diff --git a/requirements.txt b/requirements.txt
index 6a86b7bed..ba112c5e4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # These dependencies should be installed using pip in order
 # to build the documentation.
-sphinx==8.2.3
+sphinx==9.1.0
 sphinxcontrib-programoutput==0.18
 sphinx-copybutton==0.5.2
 sphinx_design==0.6.1