diff --git a/src/types/content.ts b/src/types/content.ts
index d7b8a94d..e509f8a2 100644
--- a/src/types/content.ts
+++ b/src/types/content.ts
@@ -227,6 +227,8 @@ export declare interface GenerationConfig {
    * If set, a compatible responseMimeType must also be set.
    */
   responseSchema?: ResponseSchema;
+  /** Optional. The seed to use for generation. */
+  seed?: number;
 }
 
 /**