diff --git a/Cargo.toml b/Cargo.toml
index c0ea8214..a51150d0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "virtio-drivers"
-version = "0.7.4"
+version = "0.7.5"
 license = "MIT"
 authors = [
   "Jiajie Chen <noc@jiegec.ac.cn>",
@@ -8,21 +8,21 @@ authors = [
   "Yuekai Jia <equation618@gmail.com>",
   "Andrew Walbran <qwandor@google.com>",
 ]
-edition = "2018"
+edition = "2021"
 description = "VirtIO guest drivers."
 repository = "https://github.com/rcore-os/virtio-drivers"
 keywords = ["virtio"]
 categories = ["hardware-support", "no-std"]
 
 [dependencies]
-log = "0.4"
-bitflags = "2.3.0"
-enumn = "0.1.13"
-zerocopy = { version = "0.7.5", features = ["derive"] }
+log = "0.4.22"
+bitflags = "2.6.0"
+enumn = "0.1.14"
+zerocopy = { version = "0.7.35", features = ["derive"] }
 
 [features]
 default = ["alloc"]
 alloc = ["zerocopy/alloc"]
 
 [dev-dependencies]
-zerocopy = { version = "0.7.5", features = ["alloc"] }
+zerocopy = { version = "0.7.35", features = ["alloc"] }
diff --git a/examples/aarch64/.cargo/config b/examples/aarch64/.cargo/config.toml
similarity index 100%
rename from examples/aarch64/.cargo/config
rename to examples/aarch64/.cargo/config.toml
diff --git a/examples/riscv/.cargo/config b/examples/riscv/.cargo/config.toml
similarity index 100%
rename from examples/riscv/.cargo/config
rename to examples/riscv/.cargo/config.toml
diff --git a/examples/riscv/Cargo.toml b/examples/riscv/Cargo.toml
index 0d0c9fc7..26d5d313 100644
--- a/examples/riscv/Cargo.toml
+++ b/examples/riscv/Cargo.toml
@@ -2,7 +2,7 @@
 name = "riscv"
 version = "0.1.0"
 authors = ["Runji Wang <wangrunji0408@163.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/examples/riscv/src/main.rs b/examples/riscv/src/main.rs
index 45616293..dc54314e 100644
--- a/examples/riscv/src/main.rs
+++ b/examples/riscv/src/main.rs
@@ -186,7 +186,7 @@ fn virtio_sound<T: Transport>(transport: T) {
     let mut sound =
         VirtIOSound::<HalImpl, T>::new(transport).expect("failed to create sound driver");
     let output_streams = sound.output_streams().unwrap();
-    if output_streams.len() > 0 {
+    if !output_streams.is_empty() {
         let output_stream_id = *output_streams.first().unwrap();
         let rates = sound.rates_supported(output_stream_id).unwrap();
         let formats = sound.formats_supported(output_stream_id).unwrap();
@@ -204,7 +204,7 @@ fn virtio_sound<T: Transport>(transport: T) {
             PcmFormat::U32
         };
         let channel = if channel_range.contains(&2) {
-            2 as u8
+            2
         } else {
             *channel_range.start()
         };
diff --git a/examples/x86_64/.cargo/config b/examples/x86_64/.cargo/config.toml
similarity index 100%
rename from examples/x86_64/.cargo/config
rename to examples/x86_64/.cargo/config.toml
diff --git a/src/device/sound.rs b/src/device/sound.rs
index e8fa1f95..571a55a5 100644
--- a/src/device/sound.rs
+++ b/src/device/sound.rs
@@ -530,14 +530,12 @@ impl<H: Hal, T: Transport> VirtIOSound<H, T> {
                     if self.tx_queue.should_notify() {
                         self.transport.notify(TX_QUEUE_IDX);
                     }
-                    info!("Added buffer, head = {}, token = {}", head, tokens[head]);
                     buffers[head] = Some(buffer);
                     head += 1;
                     if head >= usize::from(QUEUE_SIZE) {
                         head = 0;
                     }
                 } else if head == tail {
-                    info!("head = {head}, tail = {tail}, breaking");
                     break;
                 }
             }
@@ -549,7 +547,6 @@ impl<H: Hal, T: Transport> VirtIOSound<H, T> {
                         &mut [statuses[tail].as_bytes_mut()],
                     )?;
                 }
-                info!("Popped buffer, tail = {}, token = {}", tail, tokens[tail]);
                 if statuses[tail].status != CommandCode::SOk.into() {
                     return Err(Error::IoError);
                 }