diff --git a/tests/test_basic.py b/tests/test_basic.py
index 21a47f6..7aa2573 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -6,5 +6,5 @@
 @pytest.mark.asyncio
 async def test_basic():
     async with Client() as client:
-        audio_query = await client.create_audio_query("こんにちは！", speaker=1)
-        await audio_query.synthesis(speaker=1)
+        audio_query = await client.create_audio_query("こんにちは！", style_id=1)
+        await audio_query.synthesis(style_id=1)
diff --git a/voicevox/audio_query.py b/voicevox/audio_query.py
index a55099f..e836a29 100644
--- a/voicevox/audio_query.py
+++ b/voicevox/audio_query.py
@@ -152,11 +152,11 @@ async def synthesis(
         self,
         *,
         enable_interrogative_upspeak: bool = True,
-        speaker: int,
+        style_id: int,
         core_version: Optional[str] = None,
     ) -> bytes:
         params = {
-            "speaker": speaker,
+            "style_id": style_id,
             "enable_interrogative_upspeak": enable_interrogative_upspeak,
         }
         if core_version is not None:
diff --git a/voicevox/client.py b/voicevox/client.py
index 5f9b739..b3895f0 100644
--- a/voicevox/client.py
+++ b/voicevox/client.py
@@ -52,7 +52,7 @@ async def __aexit__(self, *args) -> None:
         await self.close()
 
     async def create_audio_query(
-        self, text: str, speaker: int, *, core_version: Optional[str] = None
+        self, text: str, style_id: int, *, core_version: Optional[str] = None
     ) -> AudioQuery:
         """Create audio query
 
@@ -72,7 +72,7 @@ async def create_audio_query(
         AudioQuery
             Audio query, that run synthesis.
         """
-        params = {"text": text, "speaker": speaker}
+        params = {"text": text, "style_id": style_id}
         if core_version is not None:
             params["core_version"] = core_version
         audio_query = await self.http.create_audio_query(params)