diff --git a/book/content/requirements.txt b/book/content/requirements.txt
index d6c5235f..6906ce54 100644
--- a/book/content/requirements.txt
+++ b/book/content/requirements.txt
@@ -1,5 +1,5 @@
 docutils<0.18
 ghp-import
-jupyter-book
+jupyter-book<2
 matplotlib
 numpy