diff --git a/payment_manual/indico_payment_manual/placeholders.py b/payment_manual/indico_payment_manual/placeholders.py
index 739b586..8faa7b4 100644
--- a/payment_manual/indico_payment_manual/placeholders.py
+++ b/payment_manual/indico_payment_manual/placeholders.py
@@ -7,8 +7,7 @@
 
 
 from decimal import Decimal
-
-from six.moves.urllib.parse import quote_plus
+from urllib.parse import quote_plus
 
 from indico.modules.events.registration.placeholders.registrations import IDPlaceholder
 from indico.util.placeholders import ParametrizedPlaceholder, Placeholder
diff --git a/piwik/indico_piwik/queries/metrics.py b/piwik/indico_piwik/queries/metrics.py
index 4e235a5..75cce99 100644
--- a/piwik/indico_piwik/queries/metrics.py
+++ b/piwik/indico_piwik/queries/metrics.py
@@ -7,8 +7,7 @@
 
 
 from operator import itemgetter
-
-from six.moves.urllib.parse import quote
+from urllib.parse import quote
 
 from indico_piwik.queries.base import PiwikQueryReportEventBase
 from indico_piwik.queries.utils import get_json_from_remote_server, reduce_json, stringify_seconds
@@ -34,9 +33,7 @@ class PiwikQueryReportEventMetricVisitsBase(PiwikQueryReportEventMetricBase):
 
 class PiwikQueryReportEventMetricDownloads(PiwikQueryReportEventMetricBase):
     def call(self, download_url, **query_params):
-        return super().call(method='Actions.getDownload',
-                                                                      downloadUrl=quote(download_url),
-                                                                      **query_params)
+        return super().call(method='Actions.getDownload', downloadUrl=quote(download_url), **query_params)
 
     def get_result(self, download_url):
         result = get_json_from_remote_server(self.call, download_url=download_url, segmentation_enabled=False)
diff --git a/piwik/indico_piwik/queries/tracking.py b/piwik/indico_piwik/queries/tracking.py
index 40019d8..0962a24 100644
--- a/piwik/indico_piwik/queries/tracking.py
+++ b/piwik/indico_piwik/queries/tracking.py
@@ -6,8 +6,7 @@
 # see the LICENSE file for more details.
 
 from datetime import datetime
-
-from six.moves.urllib.parse import quote
+from urllib.parse import quote
 
 from indico.core.celery import celery
 
diff --git a/vc_vidyo/indico_vc_vidyo/models/vidyo_extensions.py b/vc_vidyo/indico_vc_vidyo/models/vidyo_extensions.py
index 0765532..5553cf6 100644
--- a/vc_vidyo/indico_vc_vidyo/models/vidyo_extensions.py
+++ b/vc_vidyo/indico_vc_vidyo/models/vidyo_extensions.py
@@ -5,10 +5,8 @@
 # them and/or modify them under the terms of the MIT License;
 # see the LICENSE file for more details.
 
+from urllib.parse import urlencode
 
-import six.moves.urllib.error
-import six.moves.urllib.parse
-import six.moves.urllib.request
 from sqlalchemy.event import listens_for
 from sqlalchemy.orm.attributes import flag_modified
 
@@ -62,7 +60,7 @@ class VidyoExtension(db.Model):
         url = self.vc_room.data['url']
         custom_url_tpl = VidyoPlugin.settings.get('client_chooser_url')
         if custom_url_tpl:
-            return custom_url_tpl + '?' + six.moves.urllib.parse.urlencode({'url': url})
+            return custom_url_tpl + '?' + urlencode({'url': url})
         return url
 
     def __repr__(self):