diff --git a/requirements_dev.txt b/requirements_dev.txt
index d89621b..16eda71 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,7 +7,7 @@ setuptools-scm==3.3.3
 pytest==4.6.8
 PyYAML==5.1.2
 cryptography==2.8
-Sphinx==1.8.5
+Sphinx==8.1.2
 coverage==4.5.4
 pytest-runner==5.2
 requests>=2