diff --git a/docs/doc_requires.txt b/docs/doc_requires.txt
index fd5432e..912b984 100644
--- a/docs/doc_requires.txt
+++ b/docs/doc_requires.txt
@@ -1,4 +1,4 @@
-sphinx~=7.4
+sphinx~=8.1
 nbsphinx~=0.9
 pygments~=2.18
 shibuya~=2024.7