diff --git a/requirements.txt b/requirements.txt
index 86c54bd8200..3f6e1b0d5b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ requests==2.32.5
 rst2pdf==0.103.1
 smartypants==2.0.2
 snowballstemmer==3.0.1
-Sphinx==8.1.3
+Sphinx==9.0.0
 sphinx-copybutton==0.5.2
 sphinx-rtd-theme==3.0.2
 sphinx-rtd-dark-mode==1.3.0