diff --git a/requirements/local.txt b/requirements/local.txt
index a1a2ed4..829e791 100644
--- a/requirements/local.txt
+++ b/requirements/local.txt
@@ -12,7 +12,7 @@ pytest-sugar==0.9.4  # https://github.com/Frozenball/pytest-sugar
 
 # Documentation
 # ------------------------------------------------------------------------------
-sphinx==3.3.0  # https://github.com/sphinx-doc/sphinx
+sphinx==8.1.3  # https://github.com/sphinx-doc/sphinx
 sphinx-autobuild==2020.9.1 # https://github.com/GaretJax/sphinx-autobuild
 
 # Code quality