diff --git a/CHANGES.rst b/CHANGES.rst
index 470a1f5..2ceb4ba 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,6 +8,22 @@ Changelog
 
 .. towncrier release notes start
 
+4.4.0 (2024-04-25)
+------------------
+
+New features:
+
+
+- Import ILanguageSchema from plone.i18n.interfaces instead of Products.CMFPlone.interfaces.controlpanel. @ksuess
+  profile "plone.volto:multilingual": Add language german. @ksuess (#144)
+
+
+Bug fixes:
+
+
+- Avoid a deprecated import warnings in Plone 6. @davisagli (#147)
+
+
 4.3.0 (2024-01-30)
 ------------------
 
diff --git a/news/144.feature b/news/144.feature
deleted file mode 100644
index 0fc478d..0000000
--- a/news/144.feature
+++ /dev/null
@@ -1,2 +0,0 @@
-Import ILanguageSchema from plone.i18n.interfaces instead of Products.CMFPlone.interfaces.controlpanel. @ksuess
-profile "plone.volto:multilingual": Add language german. @ksuess
diff --git a/setup.py b/setup.py
index 82a0d4a..08e5fe2 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@ def readfile(name):
 
 setup(
     name="plone.volto",
-    version="4.3.1.dev0",
+    version="4.4.1.dev0",
     description="Volto integration add-on for Plone",
     long_description=long_description,
     # Get more from https://pypi.org/classifiers/
diff --git a/src/plone/volto/bbb.py b/src/plone/volto/bbb.py
new file mode 100644
index 0000000..906d6de
--- /dev/null
+++ b/src/plone/volto/bbb.py
@@ -0,0 +1,11 @@
+# flake8: noqa
+
+try:
+    from plone.base.interfaces import IPloneSiteRoot
+except ImportError:
+    from Products.CMFPlone.interfaces import IPloneSiteRoot
+
+try:
+    from plone.base.utils import get_installer
+except ImportError:
+    from Products.CMFPlone.utils import get_installer
diff --git a/src/plone/volto/browser/breadcrumbs.py b/src/plone/volto/browser/breadcrumbs.py
index b9c3b75..bdb1574 100644
--- a/src/plone/volto/browser/breadcrumbs.py
+++ b/src/plone/volto/browser/breadcrumbs.py
@@ -6,13 +6,19 @@
 from Products.CMFPlone import utils
 from Products.CMFPlone.browser.interfaces import INavigationBreadcrumbs
 from Products.CMFPlone.browser.navigation import get_view_url
-from Products.CMFPlone.defaultpage import check_default_page_via_view
-from Products.CMFPlone.interfaces import IHideFromBreadcrumbs
 from Products.Five import BrowserView
 from zope.component import getMultiAdapter
 from zope.interface import implementer
 
 
+try:
+    from plone.base.defaultpage import check_default_page_via_view
+    from plone.base.interfaces import IHideFromBreadcrumbs
+except ImportError:
+    from Products.CMFPlone.defaultpage import check_default_page_via_view
+    from Products.CMFPlone.interfaces import IHideFromBreadcrumbs
+
+
 @implementer(INavigationBreadcrumbs)
 class PhysicalNavigationBreadcrumbs(BrowserView):
     def breadcrumbs(self):
diff --git a/src/plone/volto/browser/migrate_to_volto.py b/src/plone/volto/browser/migrate_to_volto.py
index 8eba43b..d5c58b9 100644
--- a/src/plone/volto/browser/migrate_to_volto.py
+++ b/src/plone/volto/browser/migrate_to_volto.py
@@ -8,12 +8,12 @@
 from plone.app.redirector.interfaces import IRedirectionStorage
 from plone.app.textfield.value import RichTextValue
 from plone.dexterity.interfaces import IDexterityFTI
+from plone.volto.bbb import get_installer
 from plone.volto.browser.migrate_richtext import get_blocks_from_richtext
 from plone.volto.browser.migrate_richtext import migrate_richtext_to_blocks
 from Products.BTreeFolder2.BTreeFolder2 import BTreeFolder2Base
 from Products.CMFCore.utils import getToolByName
 from Products.CMFPlone.relationhelper import restore_relations
-from Products.CMFPlone.utils import get_installer
 from Products.Five import BrowserView
 from uuid import uuid4
 from zope.component import getUtility
diff --git a/src/plone/volto/browser/navigation.py b/src/plone/volto/browser/navigation.py
index f2b01d6..5c86929 100644
--- a/src/plone/volto/browser/navigation.py
+++ b/src/plone/volto/browser/navigation.py
@@ -8,13 +8,18 @@
 from Products.CMFPlone.browser.interfaces import INavigationTabs
 from Products.CMFPlone.browser.navigation import get_id
 from Products.CMFPlone.browser.navigation import get_view_url
-from Products.CMFPlone.interfaces import INavigationSchema
 from Products.Five import BrowserView
 from zope.component import getMultiAdapter
 from zope.component import getUtility
 from zope.interface import implementer
 
 
+try:
+    from plone.base.interfaces import INavigationSchema
+except ImportError:
+    from Products.CMFPlone.interfaces import INavigationSchema
+
+
 @implementer(INavigationTabs)
 class CatalogNavigationTabs(BrowserView):
     def _getNavQuery(self):
diff --git a/src/plone/volto/configure.zcml b/src/plone/volto/configure.zcml
index 8de14e0..750c602 100644
--- a/src/plone/volto/configure.zcml
+++ b/src/plone/volto/configure.zcml
@@ -22,14 +22,14 @@
 
