diff --git a/sphinx_design/extension.py b/sphinx_design/extension.py
index 21ec03d..f7d582c 100644
--- a/sphinx_design/extension.py
+++ b/sphinx_design/extension.py
@@ -70,7 +70,7 @@ def update_css_js(app: Sphinx):
     content = read_text(static_module, "style.min.css")
     # Write the css file
     if sphinx_version < (7, 1):
-        hash = hashlib.md5(content.encode("utf8")).hexdigest()
+        hash = hashlib.md5(content.encode("utf8"), usedforsecurity=False).hexdigest()
         css_path = static_path / f"sphinx-design.{hash}.min.css"
     else:
         # since sphinx 7.1 a checksum is added to the css file URL, so there is no need to do it here