diff --git a/pymisp/api.py b/pymisp/api.py
index dce3627..2e88328 100644
--- a/pymisp/api.py
+++ b/pymisp/api.py
@@ -2523,20 +2523,23 @@ class PyMISP:
             to_return.append(a)
         return to_return
 
-    def upload_stix(self, path, version: str = '2'):
+    def upload_stix(self, path = None, data = None, version: str = '2'):
         """Upload a STIX file to MISP.
 
         :param path: Path to the STIX on the disk (can be a path-like object, or a pseudofile)
+        :param data: stix object
         :param version: Can be 1 or 2
         """
-        if isinstance(path, (str, Path)):
-            with open(path, 'rb') as f:
-                to_post = f.read()
+        if path is not None:
+            if isinstance(path, (str, Path)):
+                with open(path, 'rb') as f:
+                    to_post = f.read()
+            else:
+                to_post = path.read()
+        elif data is not None:
+            to_post = data
         else:
-            to_post = path.read()
-
-        if isinstance(to_post, bytes):
-            to_post = to_post.decode()  # type: ignore
+            raise MISPServerError("please fill path or data parameter")
 
         if str(version) == '1':
             url = urljoin(self.root_url, '/events/upload_stix')