diff --git a/cli_docs/conf.py b/cli_docs/conf.py
index 45a428c..89a5263 100644
--- a/cli_docs/conf.py
+++ b/cli_docs/conf.py
@@ -24,7 +24,7 @@ release = "0.4.0"
 
 # If your documentation needs a minimal Sphinx version, state it here.
 #
-needs_sphinx = '3.5.4'
+needs_sphinx = '4.2.0'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
diff --git a/cli_docs/requirements.txt b/cli_docs/requirements.txt
index 8f6a01e..8c3cd9b 100644
--- a/cli_docs/requirements.txt
+++ b/cli_docs/requirements.txt
@@ -1,4 +1,4 @@
 # docs
-sphinx==3.5.4  # newer versions display function names in the wrong color?
+sphinx==4.2.0  # newer versions display function names in the wrong color?
 sphinx_rtd_theme==0.5.2
 Jinja2<3.1  # https://github.com/readthedocs/readthedocs.org/issues/9038
diff --git a/requirements.txt b/requirements.txt
index eac8a48..4407968 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 -e .
 
 # docs
-sphinx==3.5.4  # newer versions display function names in the wrong color?
+sphinx==4.2.0  # newer versions display function names in the wrong color?
 sphinx_rtd_theme==0.5.2
 Jinja2<3.1  # https://github.com/readthedocs/readthedocs.org/issues/9038