diff --git a/.circleci/requirements-sphinx.txt b/.circleci/requirements-sphinx.txt
index 5f9822ed1e6..58aac6fbf64 100644
--- a/.circleci/requirements-sphinx.txt
+++ b/.circleci/requirements-sphinx.txt
@@ -4,7 +4,7 @@ numpy
 rdflib
 reportlab
 scipy
-sphinx>=3.5.0
+sphinx==4.1.2
 numpydoc==1.0.0
 pygments
 sphinx_rtd_theme