   <browser:page
       name="blocksuuidfixer"
-      for="Products.CMFPlone.interfaces.IPloneSiteRoot"
+      for=".bbb.IPloneSiteRoot"
       class=".blocksuuidfixer.DuplicatedBlocksUUIDFixer"
       permission="cmf.ManagePortal"
       />
 
   <browser:page
       name="volto_settings"
-      for="Products.CMFPlone.interfaces.IPloneSiteRoot"
+      for=".bbb.IPloneSiteRoot"
       class=".controlpanel.VoltoSettingsControlPanel"
       permission="cmf.ManagePortal"
       />
diff --git a/src/plone/volto/setuphandlers.py b/src/plone/volto/setuphandlers.py
index 3aa3072..eac653d 100644
--- a/src/plone/volto/setuphandlers.py
+++ b/src/plone/volto/setuphandlers.py
@@ -2,12 +2,12 @@
 from importlib import import_module
 from plone import api
 from plone.dexterity.interfaces import IDexterityFTI
+from plone.volto.bbb import get_installer
 from plone.volto.default_homepage.default import default_home
 from plone.volto.default_homepage.demo import demo_home_page
 from plone.volto.default_homepage.lrf import default_lrf_home
 from Products.CMFCore.utils import getToolByName
 from Products.CMFPlone.interfaces import INonInstallable
-from Products.CMFPlone.utils import get_installer
 from zope.component import queryUtility
 from zope.interface import implementer
 
diff --git a/src/plone/volto/tests/test_migrate_to_volto.py b/src/plone/volto/tests/test_migrate_to_volto.py
index 0fe7fe5..e07cf77 100644
--- a/src/plone/volto/tests/test_migrate_to_volto.py
+++ b/src/plone/volto/tests/test_migrate_to_volto.py
@@ -3,12 +3,12 @@
 from plone.app.testing import setRoles
 from plone.app.testing import TEST_USER_ID
 from plone.app.textfield.value import RichTextValue
+from plone.volto.bbb import get_installer
 from plone.volto.content import FolderishDocument
 from plone.volto.content import FolderishEvent
 from plone.volto.content import FolderishNewsItem
 from plone.volto.testing import PLONE_6
 from plone.volto.testing import PLONE_VOLTO_MIGRATION_FUNCTIONAL_TESTING
-from Products.CMFPlone.utils import get_installer
 
 import json
 import responses
diff --git a/src/plone/volto/tests/test_setup.py b/src/plone/volto/tests/test_setup.py
index 8c4aede..718ef96 100644
--- a/src/plone/volto/tests/test_setup.py
+++ b/src/plone/volto/tests/test_setup.py
@@ -2,16 +2,9 @@
 """Setup tests for this package."""
 from importlib import import_module
 from plone import api
+from plone.volto.bbb import get_installer
 from plone.volto.testing import PLONE_VOLTO_CORE_INTEGRATION_TESTING  # noqa
 
-
-try:
-    from Products.CMFPlone.utils import get_installer
-except ImportError:  # Plone < 5.1
-    HAS_INSTALLER = False
-else:
-    HAS_INSTALLER = True
-
 import unittest
 
 
@@ -26,17 +19,11 @@ class TestSetup(unittest.TestCase):
     def setUp(self):
         """Custom shared utility setup for tests."""
         self.portal = self.layer["portal"]
-        if HAS_INSTALLER:
-            self.installer = get_installer(self.portal)
-        else:
-            self.installer = api.portal.get_tool("portal_quickinstaller")
+        self.installer = get_installer(self.portal)
 
     def test_product_installed(self):
         """Test if plone.volto is installed."""
-        if HAS_INSTALLER:
-            self.assertTrue(self.installer.is_product_installed("plone.volto"))
-        else:
-            self.assertTrue(self.installer.isProductInstalled("plone.volto"))
+        self.assertTrue(self.installer.is_product_installed("plone.volto"))
 
     def test_browserlayer(self):
         """Test that IPloneVoltoCoreLayer is registered."""
@@ -70,19 +57,12 @@ class TestUninstall(unittest.TestCase):
 
     def setUp(self):
         self.portal = self.layer["portal"]
-        if HAS_INSTALLER:
-            self.installer = get_installer(self.portal)
-            self.installer.uninstall_product("plone.volto")
-        else:
-            self.installer = api.portal.get_tool("portal_quickinstaller")
-            self.installer.uninstallProducts(["plone.volto"])
+        self.installer = get_installer(self.portal)
+        self.installer.uninstall_product("plone.volto")
 
     def test_product_uninstalled(self):
         """Test if plone.volto is cleanly uninstalled."""
-        if HAS_INSTALLER:
-            self.assertFalse(self.installer.is_product_installed("plone.volto"))
-        else:
-            self.assertFalse(self.installer.isProductInstalled("plone.volto"))
+        self.assertFalse(self.installer.is_product_installed("plone.volto"))
 
     def test_browserlayer_removed(self):
         """Test that IPloneVoltoCoreLayer is removed."""
diff --git a/src/plone/volto/transforms.py b/src/plone/volto/transforms.py
index 1635520..ef6def5 100644
--- a/src/plone/volto/transforms.py
+++ b/src/plone/volto/transforms.py
@@ -4,7 +4,7 @@
 from plone.restapi.interfaces import IBlockFieldSerializationTransformer
 from plone.restapi.interfaces import IBlockVisitor
 from plone.restapi.serializer.blocks import ResolveUIDSerializerBase
-from Products.CMFPlone.interfaces import IPloneSiteRoot
+from plone.volto.bbb import IPloneSiteRoot
 from zope.component import adapter
 from zope.component import subscribers
 from zope.interface import implementer