diff --git a/src/header/map.rs b/src/header/map.rs
index af6b623b..24b307dc 100644
--- a/src/header/map.rs
+++ b/src/header/map.rs
@@ -1497,7 +1497,7 @@ impl<T> HeaderMap<T> {
     #[inline]
     fn find<K>(&self, key: &K) -> Option<(usize, usize)>
     where
-        K: Hash + Into<HeaderName> + ?Sized,
+        K: Hash + Into<HeaderName>,
         HeaderName: PartialEq<K>,
     {
         if self.entries.is_empty() {
@@ -3758,7 +3758,7 @@ mod into_header_name {
 
     impl IntoHeaderName for HeaderName {}
 
-    impl<'a> Sealed for &'a HeaderName {
+    impl Sealed for &HeaderName {
         #[inline]
         fn try_insert<T>(
             self,
@@ -3778,7 +3778,7 @@ mod into_header_name {
         }
     }
 
-    impl<'a> IntoHeaderName for &'a HeaderName {}
+    impl IntoHeaderName for &HeaderName {}
 
     impl Sealed for &'static str {
         #[inline]
@@ -3868,7 +3868,7 @@ mod as_header_name {
 
     impl AsHeaderName for HeaderName {}
 
-    impl<'a> Sealed for &'a HeaderName {
+    impl Sealed for &HeaderName {
         #[inline]
         fn try_entry<T>(self, map: &mut HeaderMap<T>) -> Result<Entry<'_, T>, TryEntryError> {
             Ok(map.try_entry2(self)?)
@@ -3884,9 +3884,9 @@ mod as_header_name {
         }
     }
 
-    impl<'a> AsHeaderName for &'a HeaderName {}
+    impl AsHeaderName for &HeaderName {}
 
-    impl<'a> Sealed for &'a str {
+    impl Sealed for &str {
         #[inline]
         fn try_entry<T>(self, map: &mut HeaderMap<T>) -> Result<Entry<'_, T>, TryEntryError> {
             Ok(HdrName::from_bytes(self.as_bytes(), move |hdr| {
@@ -3904,7 +3904,7 @@ mod as_header_name {
         }
     }
 
-    impl<'a> AsHeaderName for &'a str {}
+    impl AsHeaderName for &str {}
 
     impl Sealed for String {
         #[inline]
@@ -3924,7 +3924,7 @@ mod as_header_name {
 
     impl AsHeaderName for String {}
 
-    impl<'a> Sealed for &'a String {
+    impl Sealed for &String {
         #[inline]
         fn try_entry<T>(self, map: &mut HeaderMap<T>) -> Result<Entry<'_, T>, TryEntryError> {
             self.as_str().try_entry(map)
@@ -3940,7 +3940,7 @@ mod as_header_name {
         }
     }
 
-    impl<'a> AsHeaderName for &'a String {}
+    impl AsHeaderName for &String {}
 }
 
 #[test]
diff --git a/src/header/name.rs b/src/header/name.rs
index 1b4a39d6..f2436e45 100644
--- a/src/header/name.rs
+++ b/src/header/name.rs
@@ -1412,7 +1412,7 @@ impl<'a> PartialEq<&'a HeaderName> for HeaderName {
     }
 }
 
-impl<'a> PartialEq<HeaderName> for &'a HeaderName {
+impl PartialEq<HeaderName> for &HeaderName {
     #[inline]
     fn eq(&self, other: &HeaderName) -> bool {
         *other == *self
@@ -1466,7 +1466,7 @@ impl<'a> PartialEq<&'a str> for HeaderName {
     }
 }
 
-impl<'a> PartialEq<HeaderName> for &'a str {
+impl PartialEq<HeaderName> for &str {
     /// Performs a case-insensitive comparison of the string against the header
     /// name
     #[inline]
diff --git a/src/header/value.rs b/src/header/value.rs
index 48308cb4..9e751a6a 100644
--- a/src/header/value.rs
+++ b/src/header/value.rs
@@ -411,7 +411,7 @@ macro_rules! from_integers {
             let val = HeaderValue::from(n);
             assert_eq!(val, &n.to_string());
 
