diff --git a/_data/materials.yaml b/_data/materials.yaml
index 76c66d2c..7d68dfce 100644
--- a/_data/materials.yaml
+++ b/_data/materials.yaml
@@ -108,7 +108,7 @@
 - id: 9
   date: 4/4/2022
   beginner-name: Version Control and Backups
-  beginner-slides: https://docs.google.com/presentation/d/1NxdvuLkWSzRvtnj41AkvGU00ub_XUbk8wlIxWxm0ok4/edit
+  beginner-slides: https://docs.google.com/presentation/d/18BQc1AyNBsOE-zu_EPG52PsMsQ_uRLF_0s266jaApAM/edit
   beginner-video: https://youtu.be/X4yGMr9c64U
   advanced-name: Advanced Security
   advanced-slides: https://docs.google.com/presentation/d/12ypck2LSIaNGq5RpLmIb4gbAX-GP2pCSgf4l9VMuq1k/edit