diff --git a/mdrsclient/api/files.py b/mdrsclient/api/files.py
index 4e75e9e..e047a9d 100644
--- a/mdrsclient/api/files.py
+++ b/mdrsclient/api/files.py
@@ -1,6 +1,7 @@
 import mimetypes
 import os
 from typing import Any, Final
+from unicodedata import normalize
 
 from pydantic import TypeAdapter
 from pydantic.dataclasses import dataclass
@@ -53,7 +54,7 @@ class FilesApi(BaseApi):
         try:
             with open(os.path.realpath(path), mode="rb") as fp:
                 data = MultipartEncoder(
-                    fields={"folder_id": folder_id, "file": (os.path.basename(path), fp, self._get_mime_type(path))}
+                    fields={"folder_id": folder_id, "file": (normalize("NFC", os.path.basename(path)), fp, self._get_mime_type(path))}
                 )
                 response = self.connection.post(url, data=data, headers={"Content-Type": data.content_type})
                 self._raise_response_error(response)
@@ -75,7 +76,7 @@ class FilesApi(BaseApi):
             # update file body
             try:
                 with open(os.path.realpath(path), mode="rb") as fp:
-                    data = MultipartEncoder(fields={"file": (os.path.basename(path), fp, self._get_mime_type(path))})
+                    data = MultipartEncoder(fields={"file": (normalize("NFC", os.path.basename(path)), fp, self._get_mime_type(path))})
                     response = self.connection.put(url, data=data, headers={"Content-Type": data.content_type})
             except OSError:
                 raise UnexpectedException(f"Could not open `{path}` file.")
diff --git a/mdrsclient/commands/upload.py b/mdrsclient/commands/upload.py
index 379ba65..6f82ebd 100644
--- a/mdrsclient/commands/upload.py
+++ b/mdrsclient/commands/upload.py
@@ -2,6 +2,7 @@ import os
 from argparse import Namespace
 from concurrent.futures import ThreadPoolExecutor
 from typing import Any
+from unicodedata import normalize
 
 from pydantic.dataclasses import dataclass
 
@@ -81,7 +82,7 @@ class UploadCommand(BaseCommand):
                 if folder_map.get(d_dirname) is None:
                     d_folder = folder_map[d_parent_dirname].find_sub_folder(d_basename)
                     if d_folder is None:
-                        d_folder_id = folder_api.create(d_basename, folder_map[d_parent_dirname].id)
+                        d_folder_id = folder_api.create(normalize("NFC", d_basename), folder_map[d_parent_dirname].id)
                     else:
                         d_folder_id = d_folder.id
                     print(d_dirname)