diff --git a/src/codec/mod.rs b/src/codec/mod.rs
index d6808b5..aaa17ff 100644
--- a/src/codec/mod.rs
+++ b/src/codec/mod.rs
@@ -138,7 +138,7 @@ impl<'r> TryFrom<&'r [u8]> for Request<'r> {
                     return Err(Error::ByteCount(write_count));
                 }
                 let data = Data {
-                    quantity: write_quantity as usize,
+                    quantity: write_quantity,
                     data: &bytes[10..10 + write_count as usize],
                 };
                 ReadWriteMultipleRegisters(read_address, read_quantity, write_address, data)
diff --git a/src/codec/rtu/mod.rs b/src/codec/rtu/mod.rs
index a2e0eac..fa18874 100644
--- a/src/codec/rtu/mod.rs
+++ b/src/codec/rtu/mod.rs
@@ -69,14 +69,13 @@ pub fn decode(
                 Response => "response",
             };
             if drop_cnt + 1 >= MAX_FRAME_LEN {
-                error!(
-                    "Giving up to decode frame after dropping {} byte(s): {:X?}",
-                    drop_cnt,
+                log::error!(
+                    "Giving up to decode frame after dropping {drop_cnt} byte(s): {:X?}",
                     &buf[0..drop_cnt]
                 );
                 return Err(err);
             }
-            warn!("Failed to decode {} frame: {}", pdu_type, err);
+            log::warn!("Failed to decode {pdu_type} frame: {err}");
             drop_cnt += 1;
             retry = true;
             Ok(None)
diff --git a/src/codec/rtu/server.rs b/src/codec/rtu/server.rs
index d3ff541..6a05909 100644
--- a/src/codec/rtu/server.rs
+++ b/src/codec/rtu/server.rs
@@ -15,7 +15,7 @@ pub fn decode_request(buf: &[u8]) -> Result<Option<RequestAdu>> {
                     .map(|pdu| Some(RequestAdu { hdr, pdu }))
                     .map_err(|err| {
                         // Unrecoverable error
-                        error!("Failed to decode request PDU: {}", err);
+                        log::error!("Failed to decode request PDU: {err}");
                         err
                     })
             } else {
diff --git a/src/codec/tcp/mod.rs b/src/codec/tcp/mod.rs
index 92fe7cb..fa2518b 100644
--- a/src/codec/tcp/mod.rs
+++ b/src/codec/tcp/mod.rs
@@ -70,14 +70,13 @@ pub fn decode(
                 Response => "response",
             };
             if drop_cnt + 1 >= MAX_FRAME_LEN {
-                error!(
-                    "Giving up to decode frame after dropping {} byte(s): {:X?}",
-                    drop_cnt,
+                log::error!(
+                    "Giving up to decode frame after dropping {drop_cnt} byte(s): {:X?}",
                     &buf[0..drop_cnt]
                 );
                 return Err(err);
             }
-            warn!("Failed to decode {} frame: {}", pdu_type, err);
+            log::warn!("Failed to decode {pdu_type} frame: {err}");
             drop_cnt += 1;
             retry = true;
             Ok(None)
diff --git a/src/codec/tcp/server.rs b/src/codec/tcp/server.rs
index 1624713..fad9190 100644
--- a/src/codec/tcp/server.rs
+++ b/src/codec/tcp/server.rs
@@ -25,7 +25,7 @@ pub fn decode_request(buf: &[u8]) -> Result<Option<RequestAdu>> {
                 .map(|pdu| Some(RequestAdu { hdr, pdu }))
                 .map_err(|err| {
                     // Unrecoverable error
-                    error!("Failed to decode request PDU: {}", err);
+                    log::error!("Failed to decode request PDU: {err}");
                     err
                 })
         } else {
@@ -62,7 +62,7 @@ pub fn decode_response(buf: &[u8]) -> Result<Option<ResponseAdu>> {
                     .map(|pdu| Some(ResponseAdu { hdr, pdu }))
                     .map_err(|err| {
                         // Unrecoverable error
-                        error!("Failed to decode response PDU: {}", err);
+                        log::error!("Failed to decode response PDU: {err}");
                         err
                     })
             } else {
diff --git a/src/frame/coils.rs b/src/frame/coils.rs
index 0eb289f..b693f77 100644
--- a/src/frame/coils.rs
+++ b/src/frame/coils.rs
@@ -109,7 +109,7 @@ pub fn pack_coils(coils: &[Coil], bytes: &mut [u8]) -> Result<usize, Error> {
     }
     coils.iter().enumerate().for_each(|(i, b)| {
         let v = if *b { 0b1 } else { 0b0 };
-        bytes[(i / 8) as usize] |= v << (i % 8);
+        bytes[i / 8] |= v << (i % 8);
     });
     Ok(packed_size)
 }
@@ -238,8 +238,8 @@ mod tests {
 
     #[test]
     fn convert_coil_to_bool() {
-        assert_eq!(u16_coil_to_bool(0xFF00).unwrap(), true);
-        assert_eq!(u16_coil_to_bool(0x0000).unwrap(), false);
+        assert!(u16_coil_to_bool(0xFF00).unwrap());
+        assert!(!u16_coil_to_bool(0x0000).unwrap());
         assert_eq!(
             u16_coil_to_bool(0x1234).err().unwrap(),
             Error::CoilValue(0x1234)
diff --git a/src/lib.rs b/src/lib.rs
index 85b46a6..9a91f8d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,9 +4,6 @@
 #![doc = include_str!("../README.md")]
 #![no_std]
 
-#[macro_use]
-extern crate log;
-
 mod codec;
 mod error;
 mod frame;