diff --git a/boards/admin.py b/boards/admin.py
--- a/boards/admin.py
+++ b/boards/admin.py
@@ -1,11 +1,11 @@
-from boards.abstracts.sticker_factory import StickerFactory
+from django.contrib import admin
+from django.urls import reverse
+from django.utils.translation import ugettext_lazy as _
+
+from boards.models import Post, Tag, Ban, Thread, Banner, Attachment, \
+    KeyPair, GlobalId, TagAlias, STATUS_ACTIVE
 from boards.models.attachment import FILE_TYPES_IMAGE, AttachmentSticker, \
     StickerPack
-from django.contrib import admin
-from django.utils.translation import ugettext_lazy as _
-from django.core.urlresolvers import reverse
-from boards.models import Post, Tag, Ban, Thread, Banner, Attachment, \
-        KeyPair, GlobalId, TagAlias, STATUS_ACTIVE
 from boards.models.source import ThreadSource
 
 
diff --git a/boards/mdx_neboard.py b/boards/mdx_neboard.py
--- a/boards/mdx_neboard.py
+++ b/boards/mdx_neboard.py
@@ -1,4 +1,5 @@
 # coding=utf-8
+from xml import etree
 
 import re
 import random
@@ -7,7 +8,7 @@ import bbcode
 from urllib.parse import unquote
 
 from django.core.exceptions import ObjectDoesNotExist
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 import boards
 from boards import settings
diff --git a/boards/middlewares.py b/boards/middlewares.py
--- a/boards/middlewares.py
+++ b/boards/middlewares.py
@@ -19,10 +19,11 @@ class BanMiddleware:
     anything
     """
 
-    def __init__(self):
-        pass
+    def __init__(self, get_response):
+        self.get_response = get_response
 
-    def process_view(self, request, view_func, view_args, view_kwargs):
+    def __call__(self, request):
+        response = self.get_response(request)
 
         if request.path != '/banned/':
             ip = utils.get_client_ip(request)
@@ -33,12 +34,21 @@ class BanMiddleware:
                 if not ban.can_read:
                     return redirect('banned')
 
+        return response
+
 
 class TimezoneMiddleware(object):
-    def process_request(self, request):
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+
         tzname = request.session.get(SESSION_TIMEZONE)
         if tzname:
             timezone.activate(pytz.timezone(tzname))
         else:
             timezone.deactivate()
 
+        return response
+
diff --git a/boards/migrations/0001_initial.py b/boards/migrations/0001_initial.py
--- a/boards/migrations/0001_initial.py
+++ b/boards/migrations/0001_initial.py
@@ -106,7 +106,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='post',
             name='thread_new',
-            field=models.ForeignKey(null=True, default=None, to='boards.Thread'),
+            field=models.ForeignKey(on_delete=models.CASCADE, null=True, default=None, to='boards.Thread'),
             preserve_default=True,
         ),
     ]
diff --git a/boards/migrations/0009_post_thread.py b/boards/migrations/0009_post_thread.py
--- a/boards/migrations/0009_post_thread.py
+++ b/boards/migrations/0009_post_thread.py
@@ -21,7 +21,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='post',
             name='thread',
-            field=models.ForeignKey(related_name='pt+', to='boards.Thread', default=None, null=True),
+            field=models.ForeignKey(on_delete=models.CASCADE, related_name='pt+', to='boards.Thread', default=None, null=True),
             preserve_default=False,
         ),
         migrations.RunPython(first_thread_to_thread),
diff --git a/boards/migrations/0010_auto_20150208_1451.py b/boards/migrations/0010_auto_20150208_1451.py
--- a/boards/migrations/0010_auto_20150208_1451.py
+++ b/boards/migrations/0010_auto_20150208_1451.py
@@ -25,7 +25,7 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='post',
             name='thread',
-            field=models.ForeignKey(to='boards.Thread', related_name='pt+'),
+            field=models.ForeignKey(on_delete=models.CASCADE, to='boards.Thread', related_name='pt+'),
             preserve_default=True,
         ),
         migrations.RunPython(clean_duplicate_tags),
diff --git a/boards/migrations/0011_notification.py b/boards/migrations/0011_notification.py
--- a/boards/migrations/0011_notification.py
+++ b/boards/migrations/0011_notification.py
@@ -16,7 +16,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('id', models.AutoField(serialize=False, verbose_name='ID', auto_created=True, primary_key=True)),
                 ('name', models.TextField()),
-                ('post', models.ForeignKey(to='boards.Post')),
+                ('post', models.ForeignKey(on_delete=models.CASCADE, to='boards.Post')),
             ],
             options={
             },
diff --git a/boards/migrations/0014_auto_20150418_1749.py b/boards/migrations/0014_auto_20150418_1749.py
--- a/boards/migrations/0014_auto_20150418_1749.py
+++ b/boards/migrations/0014_auto_20150418_1749.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from django.db import models, migrations
 
