diff --git a/requirements.txt b/requirements.txt
index c69e663..6b0809a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ rstcheck==6.2.5
 rstcheck-core==1.2.2
 six==1.17.0
 snowballstemmer==3.0.1
-Sphinx==8.0.2
+Sphinx==9.0.4
 sphinx-rtd-theme==3.0.2
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0