diff --git a/src/GridFS/WritableStream.php b/src/GridFS/WritableStream.php
index 80bdb4702..fa5e170c7 100644
--- a/src/GridFS/WritableStream.php
+++ b/src/GridFS/WritableStream.php
@@ -26,9 +26,7 @@
 
 use function array_intersect_key;
 use function is_integer;
-use function is_string;
 use function MongoDB\is_document;
-use function MongoDB\is_string_array;
 use function sprintf;
 use function strlen;
 use function substr;
@@ -63,16 +61,9 @@ class WritableStream
      *
      *  * _id (mixed): File document identifier. Defaults to a new ObjectId.
      *
-     *  * aliases (array of strings): DEPRECATED An array of aliases.
-     *    Applications wishing to store aliases should add an aliases field to
-     *    the metadata document instead.
-     *
      *  * chunkSizeBytes (integer): The chunk size in bytes. Defaults to
      *    261120 (i.e. 255 KiB).
      *
-     *  * contentType (string): DEPRECATED content type to be stored with the
-     *    file. This information should now be added to the metadata.
-     *
      *  * metadata (document): User data for the "metadata" field of the files
      *    collection document.
      *
@@ -88,10 +79,6 @@ public function __construct(private CollectionWrapper $collectionWrapper, string
             'chunkSizeBytes' => self::DEFAULT_CHUNK_SIZE_BYTES,
         ];
 
-        if (isset($options['aliases']) && ! is_string_array($options['aliases'])) {
-            throw InvalidArgumentException::invalidType('"aliases" option', $options['aliases'], 'array of strings');
-        }
-
         if (! is_integer($options['chunkSizeBytes'])) {
             throw InvalidArgumentException::invalidType('"chunkSizeBytes" option', $options['chunkSizeBytes'], 'integer');
         }
@@ -100,10 +87,6 @@ public function __construct(private CollectionWrapper $collectionWrapper, string
             throw new InvalidArgumentException(sprintf('Expected "chunkSizeBytes" option to be >= 1, %d given', $options['chunkSizeBytes']));
         }
 
-        if (isset($options['contentType']) && ! is_string($options['contentType'])) {
-            throw InvalidArgumentException::invalidType('"contentType" option', $options['contentType'], 'string');
-        }
-
         if (isset($options['metadata']) && ! is_document($options['metadata'])) {
             throw InvalidArgumentException::expectedDocumentType('"metadata" option', $options['metadata']);
         }
@@ -115,7 +98,7 @@ public function __construct(private CollectionWrapper $collectionWrapper, string
             'filename' => $filename,
             'length' => null,
             'uploadDate' => null,
-        ] + array_intersect_key($options, ['aliases' => 1, 'contentType' => 1, 'metadata' => 1]);
+        ] + array_intersect_key($options, ['metadata' => 1]);
     }
 
     /**
diff --git a/tests/UnifiedSpecTests/Util.php b/tests/UnifiedSpecTests/Util.php
index 0f01558b9..d817d61d3 100644
--- a/tests/UnifiedSpecTests/Util.php
+++ b/tests/UnifiedSpecTests/Util.php
@@ -134,8 +134,8 @@ final class Util
             'delete' => ['id'],
             'downloadByName' => ['filename', 'revision'],
             'download' => ['id'],
-            'uploadWithId' => ['id', 'filename', 'source', 'chunkSizeBytes', 'contentType', 'metadata'],
-            'upload' => ['filename', 'source', 'chunkSizeBytes', 'contentType', 'metadata'],
+            'uploadWithId' => ['id', 'filename', 'source', 'chunkSizeBytes', 'metadata'],
+            'upload' => ['filename', 'source', 'chunkSizeBytes', 'metadata'],
         ],
     ];