diff --git a/README.md b/README.md
index 68070b3..4375546 100644
--- a/README.md
+++ b/README.md
@@ -50,5 +50,5 @@ end of this class worth 5% of your grade. Today's lecture will be delivered
 remotely by a prestigous MIT professor, course notes are available
 [here](https://missing.csail.mit.edu/2020/course-shell/).
 
-[![Introduction to the shell](https://img.youtube.com/vi/Z56Jmr9Z34Q/maxresdefault.jpg)](https://youtu.be/Z56Jmr9Z34Q)
+[![Introduction to the shell](https://img.youtube.com/vi/Z56Jmr9Z34Q/hqdefault.jpg)](https://youtu.be/Z56Jmr9Z34Q)