diff --git a/packages/aws-sdk-signers/src/aws_sdk_signers/_io.py b/packages/aws-sdk-signers/src/aws_sdk_signers/_io.py
index ba50f3c4d..9a88ea756 100644
--- a/packages/aws-sdk-signers/src/aws_sdk_signers/_io.py
+++ b/packages/aws-sdk-signers/src/aws_sdk_signers/_io.py
@@ -1,8 +1,8 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-from asyncio import iscoroutinefunction
 from collections.abc import AsyncIterable, AsyncIterator, Awaitable, Callable
+from inspect import iscoroutinefunction
 from io import BytesIO
 from typing import (
     Self,
diff --git a/packages/aws-sdk-signers/src/aws_sdk_signers/signers.py b/packages/aws-sdk-signers/src/aws_sdk_signers/signers.py
index 29ba02894..f74179be5 100644
--- a/packages/aws-sdk-signers/src/aws_sdk_signers/signers.py
+++ b/packages/aws-sdk-signers/src/aws_sdk_signers/signers.py
@@ -6,11 +6,11 @@
 import hmac
 import io
 import warnings
-from asyncio import iscoroutinefunction
 from binascii import hexlify
 from collections.abc import AsyncIterable, Iterable
 from copy import deepcopy
 from hashlib import sha256
+from inspect import iscoroutinefunction
 from typing import TYPE_CHECKING, Required, TypedDict, TypeGuard
 from urllib.parse import parse_qsl, quote
 
diff --git a/packages/smithy-core/src/smithy_core/aio/types.py b/packages/smithy-core/src/smithy_core/aio/types.py
index d175e7e25..3b84317cd 100644
--- a/packages/smithy-core/src/smithy_core/aio/types.py
+++ b/packages/smithy-core/src/smithy_core/aio/types.py
@@ -1,9 +1,9 @@
 #  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #  SPDX-License-Identifier: Apache-2.0
 import asyncio
-from asyncio import iscoroutinefunction
 from collections import deque
 from collections.abc import AsyncIterable, AsyncIterator, Awaitable, Callable
+from inspect import iscoroutinefunction
 from io import BytesIO
 from typing import Any, Self, cast
 
diff --git a/packages/smithy-core/src/smithy_core/interfaces/__init__.py b/packages/smithy-core/src/smithy_core/interfaces/__init__.py
index 39be88d23..558c4c15e 100644
--- a/packages/smithy-core/src/smithy_core/interfaces/__init__.py
+++ b/packages/smithy-core/src/smithy_core/interfaces/__init__.py
@@ -1,7 +1,7 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
-from asyncio import iscoroutinefunction
 from collections.abc import ItemsView, Iterator, KeysView, ValuesView
+from inspect import iscoroutinefunction
 from typing import TYPE_CHECKING, Any, Protocol, TypeGuard, overload, runtime_checkable
 
 if TYPE_CHECKING:
diff --git a/packages/smithy-http/src/smithy_http/serializers.py b/packages/smithy-http/src/smithy_http/serializers.py
index acac7ac75..11a5f18ea 100644
--- a/packages/smithy-http/src/smithy_http/serializers.py
+++ b/packages/smithy-http/src/smithy_http/serializers.py
@@ -1,11 +1,11 @@
 # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
-from asyncio import iscoroutinefunction
 from base64 import b64encode
 from collections.abc import Callable, Iterator, Sized
 from contextlib import contextmanager
 from datetime import datetime
 from decimal import Decimal
+from inspect import iscoroutinefunction
 from io import BytesIO
 from typing import TYPE_CHECKING
 from urllib.parse import quote as urlquote
diff --git a/packages/smithy-http/tests/unit/test_serializers.py b/packages/smithy-http/tests/unit/test_serializers.py
index 83e291b21..7f52da070 100644
--- a/packages/smithy-http/tests/unit/test_serializers.py
+++ b/packages/smithy-http/tests/unit/test_serializers.py
@@ -1,10 +1,10 @@
 #  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 #  SPDX-License-Identifier: Apache-2.0
 import datetime
-from asyncio import iscoroutinefunction
 from dataclasses import dataclass, field
 from datetime import UTC
 from decimal import Decimal
+from inspect import iscoroutinefunction
 from io import BytesIO
 from typing import Any, ClassVar, Protocol, Self