diff --git a/docs/requirements.txt b/docs/requirements.txt
index b497855c3e..0c79071fc2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
-jupyter-book
+jupyter-book < 2
 matplotlib
 numpy
 ghp-import
-ford
\ No newline at end of file
+ford