diff --git a/requirements.txt b/requirements.txt
index 78566bd..b9fdab6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx>=2.4.3
+Sphinx>=9.1.0
 sphinx_rtd_theme
 breathe>=4.14
 sphinxcontrib_bibtex