diff --git a/boards/migrations/0018_banner.py b/boards/migrations/0018_banner.py
--- a/boards/migrations/0018_banner.py
+++ b/boards/migrations/0018_banner.py
@@ -17,7 +17,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(serialize=False, primary_key=True, verbose_name='ID', auto_created=True)),
                 ('title', models.TextField()),
                 ('text', models.TextField()),
-                ('post', models.ForeignKey(to='boards.Post')),
+                ('post', models.ForeignKey(on_delete=models.CASCADE, to='boards.Post')),
             ],
         ),
     ]
diff --git a/boards/migrations/0026_auto_20150830_2006.py b/boards/migrations/0026_auto_20150830_2006.py
--- a/boards/migrations/0026_auto_20150830_2006.py
+++ b/boards/migrations/0026_auto_20150830_2006.py
@@ -37,12 +37,12 @@ class Migration(migrations.Migration):
                 ('key_type', models.TextField()),
                 ('key', models.TextField()),
                 ('signature', models.TextField()),
-                ('global_id', models.ForeignKey(to='boards.GlobalId')),
+                ('global_id', models.ForeignKey(on_delete=models.CASCADE, to='boards.GlobalId')),
             ],
         ),
         migrations.AddField(
             model_name='post',
             name='global_id',
-            field=models.OneToOneField(to='boards.GlobalId', null=True, blank=True),
+            field=models.OneToOneField(on_delete=models.CASCADE, to='boards.GlobalId', null=True, blank=True),
         ),
     ]
diff --git a/boards/migrations/0029_tag_parent.py b/boards/migrations/0029_tag_parent.py
--- a/boards/migrations/0029_tag_parent.py
+++ b/boards/migrations/0029_tag_parent.py
@@ -14,6 +14,6 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='tag',
             name='parent',
-            field=models.ForeignKey(to='boards.Tag', null=True),
+            field=models.ForeignKey(on_delete=models.CASCADE, to='boards.Tag', null=True),
         ),
     ]
diff --git a/boards/migrations/0030_auto_20150929_1816.py b/boards/migrations/0030_auto_20150929_1816.py
--- a/boards/migrations/0030_auto_20150929_1816.py
+++ b/boards/migrations/0030_auto_20150929_1816.py
@@ -14,6 +14,6 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='tag',
             name='parent',
-            field=models.ForeignKey(related_name='children', null=True, to='boards.Tag'),
+            field=models.ForeignKey(on_delete=models.CASCADE, related_name='children', null=True, to='boards.Tag'),
         ),
     ]
diff --git a/boards/migrations/0033_auto_20151014_2224.py b/boards/migrations/0033_auto_20151014_2224.py
--- a/boards/migrations/0033_auto_20151014_2224.py
+++ b/boards/migrations/0033_auto_20151014_2224.py
@@ -14,6 +14,6 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='tag',
             name='parent',
-            field=models.ForeignKey(blank=True, related_name='children', to='boards.Tag', null=True),
+            field=models.ForeignKey(on_delete=models.CASCADE, blank=True, related_name='children', to='boards.Tag', null=True),
         ),
     ]
diff --git a/boards/models/attachment/__init__.py b/boards/models/attachment/__init__.py
--- a/boards/models/attachment/__init__.py
+++ b/boards/models/attachment/__init__.py
@@ -173,9 +173,9 @@ class StickerPack(models.Model):
 
 
 class AttachmentSticker(models.Model):
-    attachment = models.ForeignKey('Attachment')
+    attachment = models.ForeignKey('Attachment', on_delete=models.CASCADE)
     name = models.TextField(unique=True)
-    stickerpack = models.ForeignKey('StickerPack')
+    stickerpack = models.ForeignKey('StickerPack', on_delete=models.CASCADE)
 
     def __str__(self):
         # Local stickers do not have a sticker pack
diff --git a/boards/models/attachment/viewers.py b/boards/models/attachment/viewers.py
--- a/boards/models/attachment/viewers.py
+++ b/boards/models/attachment/viewers.py
@@ -1,17 +1,10 @@
-import re
-
-from PIL import Image
-
 from django.contrib.staticfiles import finders
 from django.contrib.staticfiles.templatetags.staticfiles import static
 from django.core.files.images import get_image_dimensions
 from django.template.defaultfilters import filesizeformat
-from django.core.urlresolvers import reverse
-from django.utils.translation import ugettext_lazy as _, ungettext_lazy
 
