diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d55b97c3..42fad1c44 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -128,8 +128,60 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Gemini models. Added foundational example
   `14p-function-calling-gemini-vertex-ai.py`.
 
+- Added support in `OpenAIRealtimeBetaLLMService` for the
+  `conversation.item.input_audio_transcription.delta` server message.
+
+- Added error handling in `OpenAIRealtimeBetaLLMService` for the
+  `response.done` server message reporting a failure.
+
+- Added support in `OpenAIRealtimeBetaLLMService` for the new
+  `gpt-4o-transcribe-latest` input audio transcription model.
+
+- Added support in `OpenAIRealtimeBetaLLMService` for the new
+  `input_audio_noise_reduction` session property.
+
+  ```python
+  session_properties = SessionProperties(
+    # ...
+    input_audio_noise_reduction=InputAudioNoiseReduction(
+      type="near_field" # also supported: "far_field"
+    )
+    # ...
+  )
+  ```
+
+- Added support in `OpenAIRealtimeBetaLLMService` for the new
+  `semantic_vad` `turn_detection` session property, which is a more
+  sophisticated model for detecting when the user has stopped speaking.
+
+- Added `on_conversation_item_created` and `on_conversation_item_updated`
+  events to `OpenAIRealtimeBetaLLMService`.
+
+  ```python
+  @llm.event_handler("on_conversation_item_created")
+  async def on_conversation_item_created(llm, item_id, item):
+    # ...
+
+  @llm.event_handler("on_conversation_item_updated")
+  async def on_conversation_item_updated(llm, item_id, item):
+    # `item` may not always be available here
+    # ...
+  ```
+
+- Added `retrieve_conversation_item(item_id)` to `OpenAIRealtimeBetaLLMService`.
+
+  ```python
+  item = await llm.retrieve_conversation_item(item_id)
+  ```
+
 ### Changed
 
+- Updated the default model for `CartesiaTTSService` and
+  `CartesiaHttpTTSService` to `sonic-2`.
+
+- Updated the default model for `OpenAIRealtimeBetaLLMService` to
+  `gpt-4o-realtime-preview-latest`.
+
 - Function calls are now executed in tasks. This means that the pipeline will
   not be blocked while the function call is being executed.
 
@@ -216,6 +268,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed an issue in `RimeTTSService` where the last line of text sent didn't
   result in an audio output being generated.
 
+- Fixed `OpenAIRealtimeBetaLLMService` by adding support for the
+  `conversation.item.input_audio_transcription.delta` server message, which was
+  added server-side at some point and not handled client-side.
+
 ### Other
 
 - Add foundational example `07w-interruptible-fal.py`, showing `FalSTTService`.