diff --git a/packages/openapi-types/index.ts b/packages/openapi-types/index.ts
index 5bd58b2b..c4d608be 100644
--- a/packages/openapi-types/index.ts
+++ b/packages/openapi-types/index.ts
@@ -142,6 +142,7 @@ export namespace OpenAPIV3_1 {
    */
   export type SchemaObject =
     | ArraySchemaObject
+    | TupleSchemaObject
     | NonArraySchemaObject
     | MixedSchemaObject;
 
@@ -150,6 +151,11 @@ export namespace OpenAPIV3_1 {
     items: ReferenceObject | SchemaObject;
   }
 
+  export interface TupleSchemaObject extends BaseSchemaObject {
+    type: ArraySchemaObjectType;
+    prefixItems: (ReferenceObject | SchemaObject)[];
+  }
+
   export interface NonArraySchemaObject extends BaseSchemaObject {
     type?: NonArraySchemaObjectType;
   }