diff --git a/requirements/CI/requirements.txt b/requirements/CI/requirements.txt
index a7afffb89..587cd1f12 100644
--- a/requirements/CI/requirements.txt
+++ b/requirements/CI/requirements.txt
@@ -4,7 +4,7 @@ pytest==9.0.2
 pytest-cov==7.0.0
 pytest-xdist==3.8.0
 setuptools-scm==9.2.2
-sphinx==8.1.3
+sphinx==9.1.0
 sphinx-argparse==0.5.2
 sphinx-issues==5.0.1
 sphinx_rtd_theme==3.1.0