diff --git a/requirements.txt b/requirements.txt
index ee4ba4f..94a5b5f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 aiohttp
+aiofiles
diff --git a/setup.py b/setup.py
index 7085d01..967c8bd 100644
--- a/setup.py
+++ b/setup.py
@@ -20,8 +20,7 @@
       author_email="ivknv0@gmail.com",
       license="LGPLv3",
       python_requires=">=3.8",
-      install_requires=["aiohttp"],
-      tests_require=["aiofiles"],
+      install_requires=["aiohttp", "aiofiles"],
       url="https://github.com/ivknv/yadisk-async",
       project_urls={"Source code": "https://github.com/ivknv/yadisk-async",
                     "Documentation (EN)": "https://yadisk-async.readthedocs.io/en/latest",
diff --git a/yadisk_async/yadisk.py b/yadisk_async/yadisk.py
index 6b526a8..e175a6d 100644
--- a/yadisk_async/yadisk.py
+++ b/yadisk_async/yadisk.py
@@ -12,14 +12,17 @@
 from . import settings
 from .session import SessionWithHeaders
 from .api import *
-from .exceptions import InvalidResponseError, UnauthorizedError, OperationNotFoundError
-from .exceptions import PathNotFoundError, WrongResourceTypeError
+from .exceptions import (
+    InvalidResponseError, UnauthorizedError, OperationNotFoundError,
+    PathNotFoundError, WrongResourceTypeError)
 from .utils import get_exception, auto_retry
 from .objects import ResourceLinkObject, PublicResourceLinkObject
 
 from typing import Any, Optional, Union, IO, TYPE_CHECKING
 from .compat import Callable, AsyncGenerator, List, Awaitable, Dict
 
+import aiofiles
+
 if TYPE_CHECKING:
     from .objects import (
         TokenObject, TokenRevokeStatusObject, DiskInfoObject,
@@ -683,7 +686,7 @@ async def _upload(self,
         try:
             if isinstance(file_or_path, (str, bytes)):
                 close_file = True
-                file = open(file_or_path, "rb")
+                file = await aiofiles.open(file_or_path, "rb")
             elif inspect.isasyncgenfunction(file_or_path):
                 generator_factory = file_or_path
             else:
@@ -737,7 +740,7 @@ async def attempt():
             await auto_retry(attempt, n_retries, retry_interval)
         finally:
             if close_file and file is not None:
-                file.close()
+                await file.close()
 
     async def upload(self,
                      path_or_file: FileOrPath,
@@ -849,7 +852,7 @@ async def _download(self,
         try:
             if isinstance(file_or_path, (str, bytes)):
                 close_file = True
-                file = open(file_or_path, "wb")
+                file = await aiofiles.open(file_or_path, "wb")
             else:
                 close_file = False
                 file = file_or_path
@@ -893,7 +896,7 @@ async def attempt() -> None:
             return await auto_retry(attempt, n_retries, retry_interval)
         finally:
             if close_file and file is not None:
-                file.close()
+                await file.close()
 
     async def download(self,
                        src_path: str,