diff -Nur a/pympler/util/bottle.py b/pympler/util/bottle.py
--- a/pympler/util/bottle.py	2019-04-07 00:39:01.308185000 +0800
+++ b/pympler/util/bottle.py	2022-05-17 10:10:10.356385260 +0800
@@ -84,7 +84,10 @@
     from urllib.parse import urlencode, quote as urlquote, unquote as urlunquote
     urlunquote = functools.partial(urlunquote, encoding='latin1')
     from http.cookies import SimpleCookie
-    from collections import MutableMapping as DictMixin
+    try:
+        from collections.abc import MutableMapping as DictMixin
+    except:
+        from collections import MutableMapping as DictMixin
     import pickle
     from io import BytesIO
     from configparser import ConfigParser