diff --git a/doc/requirements.txt b/doc/requirements.txt
index 25917fd..d67e1fe 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -3,7 +3,7 @@
 pyTooling>=2.12.0
 
 # Enforce latest version on ReadTheDocs
-sphinx>=5.3.0, <6.0
+sphinx>=5.3.0, <7.0
 
 # Sphinx Extenstions
 #sphinx.ext.coverage