diff --git a/pyproject.toml b/pyproject.toml
index c465b3a5..8aab2fbb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ tests = [
 ]
 doc = [
     "Sphinx==8.1.3",
-    "ansys-sphinx-theme==1.6.3",
+    "ansys-sphinx-theme==1.6.4",
     "sphinx-copybutton==0.5.2",
     "sphinx_design==0.6.1",
     "sphinx_toolbox==4.1.0",