fix in librarian

diff --git a/lib/librarian b/lib/librarian
index cc0a99f..84b4629 160000 (submodule)
--- a/lib/librarian
+++ b/lib/librarian
@@ -1 +1 @@
-Subproject commit cc0a99f82b1780ed842188fc22fbe18af6a9bc3b
+Subproject commit 84b462901aece7eda7ef1704c748a5e5b4b3df26