diff --git a/py.requirements/docs.txt b/py.requirements/docs.txt
index 3588968..2fd3a0c 100644
--- a/py.requirements/docs.txt
+++ b/py.requirements/docs.txt
@@ -24,7 +24,7 @@
 # MAYBE: bootstrap4
 
 sphinx >= 7.3.7;   python_version >= '3.7'
-sphinx >=1.6,<4.4; python_version < '3.7'
+sphinx >=8.1,<9; python_version < '3.7'
 sphinx-autobuild
 
 sphinxcontrib-programoutput >=0.8,<0.10.0