diff --git a/crates/voicevox_core/src/devices.rs b/crates/voicevox_core/src/devices.rs
index 0890c0cff..fa7710c80 100644
--- a/crates/voicevox_core/src/devices.rs
+++ b/crates/voicevox_core/src/devices.rs
@@ -230,10 +230,6 @@ mod tests {
                     reason = "比較対象としてここは網羅されてなければなりません"
                 )]
                 let SupportedDevices { cpu: _, cuda, dml } = &SUPPORTED_DEVICES;
-                #[expect(
-                    clippy::borrow_deref_ref,
-                    reason = "多分raw記法自体にまだ対応していない"
-                )]
                 [&raw const *cuda, &raw const *dml]
             },
             *GpuSpec::defaults()
diff --git a/crates/voicevox_core/src/engine/model.rs b/crates/voicevox_core/src/engine/model.rs
index 228c0bbd8..4c7d5c8f8 100644
--- a/crates/voicevox_core/src/engine/model.rs
+++ b/crates/voicevox_core/src/engine/model.rs
@@ -99,7 +99,7 @@ where
 
     struct Visitor;
 
-    impl<'de> de::Visitor<'de> for Visitor {
+    impl de::Visitor<'_> for Visitor {
         type Value = ();
 
         fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -140,7 +140,7 @@ where
 
     struct Visitor;
 
-    impl<'de> de::Visitor<'de> for Visitor {
+    impl de::Visitor<'_> for Visitor {
         type Value = ();
 
         fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
diff --git a/crates/voicevox_core/src/manifest.rs b/crates/voicevox_core/src/manifest.rs
index 8a8290887..0b1a005cd 100644
--- a/crates/voicevox_core/src/manifest.rs
+++ b/crates/voicevox_core/src/manifest.rs
@@ -28,7 +28,7 @@ impl<'de> Deserialize<'de> for FormatVersionV1 {
 
         struct Visitor;
 
-        impl<'de> de::Visitor<'de> for Visitor {
+        impl de::Visitor<'_> for Visitor {
             type Value = FormatVersionV1;
 
             fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
diff --git a/crates/voicevox_core_c_api/src/c_impls.rs b/crates/voicevox_core_c_api/src/c_impls.rs
index c83d9b3b0..bc1d89c3c 100644
--- a/crates/voicevox_core_c_api/src/c_impls.rs
+++ b/crates/voicevox_core_c_api/src/c_impls.rs
@@ -25,14 +25,12 @@ use crate::{
 
 impl VoicevoxOnnxruntime {
     #[cfg(feature = "load-onnxruntime")]
-    pub(crate) fn lib_versioned_filename() -> &'static std::ffi::CStr {
-        to_cstr!(voicevox_core::blocking::Onnxruntime::LIB_VERSIONED_FILENAME)
-    }
+    pub(crate) const LIB_VERSIONED_FILENAME: &'static std::ffi::CStr =
+        to_cstr!(voicevox_core::blocking::Onnxruntime::LIB_VERSIONED_FILENAME);
 
     #[cfg(feature = "load-onnxruntime")]
-    pub(crate) fn lib_unversioned_filename() -> &'static std::ffi::CStr {
-        to_cstr!(voicevox_core::blocking::Onnxruntime::LIB_UNVERSIONED_FILENAME)
-    }
+    pub(crate) const LIB_UNVERSIONED_FILENAME: &'static std::ffi::CStr =
+        to_cstr!(voicevox_core::blocking::Onnxruntime::LIB_UNVERSIONED_FILENAME);
 
