diff --git a/src/pretix/base/middleware.py b/src/pretix/base/middleware.py
index 5188d27006..3769f71602 100644
--- a/src/pretix/base/middleware.py
+++ b/src/pretix/base/middleware.py
@@ -6,6 +6,7 @@ from django.core.urlresolvers import get_script_prefix
 from django.http import HttpRequest, HttpResponse
 from django.utils import timezone, translation
 from django.utils.cache import patch_vary_headers
+from django.utils.deprecation import MiddlewareMixin
 from django.utils.translation import LANGUAGE_SESSION_KEY
 from django.utils.translation.trans_real import (
     check_for_language, get_supported_language_variant, language_code_re,
@@ -15,7 +16,7 @@ from django.utils.translation.trans_real import (
 _supported = None
 
 
-class LocaleMiddleware:
+class LocaleMiddleware(MiddlewareMixin):
 
     """
     This middleware sets the correct locale and timezone
@@ -134,7 +135,7 @@ def get_language_from_request(request: HttpRequest) -> str:
     )
 
 
-class SecurityMiddleware:
+class SecurityMiddleware(MiddlewareMixin):
 
     def _parse_csp(self, header):
         h = {}
diff --git a/src/pretix/control/middleware.py b/src/pretix/control/middleware.py
index d9f53a7478..041f584b17 100644
--- a/src/pretix/control/middleware.py
+++ b/src/pretix/control/middleware.py
@@ -5,13 +5,14 @@ from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.core.urlresolvers import get_script_prefix, resolve
 from django.http import Http404
 from django.shortcuts import redirect, resolve_url
+from django.utils.deprecation import MiddlewareMixin
 from django.utils.encoding import force_str
 from django.utils.translation import ugettext as _
 
 from pretix.base.models import Event, EventPermission, Organizer
 
 
-class PermissionMiddleware:
+class PermissionMiddleware(MiddlewareMixin):
     """
     This middleware enforces all requests to the control app to require login.
     Additionally, it enforces all requests to "control:event." URLs
diff --git a/src/pretix/helpers/debug.py b/src/pretix/helpers/debug.py
new file mode 100644
index 0000000000..cf2dc22cc4
--- /dev/null
+++ b/src/pretix/helpers/debug.py
@@ -0,0 +1,6 @@
+from debug_toolbar.middleware import DebugToolbarMiddleware
+from django.utils.deprecation import MiddlewareMixin
+
+
+class DebugMiddlewareCompatibilityShim(MiddlewareMixin, DebugToolbarMiddleware):
+    pass
diff --git a/src/pretix/multidomain/middlewares.py b/src/pretix/multidomain/middlewares.py
index 65728aa821..154fba225c 100644
--- a/src/pretix/multidomain/middlewares.py
+++ b/src/pretix/multidomain/middlewares.py
@@ -9,6 +9,7 @@ from django.core.urlresolvers import set_urlconf
 from django.http.request import split_domain_port
 from django.middleware.csrf import CsrfViewMiddleware as BaseCsrfMiddleware
 from django.utils.cache import patch_vary_headers
+from django.utils.deprecation import MiddlewareMixin
 from django.utils.http import cookie_date
 
 from pretix.multidomain.models import KnownDomain
@@ -16,7 +17,7 @@ from pretix.multidomain.models import KnownDomain
 LOCAL_HOST_NAMES = ('testserver', 'localhost')
 
 
-class MultiDomainMiddleware:
+class MultiDomainMiddleware(MiddlewareMixin):
     def process_request(self, request):
         # We try three options, in order of decreasing preference.
         if settings.USE_X_FORWARDED_HOST and ('HTTP_X_FORWARDED_HOST' in request.META):
diff --git a/src/pretix/presale/middleware.py b/src/pretix/presale/middleware.py
index 5c454e9f9e..757d85c8e6 100644
--- a/src/pretix/presale/middleware.py
+++ b/src/pretix/presale/middleware.py
@@ -1,11 +1,12 @@
 from django.core.urlresolvers import resolve
+from django.utils.deprecation import MiddlewareMixin
 
 from pretix.presale.signals import process_response
 
 from .utils import _detect_event
 
 
-class EventMiddleware:
+class EventMiddleware(MiddlewareMixin):
     def process_request(self, request):
         url = resolve(request.path_info)
         request._namespace = url.namespace
diff --git a/src/pretix/settings.py b/src/pretix/settings.py
index b561ccff43..245edc8cca 100644
--- a/src/pretix/settings.py
+++ b/src/pretix/settings.py
@@ -193,7 +193,7 @@ CORE_MODULES = {
     ("pretix", "control")
 }
 
-MIDDLEWARE_CLASSES = [
+MIDDLEWARE = [
     'pretix.multidomain.middlewares.MultiDomainMiddleware',
     'pretix.multidomain.middlewares.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
@@ -212,7 +212,7 @@ try:
     import debug_toolbar  # noqa
     if DEBUG:
         INSTALLED_APPS.append('debug_toolbar.apps.DebugToolbarConfig')
-        MIDDLEWARE_CLASSES.append('debug_toolbar.middleware.DebugToolbarMiddleware')
+        MIDDLEWARE.append('pretix.helpers.debug.DebugMiddlewareCompatibilityShim')
 except ImportError:
     pass
 
diff --git a/src/requirements/dev.txt b/src/requirements/dev.txt
index bc512b7562..82b9bf5449 100644
--- a/src/requirements/dev.txt
+++ b/src/requirements/dev.txt
@@ -1,4 +1,4 @@
-django-debug-toolbar==1.4
+django-debug-toolbar==1.5
 sqlparse==0.1.19  # not yet supported by django-debug-toolbar 1.4
 # Testing requirements
 pep8==1.5.7  # exact requirement by flake8 2.4.0
diff --git a/src/requirements/production.txt b/src/requirements/production.txt
index 1fcba40090..d61b93a0d1 100644
--- a/src/requirements/production.txt
+++ b/src/requirements/production.txt
@@ -4,7 +4,7 @@ python-dateutil
 pytz
 django-bootstrap3>=6.2,<6.3
 git+https://github.com/pretix/django-formset-js.git@master#egg=django-formset-js
-django-compressor==2.0
+django-compressor==2.1
 reportlab>=3.2,<3.3
 git+https://github.com/pretix/PyPDF2.git@pretix#egg=PyPDF2
 easy-thumbnails>=2.2,<3