diff --git a/pyproject.toml b/pyproject.toml
index 8d7749b08..7a2889cc1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ jinja2 = "~2.11"
 lxml = "^4.3"
 markdown = "~3.3.4"
 typogrify = "^2.0"
-sphinx = "^3.0"
+sphinx = "<4.4.0"
 sphinx_rtd_theme = "^0.5"
 livereload = "^2.6"
 psutil = {version = "^5.7", optional = true}
diff --git a/requirements/docs.pip b/requirements/docs.pip
index bd25c939e..a5a184efa 100644
--- a/requirements/docs.pip
+++ b/requirements/docs.pip
@@ -1,3 +1,3 @@
-sphinx
+sphinx<4.4.0
 sphinx_rtd_theme
 livereload