diff --git a/requirements_dev.txt b/requirements_dev.txt
index 23ec5c0..62baeba 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.7
 tox==3.7.0
 coverage==4.5.2
-Sphinx==1.8.4
+Sphinx==8.1.1
 twine==1.13.0
 
 pytest==4.3.0