diff --git a/doc/requirements.txt b/doc/requirements.txt
index 80a226d044..dd08e848cc 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 setuptools-scm>=10.3.4
-sphinx>=8.2.0,<9
+sphinx>=9.1.1,<10
 sphinx-autoapi>=3.8.1
 intersphinx_registry>=0.2609.5 # https://github.com/Quansight-Labs/intersphinx_registry/pull/58
 nbsphinx