diff --git a/ci/312.yml b/ci/312.yml
index 50d2bba..869327c 100644
--- a/ci/312.yml
+++ b/ci/312.yml
@@ -35,5 +35,6 @@ dependencies:
   - myst-parser
   - sphinx-autodoc2
   - nbsphinx-link
+  - linkify-it-py
   - pip:
     - nbsphinx-link>=1.3.1 # not on conda yet
\ No newline at end of file
diff --git a/ci/313-dev.yml b/ci/313-dev.yml
index 0102d94..2968edc 100644
--- a/ci/313-dev.yml
+++ b/ci/313-dev.yml
@@ -25,6 +25,7 @@ dependencies:
   - sphinx>=1.4.3
   - sphinxcontrib-bibtex
   - sphinx_bootstrap_theme
+  - linkify-it-py
   - numpydoc
   - nbsphinx
   - joblib