diff --git a/requirements_dev.txt b/requirements_dev.txt
index 91575591..481f1c79 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -38,7 +38,7 @@ pytest
 qutip==4.7.3
 sax==0.8.8  # Pinned for pydantic <v2 compatibility.
 setuptools>=40.8.0
-sphinx>=4,<7
+sphinx>=4,<8
 sphinx-autoapi
 sphinx-autobuild
 sphinx_autodoc_typehints