diff --git a/third_party/requirements.txt b/third_party/requirements.txt
index ac316e2ad..7ea2eb27b 100644
--- a/third_party/requirements.txt
+++ b/third_party/requirements.txt
@@ -13,5 +13,5 @@ sphinxcontrib_htmlhelp==2.1.0
 sphinxcontrib_serializinghtml==2.0.0
 sphinxcontrib_qthelp==2.0.0
 breathe==4.35.0
-sphinx==8.0.2
+sphinx==8.1.0
 sphinx_book_theme==1.1.3