diff --git a/.readthedocs.yml b/.readthedocs.yml
index e80b499b..3a59b97e 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -19,3 +19,4 @@ python:
    install:
       - method: setuptools
         path: .
+      - requirements: doc/requirements.txt
diff --git a/doc/requirements.txt b/doc/requirements.txt
index f0fbda02..305381a5 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,6 @@
 nose
 numpy
 pandas
-sphinx_rtd_theme>=0.3.1
+sphinx_rtd_theme=1.0.0
+sphinx=4.2
+docutils<0.18