diff --git a/requirements/documentation.txt b/requirements/documentation.txt
index 294713e1..fedfbbaa 100644
--- a/requirements/documentation.txt
+++ b/requirements/documentation.txt
@@ -3,7 +3,7 @@
 
 furo==2024.*
 myst-parser[linkify]>=0.13,<3.1
-sphinx>=3.1,<8
+sphinx>=3.1,<9
 sphinx-autobuild==2024.9.19
 sphinx-copybutton>=0.2,<1
 sphinx-design>=0.6.0,<0.7