diff --git a/pyproject.toml b/pyproject.toml
index 44a23c5..7d6ae22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ isort = ">=5.13.2,<7.0.0"
 optional = true
 
 [tool.poetry.group.docs.dependencies]
-sphinx = ">=6,<8"
+sphinx = ">=6,<9"
 sphinx-rtd-theme = ">=1.3,<4.0"
 expiringdict = ">=1.1.4"
 pyrfc3339 = ">=1.0"