diff --git a/requirements_dev.txt b/requirements_dev.txt
index 697e5a5..de3e97c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.8
 tox==3.14.0
 coverage==4.5.4
-Sphinx==1.8.5
+Sphinx==8.1.2
 twine==1.14.0
 pytest==4.6.5
 pytest-runner==5.1