diff --git a/Lessons/lesson1.qmd b/Lessons/lesson1.qmd
index 9b5b8f0..e809e22 100644
--- a/Lessons/lesson1.qmd
+++ b/Lessons/lesson1.qmd
@@ -46,7 +46,7 @@ You'll see that fast.ai's way of teaching is very different to what you might be
 
 - How to learn - highly recommended books for fast.ai students
   - [Meta Learning](https://radekosmulski.gumroad.com/l/learn_deep_learning)
-  - [A Mathematician's Lament](https://www.maa.org/external_archive/devlin/LockhartsLament.pdf) by Paul Lockhart
+  - [A Mathematician's Lament](https://maa.org/sites/default/files/pdf/devlin/LockhartsLament.pdf) by Paul Lockhart
   - [Making Learning Whole](http://www.pz.harvard.edu/resources/making-learning-whole-how-seven-principles-of-teaching-can-transform-education) by David Perkins
 - Jupyter
   - Presentations: [RISE](https://rise.readthedocs.io/en/stable/)