diff --git a/requirements-test.txt b/requirements-test.txt
index a4646c19..b39f1ef8 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,6 +1,7 @@
-pytest==8.3.5
+pytest==8.4.0
 pytest-pep8==1.0.6
 pytest-cov==6.1.1
 pytest-aiohttp==1.1.0
+pytest-asyncio==1.0.0
 responses==0.25.7
 pytest_httpserver >= 1.1.2
diff --git a/tests/async_api/test_get_message_content.py b/tests/async_api/test_get_message_content.py
index cdf08b3c..a0a8be57 100644
--- a/tests/async_api/test_get_message_content.py
+++ b/tests/async_api/test_get_message_content.py
@@ -12,6 +12,8 @@
 #  License for the specific language governing permissions and limitations
 #  under the License.
 
+import pytest
+
 from aiohttp import web
 
 from linebot import (
@@ -20,6 +22,7 @@
 from linebot.aiohttp_async_http_client import AiohttpAsyncHttpClient
 
 
+@pytest.mark.asyncio
 async def test_get(aiohttp_client):
     msg = ''.join('Hello, world' for i in range(1000))
 
diff --git a/tests/async_api/test_get_profile.py b/tests/async_api/test_get_profile.py
index 709d7a3b..c2a7fea7 100644
--- a/tests/async_api/test_get_profile.py
+++ b/tests/async_api/test_get_profile.py
@@ -12,6 +12,8 @@
 #  License for the specific language governing permissions and limitations
 #  under the License.
 
+import pytest
+
 from aiohttp import web
 
 from linebot import (
@@ -20,6 +22,7 @@
 from linebot.aiohttp_async_http_client import AiohttpAsyncHttpClient
 
 
+@pytest.mark.asyncio
 async def test_async_profile(aiohttp_client):
     expect = {
         'displayName': 'test',
diff --git a/tests/test_aiohttp_async_http_client.py b/tests/test_aiohttp_async_http_client.py
index 0bc1ca30..e3049ad1 100644
--- a/tests/test_aiohttp_async_http_client.py
+++ b/tests/test_aiohttp_async_http_client.py
@@ -12,11 +12,13 @@
 #  License for the specific language governing permissions and limitations
 #  under the License.
 
+import pytest
 from aiohttp import web
 
 from linebot.aiohttp_async_http_client import AiohttpAsyncHttpClient
 
 
+@pytest.mark.asyncio
 async def test_get(aiohttp_client):
     async def hello(request):
         return web.Response(text='Hello, world')
@@ -31,6 +33,7 @@ async def hello(request):
     assert 'Hello, world' in text
 
 
+@pytest.mark.asyncio
 async def test_get_json(aiohttp_client):
     async def hello(request):
         return web.json_response({'test': 'Hello, world'})
@@ -44,6 +47,7 @@ async def hello(request):
     assert 'Hello, world' == json['test']
 
 
+@pytest.mark.asyncio
 async def test_get_iter(aiohttp_client):
     async def hello(request):
         return web.Response(text='Hello, world')
@@ -61,6 +65,7 @@ async def hello(request):
     assert 'Hello, world' in buffer
 
 
+@pytest.mark.asyncio
 async def test_post(aiohttp_client):
     async def hello(request):
         return web.Response(text='Hello, world')
@@ -75,6 +80,7 @@ async def hello(request):
     assert 'Hello, world' in text
 
 
+@pytest.mark.asyncio
 async def test_delete(aiohttp_client):
     async def hello(request):
         return web.Response(text='Hello, world')
@@ -89,6 +95,7 @@ async def hello(request):
     assert 'Hello, world' in text
 
 
+@pytest.mark.asyncio
 async def test_put(aiohttp_client):
     async def hello(request):
         return web.Response(text='Hello, world')