diff --git a/fastapi/openapi/docs.py b/fastapi/openapi/docs.py
index 1be90d188..d6af17a85 100644
--- a/fastapi/openapi/docs.py
+++ b/fastapi/openapi/docs.py
@@ -17,8 +17,8 @@ def get_swagger_ui_html(
     *,
     openapi_url: str,
     title: str,
-    swagger_js_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@3/swagger-ui-bundle.js",
-    swagger_css_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@3/swagger-ui.css",
+    swagger_js_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@4/swagger-ui-bundle.js",
+    swagger_css_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@4/swagger-ui.css",
     swagger_favicon_url: str = "https://fastapi.tiangolo.com/img/favicon.png",
     oauth2_redirect_url: Optional[str] = None,
     init_oauth: Optional[Dict[str, Any]] = None,