fix in librarian

diff --git a/lib/librarian b/lib/librarian
index c3cfacb..84b4629 160000 (submodule)
--- a/lib/librarian
+++ b/lib/librarian
@@ -1 +1 @@
-Subproject commit c3cfacbfd878f8a26750f22f701f4ac23fa98163
+Subproject commit 84b462901aece7eda7ef1704c748a5e5b4b3df26