diff --git a/index.html b/index.html
index 20d6655..29ac134 100644
--- a/index.html
+++ b/index.html
@@ -40,11 +40,11 @@ To be published by MIT Press.
 <br>
 Citation:
 <pre><code>
- @book{prince2022understanding,
+ @book{prince2023understanding,
  author = "Simon J.D. Prince",
  title = "Understanding Deep Learning",
  publisher = "MIT Press",
- year = 2022,
+ year = 2023,
  url = "https://udlbook.github.io/udlbook/"
 }
 </code></pre>