diff --git a/requirements_dev.txt b/requirements_dev.txt
index bed373f..4f17484 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,5 +3,5 @@ coverage==4.5.4
 flake8==3.7.9
 pytest==5.3.1
 pytz==2019.3
-Sphinx==2.2.2
+Sphinx==8.1.2
 tox==3.14.2