latest version of sphinx

Author: Ladislav Chvastaš

tox.ini

@@ -126,7 +126,9 @@ description =
 basepython = python3
 usedevelop = True
 changedir = doc/en
-deps = -r{toxinidir}/doc/en/requirements.txt
+deps =
+    -r{toxinidir}/doc/en/requirements.txt
+    sphinx>=8.1.3
 commands =
     sphinx-build -W -q --keep-going -b linkcheck . _build
 setenv =
@@ -143,7 +145,7 @@ passenv =
 deps =
     PyYAML
     regendoc>=0.8.1
-    sphinx
+    sphinx>=8.1.3
 allowlist_externals =
     make
 commands =