diff --git a/python/tox.ini b/python/tox.ini
index 04b589b67..00cb6bb5f 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -62,7 +62,8 @@ commands =
 [testenv:doc]
 changedir=doc
 deps =
-    sphinx
+# Pinned version, workaround for <https://github.com/breathe-doc/breathe/issues/981>
+    sphinx==7.2.6
     breathe
     sphinx_rtd_theme
 commands =