diff --git a/CHANGES.rst b/CHANGES.rst
index 6d5c7e24..6b8ce685 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,5 +1,9 @@
 Changes
 -------
+2.5.2 (2023-07-06)
+^^^^^^^^^^^^^^^^^^
+* fix issue #1020
+
 2.5.1 (2023-06-27)
 ^^^^^^^^^^^^^^^^^^
 * bump botocore to 1.29.161
diff --git a/aiobotocore/__init__.py b/aiobotocore/__init__.py
index b8c54948..3bfa1a62 100644
--- a/aiobotocore/__init__.py
+++ b/aiobotocore/__init__.py
@@ -1 +1 @@
-__version__ = '2.5.1'
+__version__ = '2.5.2'
diff --git a/aiobotocore/config.py b/aiobotocore/config.py
index 0da0e8e7..8d7cc6e1 100644
--- a/aiobotocore/config.py
+++ b/aiobotocore/config.py
@@ -15,7 +15,7 @@ def __init__(self, connector_args=None, **kwargs):
 
         if 'keepalive_timeout' not in self.connector_args:
             # AWS has a 20 second idle timeout:
-            # https://forums.aws.amazon.com/message.jspa?messageID=215367
+            #   https://web.archive.org/web/20150926192339/https://forums.aws.amazon.com/message.jspa?messageID=215367
             # and aiohttp default timeout is 30s so we set it to something
             # reasonable here
             self.connector_args['keepalive_timeout'] = 12
diff --git a/aiobotocore/credentials.py b/aiobotocore/credentials.py
index 440e2d4a..5e535ac8 100644
--- a/aiobotocore/credentials.py
+++ b/aiobotocore/credentials.py
@@ -52,6 +52,7 @@
 )
 from dateutil.tz import tzutc
 
+from aiobotocore._helpers import resolve_awaitable
 from aiobotocore.config import AioConfig
 from aiobotocore.tokens import AioSSOTokenProvider
 from aiobotocore.utils import (
@@ -324,7 +325,8 @@ async def _refresh(self):
 
     async def _protected_refresh(self, is_mandatory):
         try:
-            metadata = await self._refresh_using()
+            # AioEnvProvider._create_credentials_fetcher is not and does not need async
+            metadata = await resolve_awaitable(self._refresh_using())
         except Exception:
             period_name = 'mandatory' if is_mandatory else 'advisory'
             logger.warning(
@@ -436,6 +438,7 @@ async def _create_client(self):
         )
 
 
+# black: # fmt: skip (ing) this line triggers internal black error
 class AioAssumeRoleWithWebIdentityCredentialFetcher(
     AioBaseAssumeRoleCredentialFetcher
 ):
diff --git a/aiobotocore/httpsession.py b/aiobotocore/httpsession.py
index 5ae222f4..b98c59ed 100644
--- a/aiobotocore/httpsession.py
+++ b/aiobotocore/httpsession.py
@@ -80,7 +80,7 @@ def __init__(
         self._connector_args = connector_args
         if self._connector_args is None:
             # AWS has a 20 second idle timeout:
-            #   https://forums.aws.amazon.com/message.jspa?messageID=215367
+            #   https://web.archive.org/web/20150926192339/https://forums.aws.amazon.com/message.jspa?messageID=215367
             # aiohttp default timeout is 30s so set something reasonable here
             self._connector_args = dict(keepalive_timeout=12)