diff --git a/Cargo.toml b/Cargo.toml
index 2c73a64f6e..39a24a8530 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -116,7 +116,6 @@ restriction = { level = "warn", priority = -2 }
 arithmetic_side_effects = "allow" # TODO: consider
 as_conversions = "allow" # TODO: tricky
 borrow_as_ptr = "allow"
-cast_lossless = "allow" # TODO: easy fix
 cast_possible_truncation = "allow" # TODO: consider
 cast_precision_loss = "allow" # TODO: consider
 checked_conversions = "allow"
diff --git a/src/common/date.rs b/src/common/date.rs
index 59837cd60e..cda4b5da4e 100644
--- a/src/common/date.rs
+++ b/src/common/date.rs
@@ -74,7 +74,7 @@ impl CachedDate {
             .subsec_nanos();
 
         self.render(now);
-        self.next_update = now + Duration::new(1, 0) - Duration::from_nanos(nanos as u64);
+        self.next_update = now + Duration::new(1, 0) - Duration::from_nanos(u64::from(nanos));
     }
 
     fn render(&mut self, now: SystemTime) {
diff --git a/src/headers.rs b/src/headers.rs
index 8bebdb9bfa..ff1f1961bb 100644
--- a/src/headers.rs
+++ b/src/headers.rs
@@ -84,7 +84,7 @@ fn from_digits(bytes: &[u8]) -> Option<u64> {
         match b {
             b'0'..=b'9' => {
                 result = result.checked_mul(RADIX)?;
-                result = result.checked_add((b - b'0') as u64)?;
+                result = result.checked_add(u64::from(b - b'0'))?;
             }
             _ => {
                 // not a DIGIT, get outta here!
diff --git a/src/proto/h1/decode.rs b/src/proto/h1/decode.rs
index a7dd78837a..47cf249687 100644
--- a/src/proto/h1/decode.rs
+++ b/src/proto/h1/decode.rs
@@ -357,15 +357,15 @@ impl ChunkedState {
         match byte!(rdr, cx) {
             b @ b'0'..=b'9' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b - b'0') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b - b'0')));
             }
             b @ b'a'..=b'f' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b + 10 - b'a') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b + 10 - b'a')));
             }
             b @ b'A'..=b'F' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b + 10 - b'A') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b + 10 - b'A')));
             }
             _ => {
                 return Poll::Ready(Err(io::Error::new(
@@ -389,15 +389,15 @@ impl ChunkedState {
         match byte!(rdr, cx) {
             b @ b'0'..=b'9' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b - b'0') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b - b'0')));
             }
             b @ b'a'..=b'f' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b + 10 - b'a') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b + 10 - b'a')));
             }
             b @ b'A'..=b'F' => {
                 *size = or_overflow!(size.checked_mul(radix));
-                *size = or_overflow!(size.checked_add((b + 10 - b'A') as u64));
+                *size = or_overflow!(size.checked_add(u64::from(b + 10 - b'A')));
             }
             b'\t' | b' ' => return Poll::Ready(Ok(ChunkedState::SizeLws)),
             b';' => return Poll::Ready(Ok(ChunkedState::Extension)),
diff --git a/src/proto/h2/ping.rs b/src/proto/h2/ping.rs
index 5c77778da0..f4caae148e 100644
--- a/src/proto/h2/ping.rs
+++ b/src/proto/h2/ping.rs
@@ -423,7 +423,7 @@ impl Bdp {
 fn seconds(dur: Duration) -> f64 {
     const NANOS_PER_SEC: f64 = 1_000_000_000.0;
     let secs = dur.as_secs() as f64;
-    secs + (dur.subsec_nanos() as f64) / NANOS_PER_SEC
+    secs + (f64::from(dur.subsec_nanos())) / NANOS_PER_SEC
 }
 
 // ===== impl KeepAlive =====