diff --git a/crates/voicevox_core/src/engine/synthesis_engine.rs b/crates/voicevox_core/src/engine/synthesis_engine.rs
index 8db50b604..fc91005c4 100644
--- a/crates/voicevox_core/src/engine/synthesis_engine.rs
+++ b/crates/voicevox_core/src/engine/synthesis_engine.rs
@@ -633,12 +633,12 @@ mod tests {
     use ::test_util::OPEN_JTALK_DIC_DIR;
     use pretty_assertions::assert_eq;
 
-    use crate::{infer::runtimes::Onnxruntime, *};
+    use crate::{synthesizer::InferenceRuntimeImpl, *};
 
     #[rstest]
     #[tokio::test]
     async fn is_openjtalk_dict_loaded_works() {
-        let core = InferenceCore::<Onnxruntime>::new(false, 0).unwrap();
+        let core = InferenceCore::<InferenceRuntimeImpl>::new(false, 0).unwrap();
         let synthesis_engine =
             SynthesisEngine::new(core, OpenJtalk::new(OPEN_JTALK_DIC_DIR).unwrap().into());
 
@@ -648,7 +648,7 @@ mod tests {
     #[rstest]
     #[tokio::test]
     async fn create_accent_phrases_works() {
-        let core = InferenceCore::<Onnxruntime>::new(false, 0).unwrap();
+        let core = InferenceCore::<InferenceRuntimeImpl>::new(false, 0).unwrap();
 
         let model = &VoiceModel::sample().await.unwrap();
         core.load_model(model).await.unwrap();
diff --git a/crates/voicevox_core/src/infer.rs b/crates/voicevox_core/src/infer.rs
index 0bc74b6a9..d5a55cfea 100644
--- a/crates/voicevox_core/src/infer.rs
+++ b/crates/voicevox_core/src/infer.rs
@@ -2,7 +2,7 @@ mod model_file;
 pub(crate) mod runtimes;
 pub(crate) mod signatures;
 
-use std::{fmt::Debug, hash::Hash, marker::PhantomData, sync::Arc};
+use std::{fmt::Debug, marker::PhantomData, sync::Arc};
 
 use derive_new::new;
 use enum_map::{Enum, EnumMap};
@@ -11,9 +11,9 @@ use thiserror::Error;
 
 use crate::{ErrorRepr, SupportedDevices};
 
-pub(crate) trait InferenceRuntime: Copy + Ord + Hash + Debug + 'static {
+pub(crate) trait InferenceRuntime: 'static {
     type Session: Session;
-    type RunBuilder<'a>: RunBuilder<'a, Runtime = Self>;
+    type RunBuilder<'a>: RunBuilder<'a, Session = Self::Session>;
     fn supported_devices() -> crate::Result<SupportedDevices>;
 }
 
@@ -24,10 +24,8 @@ pub(crate) trait Session: Sized + Send + 'static {
     ) -> anyhow::Result<Self>;
 }
 
-pub(crate) trait RunBuilder<'a>:
-    From<&'a mut <Self::Runtime as InferenceRuntime>::Session>
-{
-    type Runtime: InferenceRuntime;
+pub(crate) trait RunBuilder<'a>: From<&'a mut Self::Session> {
+    type Session: Session;
     fn input(&mut self, tensor: Array<impl InputScalar, impl Dimension + 'static>) -> &mut Self;
 }
 
@@ -36,7 +34,7 @@ pub(crate) trait InputScalar: LinalgScalar + Debug + sealed::OnnxruntimeInputSca
 impl InputScalar for i64 {}
 impl InputScalar for f32 {}
 
-pub(crate) trait Signature: Sized + Send + Sync + 'static {
+pub(crate) trait Signature: Sized + Send + 'static {
     type Kind: Enum;
     type Output;
     const KIND: Self::Kind;
diff --git a/crates/voicevox_core/src/infer/runtimes/onnxruntime.rs b/crates/voicevox_core/src/infer/runtimes/onnxruntime.rs
index 636efd91a..ebaa2bcda 100644
--- a/crates/voicevox_core/src/infer/runtimes/onnxruntime.rs
+++ b/crates/voicevox_core/src/infer/runtimes/onnxruntime.rs
@@ -107,7 +107,7 @@ impl<'sess> From<&'sess mut AssertSend<onnxruntime::session::Session<'static>>>
 }
 
 impl<'sess> RunBuilder<'sess> for OnnxruntimeInferenceBuilder<'sess> {
-    type Runtime = Onnxruntime;
+    type Session = AssertSend<onnxruntime::session::Session<'static>>;
 
     fn input(&mut self, tensor: Array<impl InputScalar, impl Dimension + 'static>) -> &mut Self {
         self.inputs
diff --git a/crates/voicevox_core/src/status.rs b/crates/voicevox_core/src/status.rs
index 96f5dcc0a..a4cd4ee84 100644
--- a/crates/voicevox_core/src/status.rs
+++ b/crates/voicevox_core/src/status.rs
@@ -224,8 +224,8 @@ impl<R: InferenceRuntime> LoadedModels<R> {
 mod tests {
 
     use super::*;
-    use crate::infer::runtimes::Onnxruntime;
     use crate::macros::tests::assert_debug_fmt_eq;
+    use crate::synthesizer::InferenceRuntimeImpl;
     use pretty_assertions::assert_eq;
 
     #[rstest]
@@ -237,7 +237,7 @@ mod tests {
     #[case(false, 8)]
     #[case(false, 0)]
     fn status_new_works(#[case] use_gpu: bool, #[case] cpu_num_threads: u16) {
-        let status = Status::<Onnxruntime>::new(use_gpu, cpu_num_threads);
+        let status = Status::<InferenceRuntimeImpl>::new(use_gpu, cpu_num_threads);
         assert_eq!(false, status.light_session_options.use_gpu);
         assert_eq!(use_gpu, status.heavy_session_options.use_gpu);
         assert_eq!(
@@ -254,7 +254,7 @@ mod tests {
     #[rstest]
     #[tokio::test]
     async fn status_load_model_works() {
-        let status = Status::<Onnxruntime>::new(false, 0);
+        let status = Status::<InferenceRuntimeImpl>::new(false, 0);
         let result = status.load_model(&open_default_vvm_file().await).await;
         assert_debug_fmt_eq!(Ok(()), result);
         assert_eq!(1, status.loaded_models.lock().unwrap().0.len());
@@ -263,7 +263,7 @@ mod tests {
     #[rstest]
     #[tokio::test]
     async fn status_is_model_loaded_works() {
-        let status = Status::<Onnxruntime>::new(false, 0);
+        let status = Status::<InferenceRuntimeImpl>::new(false, 0);
         let vvm = open_default_vvm_file().await;
         assert!(
             !status.is_loaded_model(vvm.id()),