diff --git a/specs/openapi.json b/specs/openapi.json
index 86409f1..ee0a7a3 100644
--- a/specs/openapi.json
+++ b/specs/openapi.json
@@ -12950,6 +12950,13 @@
               "null"
             ],
             "contentEncoding": "base64"
+          },
+          "banner": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "contentEncoding": "base64"
           }
         },
         "required": [
diff --git a/specs/openapi_preview.json b/specs/openapi_preview.json
index e806ad0..202ca90 100644
--- a/specs/openapi_preview.json
+++ b/specs/openapi_preview.json
@@ -13165,6 +13165,13 @@
               "null"
             ],
             "contentEncoding": "base64"
+          },
+          "banner": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "contentEncoding": "base64"
           }
         },
         "required": [