diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3719884..75b4957 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ flake8==3.7.7
 pytest-mypy==0.3.2
 tox==3.12.1
 coverage==4.5.3
-Sphinx==2.1.0
+Sphinx==8.1.3
 twine==1.13.0
 pytest==4.6.0
 pytest-runner==5.1