diff --git a/specs/openapi.json b/specs/openapi.json
index 7fd972b..335b534 100644
--- a/specs/openapi.json
+++ b/specs/openapi.json
@@ -25888,14 +25888,7 @@
               "null"
             ],
             "items": {
-              "oneOf": [
-                {
-                  "type": "null"
-                },
-                {
-                  "$ref": "#/components/schemas/UpdateThreadTagRequest"
-                }
-              ]
+              "$ref": "#/components/schemas/UpdateThreadTagRequest"
             },
             "maxItems": 20
           }
diff --git a/specs/openapi_preview.json b/specs/openapi_preview.json
index f799d2f..353a787 100644
--- a/specs/openapi_preview.json
+++ b/specs/openapi_preview.json
@@ -26296,14 +26296,7 @@
               "null"
             ],
             "items": {
-              "oneOf": [
-                {
-                  "type": "null"
-                },
-                {
-                  "$ref": "#/components/schemas/UpdateThreadTagRequest"
-                }
-              ]
+              "$ref": "#/components/schemas/UpdateThreadTagRequest"
             },
             "maxItems": 20
           }