diff --git a/src/pretix/presale/views/__init__.py b/src/pretix/presale/views/__init__.py
index ce29cbfdd5..2ec162cc36 100644
--- a/src/pretix/presale/views/__init__.py
+++ b/src/pretix/presale/views/__init__.py
@@ -33,7 +33,7 @@
 # License for the specific language governing permissions and limitations under the License.
 import copy
 from collections import defaultdict
-from datetime import datetime, timedelta
+from datetime import UTC, datetime, timedelta
 from decimal import Decimal
 from functools import wraps
 from itertools import groupby
@@ -493,7 +493,7 @@ def iframe_entry_view_wrapper(view_func):
                 settings.LANGUAGE_COOKIE_NAME,
                 locale,
                 max_age=max_age,
-                expires=(datetime.utcnow() + timedelta(seconds=max_age)).strftime('%a, %d-%b-%Y %H:%M:%S GMT'),
+                expires=(datetime.now(UTC) + timedelta(seconds=max_age)).strftime('%a, %d-%b-%Y %H:%M:%S GMT'),
             )
             return resp
 
diff --git a/src/pretix/presale/views/locale.py b/src/pretix/presale/views/locale.py
index 9cc0df2d77..95b80ac710 100644
--- a/src/pretix/presale/views/locale.py
+++ b/src/pretix/presale/views/locale.py
@@ -32,7 +32,7 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under the License.
 
-from datetime import datetime, timedelta
+from datetime import UTC, datetime, timedelta
 
 from django.conf import settings
 from django.http import HttpResponseRedirect
@@ -60,7 +60,7 @@ class LocaleSet(NoSearchIndexViewMixin, View):
                 settings.LANGUAGE_COOKIE_NAME,
                 locale,
                 max_age=max_age,
-                expires=(datetime.utcnow() + timedelta(seconds=max_age)).strftime(
+                expires=(datetime.now(UTC) + timedelta(seconds=max_age)).strftime(
                     '%a, %d-%b-%Y %H:%M:%S GMT'),
             )
 
diff --git a/src/setup.cfg b/src/setup.cfg
index d8fe454317..df7e47fec2 100644
--- a/src/setup.cfg
+++ b/src/setup.cfg
@@ -33,6 +33,7 @@ filterwarnings =
     ignore::DeprecationWarning:cgi
     ignore::DeprecationWarning:vat_moss
     ignore:.*ast.NameConstant.*:DeprecationWarning:reportlab
+    ignore:.*utcnow.*:DeprecationWarning:openpyxl
     ignore:.*PyType_Spec.*:DeprecationWarning:
     ignore:.*truth value.*:DeprecationWarning:sepaxml
     ignore::pytz_deprecation_shim._exceptions.PytzUsageWarning:vobject