diff -r ad50f0399e1e -r ee1f052b45ef mercurial/configitems.py
--- a/mercurial/configitems.py	Sat Jun 02 15:55:28 2018 +0530
+++ b/mercurial/configitems.py	Sun Jun 03 17:02:38 2018 +0530
@@ -201,8 +201,6 @@
 )
 coreconfigitem('commands', 'update.check',
     default=None,
-    # Deprecated, remove after 4.4 release
-    alias=[('experimental', 'updatecheck')]
 )
 coreconfigitem('commands', 'update.requiredest',
     default=False,