diff --git a/docs/requirements.txt b/docs/requirements.txt
index f86f2ee3..b0233190 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,5 +3,5 @@ numpy>=1.9
 
 # Note: beware of https://github.com/readthedocs/sphinx_rtd_theme/issues/1115
 # and broken behavior with docutils 0.17
-Sphinx==4.5.0
-docutils<0.17
+sphinx>=4.3.0
+sphinx-rtd-theme>=0.5.1