1 files changed, 3 insertions, 5 deletions
diff --git a/synapse/util/caches/treecache.py b/synapse/util/caches/treecache.py
index 2ea4e4e911..eb4d98f683 100644
--- a/synapse/util/caches/treecache.py
+++ b/synapse/util/caches/treecache.py
@@ -1,11 +1,9 @@
 from typing import Dict
 
-from six import itervalues
-
 SENTINEL = object()
 
 
-class TreeCache(object):
+class TreeCache:
     """
     Tree-based backing store for LruCache. Allows subtrees of data to be deleted
     efficiently.
@@ -81,7 +79,7 @@ def iterate_tree_cache_entry(d):
     can contain dicts.
     """
     if isinstance(d, dict):
-        for value_d in itervalues(d):
+        for value_d in d.values():
             for value in iterate_tree_cache_entry(value_d):
                 yield value
     else:
@@ -91,7 +89,7 @@ def iterate_tree_cache_entry(d):
             yield d
 
 
-class _Entry(object):
+class _Entry:
     __slots__ = ["value"]
 
     def __init__(self, value):