4734 100644
--- a/lib/Qrcode/Detector/Detector.php
+++ b/lib/Qrcode/Detector/Detector.php
@@ -52,7 +52,7 @@ public function __construct(private BitMatrix $image)
 	 * @throws NotFoundException if QR Code cannot be found
 	 * @throws FormatException if a QR Code cannot be decoded
 	 */
-	final public function detect(array $hints = null): DetectorResult
+	final public function detect(?array $hints = null): DetectorResult
 	{/*Map<DecodeHintType,?>*/
 
 		$resultPointCallback = ($hints !== null && array_key_exists('NEED_RESULT_POINT_CALLBACK', $hints)) ?