+from boards import settings
 from boards.utils import get_domain, cached_result, get_extension
-from boards import settings
-
 
 FILE_STUB_IMAGE = 'images/file.png'
 FILE_STUB_URL = 'url'
diff --git a/boards/models/banner.py b/boards/models/banner.py
--- a/boards/models/banner.py
+++ b/boards/models/banner.py
@@ -4,7 +4,7 @@ from django.db import models
 class Banner(models.Model):
     title = models.TextField()
     text = models.TextField(blank=True, null=True)
-    post = models.ForeignKey('Post')
+    post = models.ForeignKey('Post', on_delete=models.CASCADE)
 
     def __str__(self):
         return self.title
diff --git a/boards/models/post/__init__.py b/boards/models/post/__init__.py
--- a/boards/models/post/__init__.py
+++ b/boards/models/post/__init__.py
@@ -1,8 +1,13 @@
 import uuid
+
 import hashlib
 import re
+from django.db import models
+from django.db.models import TextField
+from django.template.defaultfilters import truncatewords, striptags
+from django.template.loader import render_to_string
+from django.urls import reverse
 
-from boards import settings
 from boards.abstracts.tripcode import Tripcode
 from boards.models import Attachment, KeyPair, GlobalId
 from boards.models.attachment import FILE_TYPES_IMAGE
@@ -10,12 +15,6 @@ from boards.models.base import Viewable
 from boards.models.post.export import get_exporter, DIFF_TYPE_JSON
 from boards.models.post.manager import PostManager, NO_IP
 from boards.utils import datetime_to_epoch
-from django.core.exceptions import ObjectDoesNotExist
-from django.core.urlresolvers import reverse
-from django.db import models
-from django.db.models import TextField, QuerySet, F
-from django.template.defaultfilters import truncatewords, striptags
-from django.template.loader import render_to_string
 
 CSS_CLS_HIDDEN_POST = 'hidden_post'
 CSS_CLS_DEAD_POST = 'dead_post'
@@ -87,7 +86,8 @@ class Post(models.Model, Viewable):
                                               blank=True, related_name='refposts',
                                               db_index=True)
     refmap = models.TextField(null=True, blank=True)
-    thread = models.ForeignKey('Thread', db_index=True, related_name='replies')
+    thread = models.ForeignKey('Thread', on_delete=models.CASCADE,
+                               db_index=True, related_name='replies')
 
     url = models.TextField()
     uid = models.TextField()
diff --git a/boards/models/signature.py b/boards/models/signature.py
--- a/boards/models/signature.py
+++ b/boards/models/signature.py
@@ -122,4 +122,4 @@ class Signature(models.Model):
     key = models.TextField()
     signature = models.TextField()
 
-    global_id = models.ForeignKey('GlobalId')
+    global_id = models.ForeignKey('GlobalId', on_delete=models.CASCADE)
diff --git a/boards/models/source.py b/boards/models/source.py
--- a/boards/models/source.py
+++ b/boards/models/source.py
@@ -29,7 +29,7 @@ class ThreadSource(models.Model):
         app_label = 'boards'
 
     name = models.TextField()
-    thread = models.ForeignKey('Thread')
+    thread = models.ForeignKey('Thread', on_delete=models.CASCADE)
     timestamp = models.DateTimeField()
     source = models.TextField()
     source_type = models.CharField(max_length=SOURCE_TYPE_MAX_LENGTH,
diff --git a/boards/models/tag.py b/boards/models/tag.py
--- a/boards/models/tag.py
+++ b/boards/models/tag.py
@@ -1,5 +1,5 @@
 import hashlib
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.db.models import Count, Q
 from django.utils.translation import get_language
@@ -37,8 +37,8 @@ class TagAlias(models.Model, Viewable):
     name = models.CharField(max_length=100, db_index=True)
     locale = models.CharField(max_length=10, db_index=True)
 
-    parent = models.ForeignKey('Tag', null=True, blank=True,
-            related_name='aliases')
+    parent = models.ForeignKey('Tag', on_delete=models.CASCADE, null=True,
+                               blank=True, related_name='aliases')
 
 
 class TagManager(models.Manager):
@@ -91,8 +91,8 @@ class Tag(models.Model, Viewable):
     required = models.BooleanField(default=False, db_index=True)
     description = models.TextField(blank=True)
 
