diff --git a/requirements_dev.txt b/requirements_dev.txt
index 30dbdc2..6f24bb5 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.6.0
 tox==3.13.2
 coverage==4.5.4
 pytest-aiohttp==0.3.0
-Sphinx==2.1.2
+Sphinx==8.1.3
 cryptography==2.7
 PyYAML==5.1.2
 pytest==5.0.1