diff --git a/requirements_dev.txt b/requirements_dev.txt
index b622f2ab..b3b41b12 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.7
 tox==3.9.0
 coverage==4.5.3
-Sphinx==2.0.1
+Sphinx==8.1.3
 twine==1.13.0
 sphinx_rtd_theme==0.4.3
 pytest==4.5.0