diff --git a/pyproject.toml b/pyproject.toml
index 9b987e27..3208da1f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,7 +66,7 @@ dev = [
   "mypy==v1.4.1 ; python_version>='3.7' and python_version<'3.8'",
   "mypy==v1.11.2 ; python_version>='3.8'",
   # Docs.
-  "Sphinx==7.3.7 ; python_version>='3.9'",
+  "Sphinx==8.0.2 ; python_version>='3.9'",
   "sphinx-autobuild==2024.9.19 ; python_version>='3.9'",
   "sphinx-rtd-theme==2.0.0 ; python_version>='3.9'"
 ]