-            let n = ::std::$t::MAX;
+            let n = $t::MAX;
             let val = HeaderValue::from(n);
             assert_eq!(val, &n.to_string());
         }
@@ -543,7 +543,7 @@ mod try_from_header_name_tests {
     #[test]
     fn it_converts_using_try_from() {
         assert_eq!(
-            HeaderValue::try_from(name::UPGRADE).unwrap(),
+            HeaderValue::from(name::UPGRADE),
             HeaderValue::from_bytes(b"upgrade").unwrap()
         );
     }
@@ -697,14 +697,14 @@ impl PartialOrd<HeaderValue> for String {
     }
 }
 
-impl<'a> PartialEq<HeaderValue> for &'a HeaderValue {
+impl PartialEq<HeaderValue> for &HeaderValue {
     #[inline]
     fn eq(&self, other: &HeaderValue) -> bool {
         **self == *other
     }
 }
 
-impl<'a> PartialOrd<HeaderValue> for &'a HeaderValue {
+impl PartialOrd<HeaderValue> for &HeaderValue {
     #[inline]
     fn partial_cmp(&self, other: &HeaderValue) -> Option<cmp::Ordering> {
         (**self).partial_cmp(other)
@@ -731,14 +731,14 @@ where
     }
 }
 
-impl<'a> PartialEq<HeaderValue> for &'a str {
+impl PartialEq<HeaderValue> for &str {
     #[inline]
     fn eq(&self, other: &HeaderValue) -> bool {
         *other == *self
     }
 }
 
-impl<'a> PartialOrd<HeaderValue> for &'a str {
+impl PartialOrd<HeaderValue> for &str {
     #[inline]
     fn partial_cmp(&self, other: &HeaderValue) -> Option<cmp::Ordering> {
         self.as_bytes().partial_cmp(other.as_bytes())
diff --git a/src/method.rs b/src/method.rs
index 7b4584ab..2567b739 100644
--- a/src/method.rs
+++ b/src/method.rs
@@ -194,7 +194,7 @@ impl<'a> PartialEq<&'a Method> for Method {
     }
 }
 
-impl<'a> PartialEq<Method> for &'a Method {
+impl PartialEq<Method> for &Method {
     #[inline]
     fn eq(&self, other: &Method) -> bool {
         *self == other
@@ -222,7 +222,7 @@ impl<'a> PartialEq<&'a str> for Method {
     }
 }
 
-impl<'a> PartialEq<Method> for &'a str {
+impl PartialEq<Method> for &str {
     #[inline]
     fn eq(&self, other: &Method) -> bool {
         *self == other.as_ref()
diff --git a/src/uri/authority.rs b/src/uri/authority.rs
index 67754e45..4ca07e23 100644
--- a/src/uri/authority.rs
+++ b/src/uri/authority.rs
@@ -244,7 +244,7 @@ impl PartialEq<Authority> for str {
     }
 }
 
-impl<'a> PartialEq<Authority> for &'a str {
+impl PartialEq<Authority> for &str {
     fn eq(&self, other: &Authority) -> bool {
         self.eq_ignore_ascii_case(other.as_str())
     }
@@ -302,7 +302,7 @@ impl PartialOrd<Authority> for str {
     }
 }
 
-impl<'a> PartialOrd<Authority> for &'a str {
+impl PartialOrd<Authority> for &str {
     fn partial_cmp(&self, other: &Authority) -> Option<cmp::Ordering> {
         let left = self.as_bytes().iter().map(|b| b.to_ascii_lowercase());
         let right = other.data.as_bytes().iter().map(|b| b.to_ascii_lowercase());
@@ -660,10 +660,10 @@ mod tests {
     #[test]
     fn compares_with_a_string() {
         let authority: Authority = "def.com".parse().unwrap();
-        assert!(authority < "ghi.com".to_string());
-        assert!("ghi.com".to_string() > authority);
-        assert!(authority > "abc.com".to_string());
-        assert!("abc.com".to_string() < authority);
+        assert!(authority < "ghi.com");
+        assert!("ghi.com" > authority);
+        assert!(authority > "abc.com");
+        assert!("abc.com" < authority);
     }
 
