diff --git a/vertica_python/vertica/cursor.py b/vertica_python/vertica/cursor.py
index f67a5644..8827d4bd 100644
--- a/vertica_python/vertica/cursor.py
+++ b/vertica_python/vertica/cursor.py
@@ -464,7 +464,7 @@ def iterate(self) -> Generator[Union[List[Any], OrderedDict[str, Any]], None, No
             yield row
             row = self.fetchone()
 
-    def copy(self, sql: str, data: IO[AnyStr], **kwargs: Any) -> None:
+    def copy(self, sql: str, data: Union[IO[AnyStr], bytes, str], **kwargs: Any) -> None:
         """
         Execute a "COPY FROM STDIN" SQL.