diff --git a/python/mozrelease/mozrelease/paths.py b/python/mozrelease/mozrelease/paths.py
index b3d48c4ac7ba..9c186a7fdbb8 100644
--- a/python/mozrelease/mozrelease/paths.py
+++ b/python/mozrelease/mozrelease/paths.py
@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-from six.moves.urllib.parse import urlunsplit
+from urllib.parse import urlunsplit
 
 product_ftp_map = {
     "fennec": "mobile",
diff --git a/python/mozrelease/mozrelease/update_verify.py b/python/mozrelease/mozrelease/update_verify.py
index 49fe21db1551..29b970e42ce4 100644
--- a/python/mozrelease/mozrelease/update_verify.py
+++ b/python/mozrelease/mozrelease/update_verify.py
@@ -6,8 +6,6 @@
 import os
 import re
 
-from six import string_types
-
 from .chunking import getChunk
 
 
@@ -187,9 +185,9 @@ class UpdateVerifyConfig(object):
                 "Couldn't add release identified by build_id '%s' and from_path '%s': "
                 "already exists in config" % (build_id, from_path)
             )
-        if isinstance(locales, string_types):
+        if isinstance(locales, str):
             locales = sorted(list(locales.split()))
-        if isinstance(patch_types, string_types):
+        if isinstance(patch_types, str):
             patch_types = list(patch_types.split())
         self.releases.append(
             {