diff --git a/litellm/types/llms/vertex_ai.py b/litellm/types/llms/vertex_ai.py
index f1f7ac2c6619..6064ba515b57 100644
--- a/litellm/types/llms/vertex_ai.py
+++ b/litellm/types/llms/vertex_ai.py
@@ -206,6 +206,7 @@ class GenerationConfig(TypedDict, total=False):
     responseLogprobs: bool
     logprobs: int
     responseModalities: List[GeminiResponseModalities]
+    speechConfig: SpeechConfig
     thinkingConfig: GeminiThinkingConfig