--- a/mercurial/sparse.py	Tue Nov 16 17:35:57 2021 +0000
+++ b/mercurial/sparse.py	Mon Nov 29 12:27:33 2021 +0000
@@ -718,7 +718,7 @@
 
     The new config is written out and a working directory refresh is performed.
     """
-    with repo.wlock(), repo.dirstate.parentchange():
+    with repo.wlock(), repo.lock(), repo.dirstate.parentchange():
         raw = repo.vfs.tryread(b'sparse')
         oldinclude, oldexclude, oldprofiles = parseconfig(
             repo.ui, raw, b'sparse'