diff --git a/requirements_doc.txt b/requirements_doc.txt
index d33848ed..9a5f05b5 100644
--- a/requirements_doc.txt
+++ b/requirements_doc.txt
@@ -1,5 +1,5 @@
 Sphinx==7.3.7
-sphinx-rtd-theme==2.0.0
+sphinx-rtd-theme==3.1.0
 autodoc_pydantic==2.2.0
 numpy==2.3.4
 pint==0.24.4