diff --git a/pyproject.toml b/pyproject.toml
index 6301986b..63226ed9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ dev = [
     "build",
     "setuptools",
     "wheel",
-    "Sphinx>=4.3.0,<7.1.0",
+    "Sphinx>=4.3.0,<9.2.0",
     "furo==2023.7.26",
     "myst-parser>=1.0,<2.1",
     "sphinx-copybutton==0.5.2",