diff --git a/docs/python_docs/environment.yml b/docs/python_docs/environment.yml
index 5f66d7715af9..7d9d42d3d662 100644
--- a/docs/python_docs/environment.yml
+++ b/docs/python_docs/environment.yml
@@ -23,7 +23,7 @@ dependencies:
 - pip
 - python
 - jupyter
-- sphinx
+- sphinx==2.2.2
 - matplotlib
 - notebook
 - pip: