diff --git a/square.py b/square.py
index c5f1cac..0743b92 100644
--- a/square.py
+++ b/square.py
@@ -10,7 +10,7 @@ def square(side_length):
     forward(side_length)
     right(90)
 
-sizes = [20, 40, 60, 80, 100]
+sizes = [20, 40, 60, 80, 100, 120]
 for size in sizes:
     square(size)