     #[test]
diff --git a/src/uri/mod.rs b/src/uri/mod.rs
index 767f0743..ff9908e9 100644
--- a/src/uri/mod.rs
+++ b/src/uri/mod.rs
@@ -1001,7 +1001,7 @@ impl<'a> PartialEq<&'a str> for Uri {
     }
 }
 
-impl<'a> PartialEq<Uri> for &'a str {
+impl PartialEq<Uri> for &str {
     fn eq(&self, uri: &Uri) -> bool {
         uri == *self
     }
diff --git a/src/uri/path.rs b/src/uri/path.rs
index 8f9356e8..39a0db14 100644
--- a/src/uri/path.rs
+++ b/src/uri/path.rs
@@ -395,7 +395,7 @@ impl PartialEq<str> for PathAndQuery {
     }
 }
 
-impl<'a> PartialEq<PathAndQuery> for &'a str {
+impl PartialEq<PathAndQuery> for &str {
     #[inline]
     fn eq(&self, other: &PathAndQuery) -> bool {
         self == &other.as_str()
@@ -458,7 +458,7 @@ impl<'a> PartialOrd<&'a str> for PathAndQuery {
     }
 }
 
-impl<'a> PartialOrd<PathAndQuery> for &'a str {
+impl PartialOrd<PathAndQuery> for &str {
     #[inline]
     fn partial_cmp(&self, other: &PathAndQuery) -> Option<cmp::Ordering> {
         self.partial_cmp(&other.as_str())
@@ -620,10 +620,10 @@ mod tests {
     #[test]
     fn compares_with_a_string() {
         let path_and_query: PathAndQuery = "/b/world&foo=bar".parse().unwrap();
-        assert!(path_and_query < "/c/world&foo=bar".to_string());
-        assert!("/c/world&foo=bar".to_string() > path_and_query);
-        assert!(path_and_query > "/a/world&foo=bar".to_string());
-        assert!("/a/world&foo=bar".to_string() < path_and_query);
+        assert!(path_and_query < "/c/world&foo=bar");
+        assert!("/c/world&foo=bar" > path_and_query);
+        assert!(path_and_query > "/a/world&foo=bar");
+        assert!("/a/world&foo=bar" < path_and_query);
     }
 
     #[test]
@@ -671,6 +671,6 @@ mod tests {
     }
 
     fn pq(s: &str) -> PathAndQuery {
-        s.parse().expect(&format!("parsing {}", s))
+        s.parse().unwrap_or_else(|_| panic!("parsing {s}"))
     }
 }
diff --git a/src/uri/scheme.rs b/src/uri/scheme.rs
index dbcc8c3f..47a8bb1c 100644
--- a/src/uri/scheme.rs
+++ b/src/uri/scheme.rs
@@ -356,6 +356,6 @@ mod test {
     }
 
     fn scheme(s: &str) -> Scheme {
-        s.parse().expect(&format!("Invalid scheme: {}", s))
+        s.parse().unwrap_or_else(|_| panic!("Invalid scheme: {s}"))
     }
 }
diff --git a/tests/header_map.rs b/tests/header_map.rs
index 9a9d7e12..3dfbf25d 100644
--- a/tests/header_map.rs
+++ b/tests/header_map.rs
@@ -60,7 +60,7 @@ fn with_capacity_overflow() {
 fn reserve_overflow() {
     // See https://github.com/hyperium/http/issues/352
     let mut headers = HeaderMap::<u32>::with_capacity(0);
-    headers.reserve(std::usize::MAX); // next_power_of_two overflows
+    headers.reserve(usize::MAX); // next_power_of_two overflows
 }
 
 #[test]