diff --git a/src/pipecat/services/ultravox.py b/src/pipecat/services/ultravox.py
index a17ee3e85..52a5d05eb 100644
--- a/src/pipecat/services/ultravox.py
+++ b/src/pipecat/services/ultravox.py
@@ -17,25 +17,19 @@ from loguru import logger
 
 from pipecat.frames.frames import (
     AudioRawFrame,
-    LLMFullResponseEndFrame,
-    LLMFullResponseStartFrame,
-    LLMTextFrame,
-    TranscriptionFrame,
-    TextFrame,
-    StartFrame,
-    EndFrame,
     CancelFrame,
     EndFrame,
     ErrorFrame,
     Frame,
+    LLMFullResponseEndFrame,
+    LLMFullResponseStartFrame,
+    LLMTextFrame,
     StartFrame,
-    TranscriptionFrame,
     UserStartedSpeakingFrame,
     UserStoppedSpeakingFrame,
 )
 from pipecat.processors.frame_processor import FrameDirection
 from pipecat.services.ai_services import AIService
-from pipecat.utils.time import time_now_iso8601
 
 try:
     from transformers import AutoTokenizer