diff -r 806ca6bd0719 -r 2cf264e9aa75 mercurial/configitems.py
--- a/mercurial/configitems.py	Mon Feb 27 19:59:55 2023 -0500
+++ b/mercurial/configitems.py	Mon Feb 27 23:04:09 2023 -0500
@@ -969,7 +969,7 @@
 coreconfigitem(
     b'experimental',
     b'changegroup3',
-    default=False,
+    default=True,
 )
 coreconfigitem(
     b'experimental',