diff --git a/requirements_doc.txt b/requirements_doc.txt
index 225c24b..711bf3f 100644
--- a/requirements_doc.txt
+++ b/requirements_doc.txt
@@ -1,3 +1,3 @@
-sphinx==3.2.1
+sphinx==8.1.1
 sphinx-rtd-theme==0.5.0
 sphinx_issues==1.2.0