diff --git a/pyproject.toml b/pyproject.toml
index 3ce0d867..1e9c22cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -85,7 +85,7 @@ test = [
     "pytest-env ==1.7.1",
 ]
 docs = [
-    "sphinx >=5.1.1,<9.0.0",
+    "sphinx >=5.1.1,<10.0.0",
     "sphinx-markdown-builder >=0.6.10,<1.0.0",
 ]
 dist = [