diff --git a/install-deps.sh b/install-deps.sh
index 0cea15c..8ebf4b2 100755
--- a/install-deps.sh
+++ b/install-deps.sh
@@ -1,8 +1,9 @@
 #!/bin/sh
 echo "The shell is $SHELL"
 set -e
-pip install --use-mirrors --editable .
-pip install --use-mirrors -r requirements.txt
+PIP_INSTALL="pip install --use-mirrors --upgrade"
+$PIP_INSTALL --editable .
+$PIP_INSTALL -r requirements.txt
 [ -n "$DAV_SERVER" ] || DAV_SERVER=radicale_filesystem
 
 davserver_radicale_filesystem() {
@@ -11,7 +12,7 @@ davserver_radicale_filesystem() {
 
 davserver_radicale_database() {
     radicale_deps
-    pip install --use-mirrors sqlalchemy pysqlite
+    $PIP_INSTALL sqlalchemy pysqlite
 }
 
 radicale_deps() {
@@ -22,7 +23,7 @@ radicale_deps() {
     else
         false
     fi
-    pip install --use-mirrors werkzeug $radicale_pkg
+    $PIP_INSTALL werkzeug $radicale_pkg
 }
 
 davserver_owncloud() {
diff --git a/tests/storage/dav/__init__.py b/tests/storage/dav/__init__.py
index a7bbd43..b3e8c45 100644
--- a/tests/storage/dav/__init__.py
+++ b/tests/storage/dav/__init__.py
@@ -9,6 +9,7 @@
 '''
 
 import os
+import pytest
 
 from .. import StorageTests
 import vdirsyncer.exceptions as exceptions
@@ -24,6 +25,18 @@ elif dav_server == 'owncloud':
 else:
     raise RuntimeError('{} is not a known DAV server.'.format(dav_server))
 
+try:
+    import radicale
+    radicale_version = radicale.VERSION
+    del radicale
+except ImportError:
+    radicale_version = None
+
+
+pytestmark = pytest.mark.xfail(
+    dav_server == 'radicale_database' and radicale_version == '0.8',
+    reason='Database storage of Radicale 0.8 is broken.')
+
 
 class DavStorageTests(ServerMixin, StorageTests):
     def test_dav_broken_item(self):
diff --git a/tests/storage/dav/conftest.py b/tests/storage/dav/conftest.py
index 3dead48..c269c5d 100644
--- a/tests/storage/dav/conftest.py
+++ b/tests/storage/dav/conftest.py
@@ -11,7 +11,9 @@ import os
 import pytest
 
 dav_server = os.environ.get('DAV_SERVER', '').strip() or 'radicale_filesystem'
-php_sh = os.path.abspath(os.path.join(os.path.dirname(__file__), '../../../owncloud-testserver/php.sh'))
+php_sh = os.path.abspath(os.path.join(
+    os.path.dirname(__file__), '../../../owncloud-testserver/php.sh'
+))
 
 if dav_server == 'owncloud':
     @pytest.fixture(autouse=True)
diff --git a/tests/storage/dav/test_caldav.py b/tests/storage/dav/test_caldav.py
index 757981e..225ecde 100644
--- a/tests/storage/dav/test_caldav.py
+++ b/tests/storage/dav/test_caldav.py
@@ -12,7 +12,7 @@
 import requests.exceptions
 from vdirsyncer.storage.dav.caldav import CaldavStorage
 import vdirsyncer.exceptions as exceptions
-from . import DavStorageTests
+from . import DavStorageTests, pytestmark
 
 
 TASK_TEMPLATE = u'''BEGIN:VCALENDAR
diff --git a/tests/storage/dav/test_carddav.py b/tests/storage/dav/test_carddav.py
index 7c8ae34..85bf63d 100644
--- a/tests/storage/dav/test_carddav.py
+++ b/tests/storage/dav/test_carddav.py
@@ -9,7 +9,7 @@
 '''
 
 from vdirsyncer.storage.dav.carddav import CarddavStorage
-from . import DavStorageTests
+from . import DavStorageTests, pytestmark
 
 
 VCARD_TEMPLATE = u'''BEGIN:VCARD