diff --git a/tests/test_dispatcher/test_dispatcher.py b/tests/test_dispatcher/test_dispatcher.py
index f501ed75..43684bb4 100644
--- a/tests/test_dispatcher/test_dispatcher.py
+++ b/tests/test_dispatcher/test_dispatcher.py
@@ -1,5 +1,6 @@
 import asyncio
 import datetime
+import sys
 import time
 import warnings
 from collections import Counter
@@ -702,7 +703,10 @@ class TestDispatcher:
         dispatcher = Dispatcher()
         dispatcher.message.register(simple_message_handler)
 
-        response = await dispatcher.feed_webhook_update(bot, RAW_UPDATE, _timeout=0.3)
+        # Running this test on PyPy with coverage pytest plugin makes the test run slower
+        # than expected, so we adjust the timeout accordingly.
+        timeout = 0.5 if sys.implementation.name == "pypy" else 0.3
+        response = await dispatcher.feed_webhook_update(bot, RAW_UPDATE, _timeout=timeout)
         assert isinstance(response, dict)
         assert response["method"] == "sendMessage"
         assert response["text"] == "ok"
diff --git a/tests/test_webhook/test_aiohtt_server.py b/tests/test_webhook/test_aiohtt_server.py
index ceb24243..f7aa0f4b 100644
--- a/tests/test_webhook/test_aiohtt_server.py
+++ b/tests/test_webhook/test_aiohtt_server.py
@@ -1,4 +1,5 @@
 import asyncio
+import sys
 import time
 from asyncio import Event
 from dataclasses import dataclass
@@ -115,7 +116,10 @@ class TestSimpleRequestHandler:
             handler_event.clear()
             resp = await self.make_reqest(client=client)
             assert resp.status == 200
-            await asyncio.wait_for(handler_event.wait(), timeout=1)
+            # Running this test on PyPy with coverage pytest plugin makes the test run slower
+            # than expected, so we adjust the timeout accordingly.
+            timeout = 1.5 if sys.implementation.name == "pypy" else 1
+            await asyncio.wait_for(handler_event.wait(), timeout=timeout)
             mocked_silent_call_request.assert_awaited()
         result = await resp.json()
         assert not result