diff --git a/openpgp/modules/openpgp.py b/openpgp/modules/openpgp.py
index 6054e82..88e41e8 100644
--- a/openpgp/modules/openpgp.py
+++ b/openpgp/modules/openpgp.py
@@ -18,7 +18,7 @@ import time
 import logging
 from pathlib import Path
 
-import nbxmpp
+from nbxmpp.namespaces import Namespace
 from nbxmpp import Node
 from nbxmpp import StanzaMalformed
 from nbxmpp.util import is_error_result
@@ -72,7 +72,7 @@ class OpenPGP(BaseModule):
         self.handlers = [
             StanzaHandler(name='message',
                           callback=self.decrypt_message,
-                          ns=nbxmpp.NS_OPENPGP,
+                          ns=Namespace.OPENPGP,
                           priority=9),
         ]
 
@@ -133,7 +133,7 @@ class OpenPGP(BaseModule):
         log.info('%s => Publish keylist', self._account)
         self._nbxmpp('OpenPGP').set_keylist(keylist)
 
-    @event_node(nbxmpp.NS_OPENPGP_PK)
+    @event_node(Namespace.OPENPGP_PK)
     def _keylist_notification_received(self, _con, _stanza, properties):
         if properties.pubsub_event.retracted:
             return
diff --git a/openpgp/modules/util.py b/openpgp/modules/util.py
index 6c759d9..d46ca7e 100644
--- a/openpgp/modules/util.py
+++ b/openpgp/modules/util.py
@@ -17,17 +17,17 @@
 from enum import IntEnum
 from collections import namedtuple
 
-import nbxmpp
+from nbxmpp.namespaces import Namespace
 
 
 ENCRYPTION_NAME = 'OpenPGP'
 
 NOT_ENCRYPTED_TAGS = [
-    ('no-store', nbxmpp.NS_MSG_HINTS),
-    ('store', nbxmpp.NS_MSG_HINTS),
-    ('no-copy', nbxmpp.NS_MSG_HINTS),
-    ('no-permanent-store', nbxmpp.NS_MSG_HINTS),
-    ('origin-id', nbxmpp.NS_SID),
+    ('no-store', Namespace.HINTS),
+    ('store', Namespace.HINTS),
+    ('no-copy', Namespace.HINTS),
+    ('no-permanent-store', Namespace.HINTS),
+    ('origin-id', Namespace.SID),
     ('thread', None)
 ]
 
@@ -42,7 +42,7 @@ class Trust(IntEnum):
 
 
 def prepare_stanza(stanza, payload):
-    delete_nodes(stanza, 'openpgp', nbxmpp.NS_OPENPGP)
+    delete_nodes(stanza, 'openpgp', Namespace.OPENPGP)
     delete_nodes(stanza, 'body')
 
     nodes = [(node.getName(), node.getNamespace()) for node in payload]
@@ -56,7 +56,7 @@ def prepare_stanza(stanza, payload):
 def delete_nodes(stanza, name, namespace=None):
     attrs = None
     if namespace is not None:
-        attrs = {'xmlns': nbxmpp.NS_OPENPGP}
+        attrs = {'xmlns': Namespace.OPENPGP}
     nodes = stanza.getTags(name, attrs)
     for node in nodes:
         stanza.delChild(node)
diff --git a/openpgp/pgpplugin.py b/openpgp/pgpplugin.py
index ad7843e..bc62dbc 100644
--- a/openpgp/pgpplugin.py
+++ b/openpgp/pgpplugin.py
@@ -20,7 +20,7 @@ from pathlib import Path
 
 from gi.repository import Gtk
 from gi.repository import Gdk
-import nbxmpp
+from nbxmpp.namespaces import Namespace
 from nbxmpp import JID
 
 from gajim.common import app
@@ -129,7 +129,7 @@ class OpenPGPPlugin(GajimPlugin):
 
     @staticmethod
     def _update_caps(_account, features):
-        features.append('%s+notify' % nbxmpp.NS_OPENPGP_PK)
+        features.append('%s+notify' % Namespace.OPENPGP_PK)
 
     def activate_encryption(self, chat_control):
         account = chat_control.account