-    parent = models.ForeignKey('Tag', null=True, blank=True,
-            related_name='children')
+    parent = models.ForeignKey('Tag', on_delete=models.CASCADE, null=True,
+                               blank=True, related_name='children')
 
     def get_name(self):
         return self.aliases.get(locale=DEFAULT_LOCALE).name
diff --git a/boards/models/user.py b/boards/models/user.py
--- a/boards/models/user.py
+++ b/boards/models/user.py
@@ -40,6 +40,6 @@ class Notification(models.Model):
 
     objects = NotificationManager()
 
-    post = models.ForeignKey('Post')
+    post = models.ForeignKey('Post', on_delete=models.CASCADE)
     name = models.TextField()
 
diff --git a/boards/templatetags/board.py b/boards/templatetags/board.py
--- a/boards/templatetags/board.py
+++ b/boards/templatetags/board.py
@@ -1,13 +1,9 @@
 import re
-
+from django import template
 from django.shortcuts import get_object_or_404
-from django import template
 from django.utils.text import re_tag
-from django.core.urlresolvers import reverse
 
 from boards.mdx_neboard import LINE_BREAK_HTML
-from boards import settings
-
 
 IMG_ACTION_URL = '[<a href="{}">{}</a>]'
 REGEX_NEWLINE = re.compile(LINE_BREAK_HTML)
diff --git a/boards/urls.py b/boards/urls.py
--- a/boards/urls.py
+++ b/boards/urls.py
@@ -1,4 +1,6 @@
 from django.conf.urls import url
+from django.urls import path
+from django.views.i18n import JavaScriptCatalog
 
 from boards import views
 from boards.rss import AllThreadsFeed, TagThreadsFeed, ThreadPostsFeed
@@ -12,12 +14,8 @@ from boards.views.search import BoardSea
 from boards.views.static import StaticPageView
 from boards.views.sync import get_post_sync_data, response_get, response_list
 from boards.views.tag_gallery import TagGalleryView
-from boards.views.translation import cached_javascript_catalog
 from boards.views.utils import UtilsView
 
-js_info_dict = {
-    'packages': ('boards',),
-}
 
 urlpatterns = [
     # /boards/
@@ -61,8 +59,7 @@ urlpatterns = [
     url(r'^thread/(?P<post_id>\d+)/rss/$', ThreadPostsFeed()),
 
     # i18n
-    url(r'^jsi18n/$', cached_javascript_catalog, js_info_dict,
-        name='js_info_dict'),
+    path('jsi18n/', JavaScriptCatalog.as_view(packages=['boards']), name='js_info_dict'),
 
     # API
     url(r'^api/post/(?P<post_id>\d+)/$', api.get_post, name="get_post"),
diff --git a/boards/views/__init__.py b/boards/views/__init__.py
--- a/boards/views/__init__.py
+++ b/boards/views/__init__.py
@@ -1,9 +0,0 @@
-__author__ = 'neko259'
-
-from django.views.decorators.cache import cache_page
-from django.views.i18n import javascript_catalog
-
-
-@cache_page(86400)
-def cached_js_catalog(request, domain='djangojs', packages=None):
-    return javascript_catalog(request, domain, packages)
diff --git a/boards/views/all_threads.py b/boards/views/all_threads.py
--- a/boards/views/all_threads.py
+++ b/boards/views/all_threads.py
@@ -1,24 +1,22 @@
-from django.core.urlresolvers import reverse
-from django.core.files import File
-from django.core.files.temp import NamedTemporaryFile
 from django.core.paginator import EmptyPage
 from django.db import transaction
 from django.http import Http404
 from django.shortcuts import render, redirect
+from django.urls import reverse
 from django.utils.decorators import method_decorator
 from django.views.decorators.csrf import csrf_protect
 
 from boards import utils, settings
 from boards.abstracts.paginator import get_paginator
-from boards.abstracts.settingsmanager import get_settings_manager,\
-        SETTING_ONLY_FAVORITES
+from boards.abstracts.settingsmanager import get_settings_manager, \
+    SETTING_ONLY_FAVORITES
 from boards.forms import ThreadForm, PlainErrorList
 from boards.models import Post, Thread, Ban
 from boards.views.banned import BannedView
 from boards.views.base import BaseBoardView, CONTEXT_FORM
+from boards.views.mixins import FileUploadMixin, PaginatedMixin, \
+    DispatcherMixin, PARAMETER_METHOD
 from boards.views.posting_mixin import PostMixin
-from boards.views.mixins import FileUploadMixin, PaginatedMixin,\
-        DispatcherMixin, PARAMETER_METHOD
 
