diff --git a/mamweb/settings_common.py b/mamweb/settings_common.py
index 71bae132..d6ed2852 100644
--- a/mamweb/settings_common.py
+++ b/mamweb/settings_common.py
@@ -28,7 +28,6 @@ APPEND_SLASH = True
 LANGUAGE_CODE = 'cs'
 TIME_ZONE = 'Europe/Prague'
 USE_I18N = True
-USE_L10N = True
 USE_TZ = True
 
 # Static files (CSS, JavaScript, Images)
diff --git a/seminar/migrations/0006_problem_add_timestamp.py b/seminar/migrations/0006_problem_add_timestamp.py
index 3df8bfdb..fd1509de 100644
--- a/seminar/migrations/0006_problem_add_timestamp.py
+++ b/seminar/migrations/0006_problem_add_timestamp.py
@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 
 from django.db import models, migrations
 import datetime
-from django.utils.timezone import utc
 
 
 class Migration(migrations.Migration):
@@ -16,7 +15,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='problem',
             name='timestamp',
-            field=models.DateTimeField(default=datetime.datetime(2015, 5, 15, 8, 54, 56, 319985, tzinfo=utc), verbose_name='vytvo\u0159eno', auto_now=True),
+            field=models.DateTimeField(default=datetime.datetime(2015, 5, 15, 8, 54, 56, 319985, tzinfo=datetime.timezone.utc), verbose_name='vytvo\u0159eno', auto_now=True),
             preserve_default=False,
         ),
         migrations.AlterField(