diff --git a/Lectures/Presentations b/Lectures/Presentations
index 2636b24..a9c827f 160000
--- a/Lectures/Presentations
+++ b/Lectures/Presentations
@@ -1 +1 @@
-Subproject commit 2636b2496fb3e44ad310ae1ce67272224764da20
+Subproject commit a9c827f4a528c97e4633173e58f1a590c85933a5