 FORM_TAGS = 'tags'
 FORM_TEXT = 'text'
diff --git a/boards/views/feed.py b/boards/views/feed.py
--- a/boards/views/feed.py
+++ b/boards/views/feed.py
@@ -1,4 +1,4 @@
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.shortcuts import render
 
 from boards import settings
diff --git a/boards/views/search.py b/boards/views/search.py
--- a/boards/views/search.py
+++ b/boards/views/search.py
@@ -1,7 +1,7 @@
 from django.shortcuts import render
 from django.views.generic import View
 from django.db.models import Q
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from boards.abstracts.paginator import get_paginator
 from boards.forms import SearchForm, PlainErrorList
diff --git a/boards/views/tag_gallery.py b/boards/views/tag_gallery.py
--- a/boards/views/tag_gallery.py
+++ b/boards/views/tag_gallery.py
@@ -1,9 +1,9 @@
-from django.core.urlresolvers import reverse
 from django.shortcuts import get_object_or_404, render
+from django.urls import reverse
 
 from boards import settings
 from boards.abstracts.paginator import get_paginator
-from boards.models import Tag, TagAlias
+from boards.models import TagAlias
 from boards.views.base import BaseBoardView
 from boards.views.mixins import PaginatedMixin
 
diff --git a/boards/views/tag_threads.py b/boards/views/tag_threads.py
--- a/boards/views/tag_threads.py
+++ b/boards/views/tag_threads.py
@@ -1,5 +1,5 @@
 from django.shortcuts import get_object_or_404, redirect
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from boards.abstracts.settingsmanager import get_settings_manager, \
         SETTING_FAVORITE_TAGS, SETTING_HIDDEN_TAGS
diff --git a/boards/views/thread/thread.py b/boards/views/thread/thread.py
--- a/boards/views/thread/thread.py
+++ b/boards/views/thread/thread.py
@@ -1,24 +1,18 @@
-from django.contrib.auth.decorators import permission_required
-
 from django.core.exceptions import ObjectDoesNotExist
-from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.shortcuts import get_object_or_404, render, redirect
-from django.template.context_processors import csrf
+from django.urls import reverse
 from django.utils.decorators import method_decorator
 from django.views.decorators.csrf import csrf_protect
 from django.views.generic.edit import FormMixin
-from django.utils import timezone
-from django.utils.dateformat import format
 
-from boards import utils, settings
+from boards import utils
 from boards.abstracts.settingsmanager import get_settings_manager
 from boards.forms import PostForm, PlainErrorList
 from boards.models import Post
 from boards.views.base import BaseBoardView, CONTEXT_FORM
 from boards.views.mixins import DispatcherMixin, PARAMETER_METHOD
 from boards.views.posting_mixin import PostMixin
-import neboard
 
 REQ_POST_ID = 'post_id'
 
diff --git a/boards/views/translation.py b/boards/views/translation.py
deleted file mode 100644
--- a/boards/views/translation.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from django.views.decorators.cache import cache_page
-from django.views.i18n import javascript_catalog
-
-@cache_page(600)
-def cached_javascript_catalog(request, domain='djangojs', packages=None):
-    return javascript_catalog(request, domain, packages)
-
diff --git a/neboard/settings.py b/neboard/settings.py
--- a/neboard/settings.py
+++ b/neboard/settings.py
@@ -104,7 +104,7 @@ TEMPLATES = [{
 }]
 
 
-MIDDLEWARE_CLASSES = [
+MIDDLEWARE = [
     'django.middleware.http.ConditionalGetMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.locale.LocaleMiddleware',
@@ -179,7 +179,7 @@ POSTING_DELAY = 20  # seconds
 SESSION_ENGINE = 'django.contrib.sessions.backends.cached_db'
 
 # Debug middlewares
-MIDDLEWARE_CLASSES += [
+MIDDLEWARE += [
     'debug_toolbar.middleware.DebugToolbarMiddleware',
 ]
 
diff --git a/neboard/urls.py b/neboard/urls.py
--- a/neboard/urls.py
+++ b/neboard/urls.py
@@ -13,7 +13,7 @@ urlpatterns = [
     # Uncomment the admin/doc line below to enable admin documentation:
     # url(r'^admin/doc/', include('django.contrib.admindocs.urls')),
 
-    url(r'^admin/', include(admin.site.urls), name='admin'),
+    url(r'^admin/', admin.site.urls, name='admin'),
     url(r'^', include('boards.urls')),
 ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)