diff --git a/nyanpasu_ipc/src/api/mod.rs b/nyanpasu_ipc/src/api/mod.rs
index c245620..a2061ca 100644
--- a/nyanpasu_ipc/src/api/mod.rs
+++ b/nyanpasu_ipc/src/api/mod.rs
@@ -41,7 +41,7 @@ pub struct R<'a, T: Serialize + DeserializeOwned + Debug> {
     pub ts: i64,
 }
 
-impl<'a, T: Serialize + DeserializeOwned + Debug> R<'a, T> {
+impl<T: Serialize + DeserializeOwned + Debug> R<'_, T> {
     pub fn ok(self) -> Result<Self, IoError> {
         if self.code == ResponseCode::Ok {
             Ok(self)
diff --git a/nyanpasu_service/src/cmds/rpc/mod.rs b/nyanpasu_service/src/cmds/rpc/mod.rs
index ed2f0f9..24e9862 100644
--- a/nyanpasu_service/src/cmds/rpc/mod.rs
+++ b/nyanpasu_service/src/cmds/rpc/mod.rs
@@ -84,7 +84,7 @@ pub async fn rpc(commands: RpcCommand) -> Result<(), crate::cmds::CommandError>
                 .set_dns(&NetworkSetDnsReq {
                     dns_servers: dns_servers
                         .as_ref()
-                        .map(|v| v.into_iter().map(|v| Cow::Borrowed(v)).collect()),
+                        .map(|v| v.iter().map(Cow::Borrowed).collect()),
                 })
                 .await
                 .map_err(|e| crate::cmds::CommandError::Other(e.into()))?;
diff --git a/nyanpasu_service/src/server/instance.rs b/nyanpasu_service/src/server/instance.rs
index 9ff2cac..fa82460 100644
--- a/nyanpasu_service/src/server/instance.rs
+++ b/nyanpasu_service/src/server/instance.rs
@@ -1,6 +1,6 @@
 use nyanpasu_ipc::{api::status::CoreState, utils::get_current_ts};
 use nyanpasu_utils::core::{
-    instance::{self, CoreInstance, CoreInstanceBuilder},
+    instance::{CoreInstance, CoreInstanceBuilder},
     CommandEvent, CoreType,
 };
 use parking_lot::Mutex;
diff --git a/nyanpasu_service/src/server/logger.rs b/nyanpasu_service/src/server/logger.rs
index 1b096c7..bd3d129 100644
--- a/nyanpasu_service/src/server/logger.rs
+++ b/nyanpasu_service/src/server/logger.rs
@@ -42,7 +42,7 @@ impl<'n> Logger<'n> {
     }
 }
 
-impl<'a> std::io::Write for Logger<'a> {
+impl std::io::Write for Logger<'_> {
     fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
         let mut buffer = self.buffer.lock();
         let msg = String::from_utf8_lossy(buf);