     #[ref_cast_custom]
     fn new(rust: &voicevox_core::blocking::Onnxruntime) -> &Self;
@@ -61,11 +59,11 @@ impl VoicevoxOnnxruntime {
 #[cfg(feature = "load-onnxruntime")]
 macro_rules! to_cstr {
     ($s:expr) => {{
-        const __RUST_STR: &str = $s;
-        static __C_STR: &[u8] = const_format::concatcp!(__RUST_STR, '\0').as_bytes();
-
-        std::ffi::CStr::from_bytes_with_nul(__C_STR)
-            .unwrap_or_else(|e| panic!("{__RUST_STR:?} should not contain `\\0`: {e}"))
+        static CSTR: &[u8] = const_format::concatcp!($s, '\0').as_bytes();
+        unsafe {
+            // SAFETY: added a nul with `concatcp!`
+            std::ffi::CStr::from_bytes_with_nul_unchecked(CSTR)
+        }
     }};
 }
 #[cfg(feature = "load-onnxruntime")]
diff --git a/crates/voicevox_core_c_api/src/drop_check.rs b/crates/voicevox_core_c_api/src/drop_check.rs
index 2dd85f3f3..92fdd5ec0 100644
--- a/crates/voicevox_core_c_api/src/drop_check.rs
+++ b/crates/voicevox_core_c_api/src/drop_check.rs
@@ -126,7 +126,7 @@ mod tests {
     )]
     fn it_denies_unknown_char_ptr() {
         let checker = CStringDropChecker::new();
-        let s = CStr::from_bytes_with_nul(b"\0").unwrap().to_owned();
+        let s = c"".to_owned();
         checker.check(s.into_raw());
     }
 
@@ -139,6 +139,6 @@ mod tests {
         checker.blacklist(STATIC);
         checker.check(STATIC.as_ptr() as *mut c_char);
 
-        static STATIC: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
+        static STATIC: &CStr = c"";
     }
 }
diff --git a/crates/voicevox_core_c_api/src/lib.rs b/crates/voicevox_core_c_api/src/lib.rs
index 7efb1e9e3..3f1ab4897 100644
--- a/crates/voicevox_core_c_api/src/lib.rs
+++ b/crates/voicevox_core_c_api/src/lib.rs
@@ -104,8 +104,8 @@ fn init_logger_once() {
 #[no_mangle]
 pub extern "C" fn voicevox_get_onnxruntime_lib_versioned_filename() -> *const c_char {
     init_logger_once();
-    let filename = VoicevoxOnnxruntime::lib_versioned_filename();
-    C_STRING_DROP_CHECKER.blacklist(filename).as_ptr()
+    const FILENAME: &CStr = VoicevoxOnnxruntime::LIB_VERSIONED_FILENAME;
+    C_STRING_DROP_CHECKER.blacklist(FILENAME).as_ptr()
 }
 
 // TODO: cbindgenが`#[unsafe(no_mangle)]`に対応したら`#[no_mangle]`を置き換える
@@ -119,8 +119,8 @@ pub extern "C" fn voicevox_get_onnxruntime_lib_versioned_filename() -> *const c_
 #[no_mangle]
 pub extern "C" fn voicevox_get_onnxruntime_lib_unversioned_filename() -> *const c_char {
     init_logger_once();
-    let filename = VoicevoxOnnxruntime::lib_unversioned_filename();
-    C_STRING_DROP_CHECKER.blacklist(filename).as_ptr()
+    const FILENAME: &CStr = VoicevoxOnnxruntime::LIB_UNVERSIONED_FILENAME;
+    C_STRING_DROP_CHECKER.blacklist(FILENAME).as_ptr()
 }
 
 /// ::voicevox_onnxruntime_load_once のオプション。
@@ -151,7 +151,7 @@ pub struct VoicevoxLoadOnnxruntimeOptions {
 pub extern "C" fn voicevox_make_default_load_onnxruntime_options() -> VoicevoxLoadOnnxruntimeOptions
 {
     init_logger_once();
-    let filename = VoicevoxOnnxruntime::lib_versioned_filename();
+    let filename = VoicevoxOnnxruntime::LIB_VERSIONED_FILENAME;
     let filename = C_STRING_DROP_CHECKER.blacklist(filename).as_ptr();
     VoicevoxLoadOnnxruntimeOptions { filename }
 }
diff --git a/crates/voicevox_core_c_api/src/object.rs b/crates/voicevox_core_c_api/src/object.rs
index ce5298a9a..5cd6aa3df 100644
--- a/crates/voicevox_core_c_api/src/object.rs
+++ b/crates/voicevox_core_c_api/src/object.rs
@@ -1,3 +1,9 @@
+#![expect(
+    clippy::type_complexity,
+    reason = "`CApiObject::bodies`に対するもの。型を分離するとかえって可読性を失う。その代わりコメ\
+              ントを入れている。`#[…]`じゃなくて`#![…]`でやってるのは、Clippy 0.1.83でeasy-extに反\
+              応するようになってしまったため"
+)]
 use std::{
     any,
     collections::{HashMap, HashSet},
@@ -40,10 +46,6 @@ pub(crate) trait CApiObject: Default + Debug + 'static {
 
