diff --git a/.rtd-environment.yml b/.rtd-environment.yml
index 08beeaa..59ecf40 100644
--- a/.rtd-environment.yml
+++ b/.rtd-environment.yml
@@ -8,6 +8,7 @@ dependencies:
     - ipython
     - numpy
     - numpydoc
+    - sphinx!=3.2.0
     - xarray
     - pip
     - pip: