diff --git a/src/types/generate_content.rs b/src/types/generate_content.rs
index 3541597..ebfa1d6 100644
--- a/src/types/generate_content.rs
+++ b/src/types/generate_content.rs
@@ -38,6 +38,7 @@ pub struct GenerationConfig {
     pub top_k: Option<i32>,
     pub stop_sequences: Option<Vec<String>>,
     pub candidate_count: Option<u32>,
+    pub response_mime_type: Option<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]