diff -r 640d5b3bd060 -r 97ebdb192b00 mercurial/manifest.py
--- a/mercurial/manifest.py	Sun Apr 05 13:12:05 2020 +0200
+++ b/mercurial/manifest.py	Sun Apr 05 18:32:46 2020 +0200
@@ -1951,6 +1951,9 @@
     def rev(self, node):
         return self._rootstore.rev(node)
 
+    def update_caches(self, transaction):
+        return self._rootstore._revlog.update_caches(transaction=transaction)
+
 
 @interfaceutil.implementer(repository.imanifestrevisionwritable)
 class memmanifestctx(object):