diff --git a/crates/voicevox_core/src/voice_model.rs b/crates/voicevox_core/src/voice_model.rs
index e17d862fc..8a86a4399 100644
--- a/crates/voicevox_core/src/voice_model.rs
+++ b/crates/voicevox_core/src/voice_model.rs
@@ -179,7 +179,7 @@ impl VvmEntryReader {
     }
 
     async fn read_vvm_entry(&self, filename: &str) -> LoadModelResult<Vec<u8>> {
-        (|| async {
+        async {
             let me = self
                 .entry_map
                 .get(filename)
@@ -190,7 +190,7 @@ impl VvmEntryReader {
                 .read_to_end_checked(&mut buf, &me.entry)
                 .await?;
             Ok::<_, anyhow::Error>(buf)
-        })()
+        }
         .await
         .map_err(|source| LoadModelError {
             path: self.reader.path().to_owned(),
diff --git a/crates/voicevox_core_c_api/src/compatible_engine.rs b/crates/voicevox_core_c_api/src/compatible_engine.rs
index 92d007e94..64470c7bf 100644
--- a/crates/voicevox_core_c_api/src/compatible_engine.rs
+++ b/crates/voicevox_core_c_api/src/compatible_engine.rs
@@ -68,7 +68,7 @@ fn set_message(message: &str) {
 
 #[no_mangle]
 pub extern "C" fn initialize(use_gpu: bool, cpu_num_threads: c_int, load_all_models: bool) -> bool {
-    let result = RUNTIME.block_on((|| async {
+    let result = RUNTIME.block_on(async {
         let synthesizer = voicevox_core::Synthesizer::new_with_initialize(
             Arc::new(OpenJtalk::new_without_dic()),
             &voicevox_core::InitializeOptions {
@@ -89,7 +89,7 @@ pub extern "C" fn initialize(use_gpu: bool, cpu_num_threads: c_int, load_all_mod
         }
 
         Ok::<_, voicevox_core::Error>(synthesizer)
-    })());
+    });
 
     match result {
         Ok(synthesizer) => {
diff --git a/crates/voicevox_core_python_api/src/lib.rs b/crates/voicevox_core_python_api/src/lib.rs
index 42d3feaeb..adabd09ae 100644
--- a/crates/voicevox_core_python_api/src/lib.rs
+++ b/crates/voicevox_core_python_api/src/lib.rs
@@ -283,7 +283,7 @@ impl Synthesizer {
                         .iter()
                         .map(|ap| to_pydantic_dataclass(ap, class))
                         .collect::<PyResult<Vec<_>>>();
-                    let list = PyList::new(py, accent_phrases.into_iter());
+                    let list = PyList::new(py, accent_phrases);
                     Ok(list.to_object(py))
                 })
             },
@@ -314,7 +314,7 @@ impl Synthesizer {
                         .iter()
                         .map(|ap| to_pydantic_dataclass(ap, class))
                         .collect::<PyResult<Vec<_>>>();
-                    let list = PyList::new(py, accent_phrases.into_iter());
+                    let list = PyList::new(py, accent_phrases);
                     Ok(list.to_object(py))
                 })
             },
diff --git a/rust-toolchain b/rust-toolchain
index 68bc7ff2a..5e3a42566 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.71.1
+1.73.0