diff --git a/requirements_dev.txt b/requirements_dev.txt
index a3dc814..d4f66be 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==8.1.3
 twine==1.14.0
 meshio==4.3.11