diff --git a/src/Traits/HasPnsEndpoint.php b/src/Traits/HasPnsEndpoint.php
index 8dadbeb..9099cdf 100644
--- a/src/Traits/HasPnsEndpoint.php
+++ b/src/Traits/HasPnsEndpoint.php
@@ -65,7 +65,7 @@ public function getPnsPhoto(array $paths = [], array $query = []): Response
         return $this->get($urlParsed, $query);
     }
 
-    public function downloadPnsPhoto(array $paths = [], array $query = [], string $disk = 'local', string $filename = null): string
+    public function downloadPnsPhoto(array $paths = [], array $query = [], string $disk = 'local', ?string $filename = null): string
     {
         $idPns = $paths['idPns'];
         $filename = $filename ?? "siasn-simpeg/pns/photo/{$idPns}.jpg";
diff --git a/src/Traits/HasUploadEndpoint.php b/src/Traits/HasUploadEndpoint.php
index 9bec9bd..92476c6 100644
--- a/src/Traits/HasUploadEndpoint.php
+++ b/src/Traits/HasUploadEndpoint.php
@@ -16,7 +16,7 @@ public function getDownloadDok(array $paths = [], array $query = []): Response
         return $this->get($urlParsed, $query);
     }
 
-    public function downloadDownloadDok(array $paths = [], array $query = [], string $disk = 'local', string $filename = null): string
+    public function downloadDownloadDok(array $paths = [], array $query = [], string $disk = 'local', ?string $filename = null): string
     {
         $filePath = $query['filePath'];
         $filename = $filename ?? "siasn-simpeg/{$filePath}";