diff --git a/requirements_dev.txt b/requirements_dev.txt
index f52f489f..ea603b3e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -40,7 +40,7 @@ pydata-sphinx-theme>=0.13.3
 pytest
 qutip==4.7.3
 sax==0.8.8  # Pinned for pydantic <v2 compatibility.
-sphinx>=4,<7
+sphinx>=4,<8
 sphinx-autoapi
 sphinx-autobuild
 sphinx_autodoc_typehints