diff --git a/docs/requirements.txt b/docs/requirements.txt
index 30cf1da..63a5ed4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -8,7 +8,7 @@ ipywidgets>=8.0.0
 nbsphinx>=0.8.1,<0.8.7
 pyenchant>=3.1.1
 requests
-sphinx>=3.5.4,<=4.0.0
+sphinx>=3.5.4,<=7.0.1
 sphinx-autodoc-annotation
 sphinx-autodoc-typehints>=1.10.3
 sphinx_gallery>=0.8.2,<0.11 # https://github.com/spatialaudio/nbsphinx/pull/666