diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9b2909bb47d..47ae7b87b25 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -21,6 +21,12 @@ squarify
 scikit-image==0.18.1
 scikit-learn
 sphinx==3.5.4
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.0
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.5
+sphinxcontrib-jsmath==1.0.1
 sphinx_bootstrap_theme
 recommonmark
 pathlib
diff --git a/release.md b/release.md
index 32c575821ee..bc879a01708 100644
--- a/release.md
+++ b/release.md
@@ -270,4 +270,3 @@ From `packages/python/plotly-geo`, build the conda package
 ```
 
 Then upload to the plotly anaconda channel as described above.
-