diff --git a/content/x_y-squared.npz b/content/x_y-squared.npz
index 6c32f196..e32d05c4 100644
Binary files a/content/x_y-squared.npz and b/content/x_y-squared.npz differ
diff --git a/environment.yml b/environment.yml
index 137b04ca..509d1bc7 100644
--- a/environment.yml
+++ b/environment.yml
@@ -5,6 +5,7 @@ dependencies:
   # For running the tutorials
   - numpy
   - scipy
+  - pooch
   - matplotlib
   - pandas
   - imageio