diff --git a/motor/aiohttp/__init__.py b/motor/aiohttp/__init__.py
index 16220e76..eb3dc86f 100644
--- a/motor/aiohttp/__init__.py
+++ b/motor/aiohttp/__init__.py
@@ -248,7 +248,7 @@ def _set_standard_headers(self, path, resp, gridout, checksum):
 
         if cache_time > 0:
             resp.headers["Expires"] = (
-                datetime.datetime.now(datetime.timezone.utc)
+                datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
                 + datetime.timedelta(seconds=cache_time)
             ).strftime("%a, %d %b %Y %H:%M:%S GMT")
 
diff --git a/motor/web.py b/motor/web.py
index aa6fc2d5..4cce6d71 100644
--- a/motor/web.py
+++ b/motor/web.py
@@ -126,7 +126,7 @@ async def get(self, path, include_body=True):
         if cache_time > 0:
             self.set_header(
                 "Expires",
-                datetime.datetime.now(datetime.timezone.utc)
+                datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
                 + datetime.timedelta(seconds=cache_time),
             )
             self.set_header("Cache-Control", "max-age=" + str(cache_time))
diff --git a/pyproject.toml b/pyproject.toml
index a79acece..c34a6126 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -112,6 +112,8 @@ filterwarnings = [
     "ignore: The fetch_next property is deprecated:DeprecationWarning",
     "ignore:The next_object method is deprecated:DeprecationWarning",
     "ignore:unclosed <ssl.SSLSocket:ResourceWarning",
+    "ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning",
+    "ignore:datetime.datetime.utcnow:DeprecationWarning",
 ]
 
 [tool.ruff]
diff --git a/test/asyncio_tests/test_aiohttp_gridfs.py b/test/asyncio_tests/test_aiohttp_gridfs.py
index 967c25c2..50e8a5ba 100644
--- a/test/asyncio_tests/test_aiohttp_gridfs.py
+++ b/test/asyncio_tests/test_aiohttp_gridfs.py
@@ -62,14 +62,14 @@ def setUpClass(cls):
         cls.contents = b"Jesse" * 100 * 1024
 
         # Record when we created the file, to check the Last-Modified header
-        cls.put_start = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0)
+        cls.put_start = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0, tzinfo=None)
         file_id = "id"
         cls.file_id = file_id
         cls.fs.delete(cls.file_id)
         cls.fs.put(cls.contents, _id=file_id, filename="foo", content_type="my type")
         item = cls.fs.get(file_id)
         cls.contents_hash = _hash_gridout(item)
-        cls.put_end = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0)
+        cls.put_end = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0, tzinfo=None)
         cls.app = cls.srv = cls.app_handler = None
 
     @classmethod
@@ -232,7 +232,7 @@ class AIOHTTPTZAwareGridFSHandlerTest(AIOHTTPGridFSHandlerTestBase):
     async def test_tz_aware(self):
         client = self.asyncio_client(tz_aware=True)
         await self.start_app(AIOHTTPGridFS(client.motor_test))
-        now = datetime.datetime.now(datetime.timezone.utc)
+        now = datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
         ago = now - datetime.timedelta(minutes=10)
         hence = now + datetime.timedelta(minutes=10)
 
@@ -276,7 +276,7 @@ def extras(response, gridout):
         self.assertRegex(cache_control, r"max-age=\d+")
         self.assertEqual(10, int(cache_control.split("=")[1]))
         expiration = parse_date(response.headers["Expires"])
-        now = datetime.datetime.now(datetime.timezone.utc)
+        now = datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
 
         # It should expire about 10 seconds from now
         self.assertTrue(
diff --git a/test/tornado_tests/test_motor_web.py b/test/tornado_tests/test_motor_web.py
index 0be12eea..cd172858 100644
--- a/test/tornado_tests/test_motor_web.py
+++ b/test/tornado_tests/test_motor_web.py
@@ -43,7 +43,7 @@ def setUp(self):
         self.contents = b"Jesse" * 100 * 1024
 
         # Record when we created the file, to check the Last-Modified header
-        self.put_start = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0)
+        self.put_start = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0, tzinfo=None)
         file_id = "id"
         self.file_id = file_id
         self.fs.delete(self.file_id)
@@ -51,7 +51,7 @@ def setUp(self):
 
         item = self.fs.get(file_id)
         self.contents_hash = _hash_gridout(item)
-        self.put_end = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0)
+        self.put_end = datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0, tzinfo=None)
         self.assertTrue(self.fs.get_last_version("foo"))
 
     def motor_db(self, **kwargs):
@@ -174,7 +174,7 @@ def motor_db(self):
         return super().motor_db(tz_aware=True)
 
     def test_tz_aware(self):
-        now = datetime.datetime.now(datetime.timezone.utc)
+        now = datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
         ago = now - datetime.timedelta(minutes=10)
         hence = now + datetime.timedelta(minutes=10)
 
@@ -219,7 +219,7 @@ def test_get_gridfs_file(self):
         # It should expire about 10 seconds from now
         self.assertTrue(
             datetime.timedelta(seconds=8)
-            < expires - datetime.datetime.now(datetime.timezone.utc)
+            < expires - datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
             < datetime.timedelta(seconds=12)
         )