diff --git a/pyproject.toml b/pyproject.toml
index 57907ce..33b1c83 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ dev = [
     "build",
     "setuptools",
     "wheel",
-    "Sphinx>=4.3.0,<8.3.0",
+    "Sphinx>=4.3.0,<9.2.0",
     "furo==2025.9.25",
 
     "myst-parser>=1.0,<4.1",