diff --git a/.fern/metadata.json b/.fern/metadata.json
index 764f419..a2b4d2c 100644
--- a/.fern/metadata.json
+++ b/.fern/metadata.json
@@ -14,5 +14,5 @@
     },
     "exclude_types_from_init_exports": true
   },
-  "originGitCommit": "9b9b2fa1161d85c0e7da5c783a8bc4e2b4dae7c0"
+  "originGitCommit": "0073fa0ae670f77e4987407b8cca1cf179d5f90b"
 }
\ No newline at end of file
diff --git a/.fern/replay.lock b/.fern/replay.lock
index 8103718..82f3c76 100644
--- a/.fern/replay.lock
+++ b/.fern/replay.lock
@@ -78,7 +78,13 @@ generations:
     cli_version: unknown
     generator_versions:
       fernapi/fern-python-sdk: 4.37.0
-current_generation: 88a3914f38e882be10f7a0a6cba18e6f5ec98259
+  - commit_sha: b1f9cb3bf3fd8da2262807fd603dee3741187918
+    tree_hash: e378b36a4bb43fd42f28703a58814ae759fe9434
+    timestamp: 2026-10-09T14:05:05.278Z
+    cli_version: unknown
+    generator_versions:
+      fernapi/fern-python-sdk: 4.37.0
+current_generation: b1f9cb3bf3fd8da2262807fd603dee3741187918
 forgotten_hashes:
   - sha256:19124603cb0683406e750ffda0725786727208c0f7ddb481c256a0990b2c5585
 patches:
@@ -87,7 +93,7 @@ patches:
     original_commit: 13d8e0683ffa08bcfc9a381eb9604adf5abdbe0b
     original_message: "chore: ignore local venv and planning docs"
     original_author: plutoless <qianze.zhang@hotmail.com>
-    base_generation: 88a3914f38e882be10f7a0a6cba18e6f5ec98259
+    base_generation: b1f9cb3bf3fd8da2262807fd603dee3741187918
     files:
       - .gitignore
     patch_content: |
@@ -116,7 +122,7 @@ patches:
     original_commit: a065088b4c45e2ca7e1bb91b1a899b8444800121
     original_message: "fix(vendors): send Speechmatics STT key instead of api_key"
     original_author: digitallysavvy <hermes.frangoudis@gmail.com>
-    base_generation: 88a3914f38e882be10f7a0a6cba18e6f5ec98259
+    base_generation: b1f9cb3bf3fd8da2262807fd603dee3741187918
     files:
       - src/agora_agent/types/speechmatics_asr_params.py
     patch_content: |
@@ -259,7 +265,7 @@ patches:
     original_commit: 33a436b3bdb6f2a6fe4d8987b6536c2f0ac2862e
     original_message: "fix: address v2.8.0 release review findings"
     original_author: digitallysavvy <hermes.frangoudis@gmail.com>
-    base_generation: 88a3914f38e882be10f7a0a6cba18e6f5ec98259
+    base_generation: b1f9cb3bf3fd8da2262807fd603dee3741187918
     files:
       - src/agora_agent/agents/types/start_agents_request_properties_advanced_features.py
     patch_content: |
diff --git a/src/agora_agent/types/gemini_tts_params.py b/src/agora_agent/types/gemini_tts_params.py
index 3e59506..70983fb 100644
--- a/src/agora_agent/types/gemini_tts_params.py
+++ b/src/agora_agent/types/gemini_tts_params.py
@@ -27,7 +27,7 @@ class GeminiTtsParams(UncheckedBaseModel):
     Gemini voice name.
     """
 
-    style: str = pydantic.Field()
+    style: typing.Optional[str] = pydantic.Field(default=None)
     """
     Style instruction for the generated speech.
     """