diff --git a/pyproject.toml b/pyproject.toml
index 76f30ce..ca06890 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 docs = [
-    "Sphinx>=7.2.6,<8.0",
+    "Sphinx>=7.2.6,<9.0",
     "sphinx-rtd-theme>=2.0.0,<3.0"
 ]
 tests = [