diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index 5fe9b43..6ba0747 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,5 +1,5 @@
 # Requirements to build hpcss' documentation.
 
-sphinx >=5.0, <8.0
+sphinx >=5.0, <9.0
 sphinx-rtd-theme >=1.0, <3.0
 tomlkit >=0.1, < 1.0