diff --git a/_quarto.yml b/_quarto.yml
index 983ad4a..4768ee9 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -12,8 +12,8 @@ book:
       Çetinkaya-Rundel, and Garrett Grolemund.
     right: |
       This book was built with <a href="https://quarto.org/">Quarto</a>.
-  cover-image: cover.png
-  favicon: cover.png
+  cover-image: cover.jpg
+  favicon: cover.jpg
   site-url: https://r4ds.hadley.nz/
   repo-url: https://github.com/hadley/r4ds/
   repo-branch: main
diff --git a/cover.jpg b/cover.jpg
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diff --git a/cover.png b/cover.png
deleted file mode 100644
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