diff --git a/kallithea/lib/webutils.py b/kallithea/lib/webutils.py
--- a/kallithea/lib/webutils.py
+++ b/kallithea/lib/webutils.py
@@ -20,6 +20,7 @@ thread-local "global" variables. It shou
 imported anywhere - just like the global variables can be used everywhere.
 """
 
+import collections
 import datetime
 import json
 import logging
@@ -66,6 +67,10 @@ assert truncate
 assert wrap_paragraphs
 
 
+# work around webhelpers2 being a dead project that doesn't support Python 3.10
+collections.Sequence = collections.abc.Sequence
+
+
 #
 # General Kallithea URL handling
 #