diff --git a/docker/environment.yml b/docker/environment.yml
index 22dc982..d5c6fd6 100644
--- a/docker/environment.yml
+++ b/docker/environment.yml
@@ -39,7 +39,7 @@ dependencies:
   - "maplibre"
 
   # Publishing
-  - "mystmd"
+  - "mystmd >=1.6.6"
   - "typst"
   - "jupyter-myst-build-proxy >=0.5.1"