diff --git a/lectures b/lectures
index f6fdfa1..53cbac3 160000
--- a/lectures
+++ b/lectures
@@ -1 +1 @@
-Subproject commit f6fdfa1b5fbb320cadc91ed550ae824263708fee
+Subproject commit 53cbac3a3759b0dc5ec4500396896209ed4b5e5e