diff --git a/docs/environment.yml b/docs/environment.yml
index e54b19fd..7b262781 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -11,6 +11,7 @@ dependencies:
 - sphinx_rtd_theme
 - tornado
 - entrypoints
+- pymt
 - pip:
     - nbsphinx>=0.2.12
     - sphinxcontrib_github_alt