diff --git a/vertexai/_genai/types/common.py b/vertexai/_genai/types/common.py
index 277e5e67f1..6fa21c2535 100644
--- a/vertexai/_genai/types/common.py
+++ b/vertexai/_genai/types/common.py
@@ -11394,6 +11394,12 @@ class EventMetadata(_common.BaseModel):
         default=None,
         description="""Optional. Indicates whether the response from the model is complete. Only used for streaming mode.""",
     )
+    input_transcription: Optional[genai_types.Transcription] = Field(
+        default=None, description="""Optional. Audio transcription of user input."""
+    )
+    output_transcription: Optional[genai_types.Transcription] = Field(
+        default=None, description="""Optional. Audio transcription of model output."""
+    )
 
 
 class EventMetadataDict(TypedDict, total=False):
@@ -11420,6 +11426,12 @@ class EventMetadataDict(TypedDict, total=False):
     turn_complete: Optional[bool]
     """Optional. Indicates whether the response from the model is complete. Only used for streaming mode."""
 
+    input_transcription: Optional[genai_types.TranscriptionDict]
+    """Optional. Audio transcription of user input."""
+
+    output_transcription: Optional[genai_types.TranscriptionDict]
+    """Optional. Audio transcription of model output."""
+
 
 EventMetadataOrDict = Union[EventMetadata, EventMetadataDict]