     fn heads() -> &'static boxcar::Vec<Self>;
 
-    #[expect(
-        clippy::type_complexity,
-        reason = "型を分離するとかえって可読性を失う。その代わりコメントを入れている"
-    )]
     fn bodies() -> &'static std::sync::Mutex<
         HashMap<
             NonZero<usize>, // `heads`の要素へのポインタのアドレス
diff --git a/crates/voicevox_core_c_api/tests/e2e/testcases/user_dict_manipulate.rs b/crates/voicevox_core_c_api/tests/e2e/testcases/user_dict_manipulate.rs
index 313b00125..14245444f 100644
--- a/crates/voicevox_core_c_api/tests/e2e/testcases/user_dict_manipulate.rs
+++ b/crates/voicevox_core_c_api/tests/e2e/testcases/user_dict_manipulate.rs
@@ -47,13 +47,7 @@ impl assert_cdylib::TestCase for TestCase {
 
         let add_word = |dict: *const VoicevoxUserDict, word: &VoicevoxUserDictWord| -> Uuid {
             let mut word_uuid = [0u8; 16];
-
-            #[expect(
-                clippy::borrow_deref_ref,
-                reason = "多分raw記法自体にまだ対応していない"
-            )]
             assert_ok(lib.voicevox_user_dict_add_word(dict, &raw const *word, &mut word_uuid));
-
             Uuid::from_slice(&word_uuid).expect("invalid uuid")
         };
 
diff --git a/crates/voicevox_core_python_api/src/lib.rs b/crates/voicevox_core_python_api/src/lib.rs
index d0233c5e7..4873d7ccf 100644
--- a/crates/voicevox_core_python_api/src/lib.rs
+++ b/crates/voicevox_core_python_api/src/lib.rs
@@ -1,3 +1,8 @@
+#![expect(
+    non_local_definitions,
+    reason = "PyO3を≧0.21.0にすることで解決する予定"
+)]
+
 use std::{
     marker::PhantomData,
     mem,
@@ -202,7 +207,10 @@ trait RwLock: From<Self::Item> {
 
 impl<T> RwLock for std::sync::RwLock<T> {
     type Item = T;
-    type RwLockWriteGuard<'a> = std::sync::RwLockWriteGuard<'a, Self::Item> where Self: 'a;
+    type RwLockWriteGuard<'a>
+        = std::sync::RwLockWriteGuard<'a, Self::Item>
+    where
+        Self: 'a;
 
     fn try_read_(&self) -> Result<impl Deref<Target = Self::Item>, ()> {
         self.try_read().map_err(|e| match e {
@@ -229,7 +237,10 @@ impl<T> RwLock for std::sync::RwLock<T> {
 
 impl<T> RwLock for tokio::sync::RwLock<T> {
     type Item = T;
-    type RwLockWriteGuard<'a> = tokio::sync::RwLockWriteGuard<'a, Self::Item> where Self: 'a;
+    type RwLockWriteGuard<'a>
+        = tokio::sync::RwLockWriteGuard<'a, Self::Item>
+    where
+        Self: 'a;
 
     fn try_read_(&self) -> Result<impl Deref<Target = Self::Item>, ()> {
         self.try_read().map_err(|_| ())
diff --git a/rust-toolchain b/rust-toolchain
index 71fae54fb..6b4de0a42 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.82.0
+1.83.0