diff --git a/docs/requirements.txt b/docs/requirements.txt
index 641a25c9..336311cb 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 sphinx>=4.0
-sphinx-book-theme
+sphinx-book-theme==0.3.3
 sphinx-gallery
 myst_nb
 pbr