diff --git a/README.md b/README.md
index 0bd26130..4c82989d 100644
--- a/README.md
+++ b/README.md
@@ -398,7 +398,7 @@ First, you'll need a basic understanding of common principles, learning about wh
 
 ### Step 1: Review the scalability video lecture
 
-[Scalability Lecture at Harvard](https://www.youtube.com/watch?v=-W9F__D3oY4)
+[Scalability Lecture at Harvard](https://www.youtube.com/watch?v=6PWTxRGh_dk)
 
 * Topics covered:
     * Vertical scaling