diff --git a/requirements.txt b/requirements.txt
index 763cd4f5673..5bbb4818b18 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # Requirements for building PEPs with Sphinx
 Pygments >= 2.9.0
-Sphinx >= 5.1.1
+Sphinx >= 5.1.1,<=6.0.0
 docutils >= 0.19.0
 
 # For RSS