diff --git a/setup.cfg b/setup.cfg
index 6a30605e..d076ab0f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -98,9 +98,9 @@ widget =
 	jupyter-contrib-nbextensions>=0.7.0
 	jupyter-nbextensions-configurator>=0.6.2
 documentation =
-	sphinx>=6.2.1
+	sphinx<7
 	nb2plots>=0.6.1
-	sphinx-rtd-theme>=1.2.0
+	sphinx-rtd-theme>=1.2.1
 	sphinx-autobuild>=2021.3.14
 	sphinx-copybutton>=0.5.1
 packaging =