diff --git a/doc/requirements.txt b/doc/requirements.txt
index 040b1a7..2ccd987 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,7 @@
 -r ../requirements.txt
 
 # Enforce latest version on ReadTheDocs
-sphinx ~= 8.2
+sphinx ~= 9.0
 docutils ~= 0.21
 docutils_stubs ~= 0.0.22