diff --git a/IPython/testing/ipunittest.py b/IPython/testing/ipunittest.py
index 5a940a5..879b86b 100644
--- a/IPython/testing/ipunittest.py
+++ b/IPython/testing/ipunittest.py
@@ -36,6 +36,7 @@ Authors
 
 # Stdlib
 import re
+import sys
 import unittest
 from doctest import DocTestFinder, DocTestRunner, TestResults
 from IPython.terminal.interactiveshell import InteractiveShell
@@ -49,7 +50,10 @@ def count_failures(runner):
 
     Code modeled after the summarize() method in doctest.
     """
-    return [TestResults(f, t) for f, t in runner._name2ft.values() if f > 0 ]
+    if sys.version_info < (3, 13):
+        return [TestResults(f, t) for f, t in runner._name2ft.values() if f > 0]
+    else:
+        return [TestResults(f, t) for f, t in runner._stats.values() if f > 0]
 
 
 class IPython2PythonConverter(object):