diff --git a/docs/environment.yml b/docs/environment.yml
index d45ecbbd..e0f6b5c9 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -15,7 +15,7 @@ dependencies:
   - discretize
   - pip
   - ipykernel
-  - jupyter-book
+  - jupyter-book=1.0
   - jupytext
   - notebook
   - zarr