diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ab10cae..4bc6b0c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Changelog
 
 ## [Unreleased]
+### Fixed
+- Multipart file upload for Async clients, by @HardNorth
+
+## [5.5.0]
 ### Added
 - `RP` class in `reportportal_client.client` module as common interface for all ReportPortal clients, by @HardNorth
 - `reportportal_client.aio` with asynchronous clients and auxiliary classes, by @HardNorth
diff --git a/README.md b/README.md
index 70b5662a..99cba0ce 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![PyPI](https://img.shields.io/pypi/v/reportportal-client.svg?maxAge=259200)](https://pypi.python.org/pypi/reportportal-client)
 [![Python versions](https://img.shields.io/pypi/pyversions/reportportal-client.svg)](https://pypi.org/project/reportportal-client)
 [![Build Status](https://github.com/reportportal/client-Python/actions/workflows/tests.yml/badge.svg)](https://github.com/reportportal/client-Python/actions/workflows/tests.yml)
-[![codecov.io](https://codecov.io/gh/reportportal/client-Python/branch/master/graph/badge.svg)](https://codecov.io/gh/reportportal/client-Python)
+[![codecov.io](https://codecov.io/gh/reportportal/client-Python/branch/develop/graph/badge.svg)](https://codecov.io/gh/reportportal/client-Python)
 [![Join Slack chat!](https://slack.epmrpp.reportportal.io/badge.svg)](https://slack.epmrpp.reportportal.io/)
 [![stackoverflow](https://img.shields.io/badge/reportportal-stackoverflow-orange.svg?style=flat)](http://stackoverflow.com/questions/tagged/reportportal)
 [![Build with Love](https://img.shields.io/badge/build%20with-❤%EF%B8%8F%E2%80%8D-lightgrey.svg)](http://reportportal.io?style=flat)
diff --git a/reportportal_client/aio/client.py b/reportportal_client/aio/client.py
index 2a5dca21..5818ac1b 100644
--- a/reportportal_client/aio/client.py
+++ b/reportportal_client/aio/client.py
@@ -794,7 +794,6 @@ async def finish_launch(self,
         else:
             result = ""
         await self.__client.log_batch(self._log_batcher.flush())
-        await self.close()
         return result
 
     async def update_test_item(
diff --git a/reportportal_client/client.py b/reportportal_client/client.py
index 1b5b73a1..4f6b209b 100644
--- a/reportportal_client/client.py
+++ b/reportportal_client/client.py
@@ -705,7 +705,6 @@ def finish_launch(self,
         else:
             message = ""
         self._log(self._log_batcher.flush())
-        self.close()
         return message
 
     def update_test_item(self, item_uuid: str, attributes: Optional[Union[list, dict]] = None,
diff --git a/reportportal_client/core/rp_requests.py b/reportportal_client/core/rp_requests.py
index 6bd66912..a7482cec 100644
--- a/reportportal_client/core/rp_requests.py
+++ b/reportportal_client/core/rp_requests.py
@@ -578,6 +578,7 @@ async def payload(self) -> aiohttp.MultipartWriter:
         mp_writer = aiohttp.MultipartWriter('form-data')
         mp_writer.append_payload(json_payload)
         for _, file in self._get_files():
-            file_payload = aiohttp.Payload(file[1], content_type=file[2], filename=file[0])
+            file_payload = aiohttp.BytesPayload(file[1], content_type=file[2])
+            file_payload.set_content_disposition('form-data', name='file', filename=file[0])
             mp_writer.append_payload(file_payload)
         return mp_writer
diff --git a/setup.py b/setup.py
index 272b6ac5..5055f950 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 
 from setuptools import setup, find_packages
 
-__version__ = '5.5.0'
+__version__ = '5.5.1'
 
 TYPE_STUBS = ['*.pyi']