diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9b3be53e..591858c9 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-sphinx 
+sphinx==6.1.2 
 sphinx-autobuild
 sphinx-rtd-theme 
 myst-parser