diff --git a/pyproject.toml b/pyproject.toml
index 40d9d1fa..0aec20e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ tests = [
     "setuptools==75.1.0",
 ]
 doc = [
-    "Sphinx==8.0.2",
+    "Sphinx==8.1.3",
     "ansys-sphinx-theme==1.1.2",
     "sphinx-copybutton==0.5.2",
     "sphinx_design==0.6.1",