diff --git a/pyproject.toml b/pyproject.toml
index f1f80f9d8e7..2b6632b9a5d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ tests = [
 ]
 doc = [
     "ansys-sphinx-theme==1.4.0", # latest is 1.5.3
-    "sphinx==7.4.0", # latest is 8.2.3
+    "sphinx==8.1.3", # latest is 8.2.3
 ]
 
 [tool.setuptools.dynamic]