diff --git a/Lectures/Presentations b/Lectures/Presentations
index bc6016f0..480b999c 160000
--- a/Lectures/Presentations
+++ b/Lectures/Presentations
@@ -1 +1 @@
-Subproject commit bc6016f054db3cac6ab840416f6297b0ad50383c
+Subproject commit 480b999cf20b7f8dc2454ee0bc70d86acabc143c