diff --git a/docker/environment.yml b/docker/environment.yml
index d5c6fd6..bd5345e 100644
--- a/docker/environment.yml
+++ b/docker/environment.yml
@@ -6,7 +6,7 @@ dependencies:
   - "jupyterlab>=4.4.2"
 
   # Some cool extensions
-  - "jupyterlab-favorites"
+  - "jupyterlab-favorites <3.3.0"  # 3.3.0 seems to introduce a bug duplicating headers in Notebook Markdown cells (https://github.com/jupyterlab-contrib/jupyterlab-favorites/issues/35)
   - "jupyter-collaboration>=3,<4"
   - "jupyter-server-proxy"
   - "jupyterlab-myst"