diff --git a/lectures/house_auction.md b/lectures/house_auction.md
index 16c7a365e..003fce2a7 100644
--- a/lectures/house_auction.md
+++ b/lectures/house_auction.md
@@ -17,7 +17,7 @@ kernelspec:
 ---
 tags: [hide-output]
 ---
-!pip install prettytable
+!pip install -U prettytable wcwidth
 ```
 
 ##  Overview