diff --git a/src/cow_rc_str.rs b/src/cow_rc_str.rs
index 26508481..03631f47 100644
--- a/src/cow_rc_str.rs
+++ b/src/cow_rc_str.rs
@@ -51,7 +51,7 @@ impl<'a> From<&'a str> for CowRcStr<'a> {
     }
 }
 
-impl<'a> From<String> for CowRcStr<'a> {
+impl From<String> for CowRcStr<'_> {
     #[inline]
     fn from(s: String) -> Self {
         CowRcStr::from_rc(Rc::new(s))
@@ -84,7 +84,7 @@ impl<'a> CowRcStr<'a> {
     }
 }
 
-impl<'a> Clone for CowRcStr<'a> {
+impl Clone for CowRcStr<'_> {
     #[inline]
     fn clone(&self) -> Self {
         match self.unpack() {
@@ -99,7 +99,7 @@ impl<'a> Clone for CowRcStr<'a> {
     }
 }
 
-impl<'a> Drop for CowRcStr<'a> {
+impl Drop for CowRcStr<'_> {
     #[inline]
     fn drop(&mut self) {
         if let Err(ptr) = self.unpack() {
@@ -108,7 +108,7 @@ impl<'a> Drop for CowRcStr<'a> {
     }
 }
 
-impl<'a> ops::Deref for CowRcStr<'a> {
+impl ops::Deref for CowRcStr<'_> {
     type Target = str;
 
     #[inline]
@@ -119,65 +119,65 @@ impl<'a> ops::Deref for CowRcStr<'a> {
 
 // Boilerplate / trivial impls below.
 
-impl<'a> AsRef<str> for CowRcStr<'a> {
+impl AsRef<str> for CowRcStr<'_> {
     #[inline]
     fn as_ref(&self) -> &str {
         self
     }
 }
 
-impl<'a> Borrow<str> for CowRcStr<'a> {
+impl Borrow<str> for CowRcStr<'_> {
     #[inline]
     fn borrow(&self) -> &str {
         self
     }
 }
 
-impl<'a> Default for CowRcStr<'a> {
+impl Default for CowRcStr<'_> {
     #[inline]
     fn default() -> Self {
         Self::from("")
     }
 }
 
-impl<'a> hash::Hash for CowRcStr<'a> {
+impl hash::Hash for CowRcStr<'_> {
     #[inline]
     fn hash<H: hash::Hasher>(&self, hasher: &mut H) {
         str::hash(self, hasher)
     }
 }
 
-impl<'a, T: AsRef<str>> PartialEq<T> for CowRcStr<'a> {
+impl<T: AsRef<str>> PartialEq<T> for CowRcStr<'_> {
     #[inline]
     fn eq(&self, other: &T) -> bool {
         str::eq(self, other.as_ref())
     }
 }
 
-impl<'a, T: AsRef<str>> PartialOrd<T> for CowRcStr<'a> {
+impl<T: AsRef<str>> PartialOrd<T> for CowRcStr<'_> {
     #[inline]
     fn partial_cmp(&self, other: &T) -> Option<cmp::Ordering> {
         str::partial_cmp(self, other.as_ref())
     }
 }
 
-impl<'a> Eq for CowRcStr<'a> {}
+impl Eq for CowRcStr<'_> {}
 
-impl<'a> Ord for CowRcStr<'a> {
+impl Ord for CowRcStr<'_> {
     #[inline]
     fn cmp(&self, other: &Self) -> cmp::Ordering {
         str::cmp(self, other)
     }
 }
 
-impl<'a> fmt::Display for CowRcStr<'a> {
+impl fmt::Display for CowRcStr<'_> {
     #[inline]
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         str::fmt(self, formatter)
     }
 }
 
-impl<'a> fmt::Debug for CowRcStr<'a> {
+impl fmt::Debug for CowRcStr<'_> {
     #[inline]
     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
         str::fmt(self, formatter)
diff --git a/src/parser.rs b/src/parser.rs
index dd35fc50..0a432912 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -76,7 +76,7 @@ pub enum BasicParseErrorKind<'i> {
     QualifiedRuleInvalid,
 }
 
-impl<'i> fmt::Display for BasicParseErrorKind<'i> {
+impl fmt::Display for BasicParseErrorKind<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             BasicParseErrorKind::UnexpectedToken(token) => {
@@ -176,7 +176,7 @@ impl<'i, T> ParseErrorKind<'i, T> {
     }
 }
 
-impl<'i, E: fmt::Display> fmt::Display for ParseErrorKind<'i, E> {
+impl<E: fmt::Display> fmt::Display for ParseErrorKind<'_, E> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             ParseErrorKind::Basic(ref basic) => basic.fmt(f),
@@ -218,13 +218,13 @@ impl<'i, T> ParseError<'i, T> {
     }
 }
 
-impl<'i, E: fmt::Display> fmt::Display for ParseError<'i, E> {
+impl<E: fmt::Display> fmt::Display for ParseError<'_, E> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         self.kind.fmt(f)
     }
 }
 
-impl<'i, E: fmt::Display + fmt::Debug> std::error::Error for ParseError<'i, E> {}
+impl<E: fmt::Display + fmt::Debug> std::error::Error for ParseError<'_, E> {}
 
 /// The owned input for a parser.
 pub struct ParserInput<'i> {
diff --git a/src/rules_and_declarations.rs b/src/rules_and_declarations.rs
index 48da02b5..188e354e 100644
--- a/src/rules_and_declarations.rs
+++ b/src/rules_and_declarations.rs
@@ -241,7 +241,7 @@ impl<'i, 't, 'a, P, I, E> RuleBodyParser<'i, 't, 'a, P, I, E> {
 }
 
 /// https://drafts.csswg.org/css-syntax/#consume-a-blocks-contents
-impl<'i, 't, 'a, I, P, E: 'i> Iterator for RuleBodyParser<'i, 't, 'a, P, I, E>
+impl<'i, I, P, E: 'i> Iterator for RuleBodyParser<'i, '_, '_, P, I, E>
 where
     P: RuleBodyItemParser<'i, I, E>,
 {
@@ -349,7 +349,7 @@ where
 }
 
 /// `RuleListParser` is an iterator that yields `Ok(_)` for a rule or an `Err(..)` for an invalid one.
-impl<'i, 't, 'a, R, P, E: 'i> Iterator for StyleSheetParser<'i, 't, 'a, P>
+impl<'i, R, P, E: 'i> Iterator for StyleSheetParser<'i, '_, '_, P>
 where
     P: QualifiedRuleParser<'i, QualifiedRule = R, Error = E>
         + AtRuleParser<'i, AtRule = R, Error = E>,
diff --git a/src/serializer.rs b/src/serializer.rs
index 3c6e31cb..5df73954 100644
--- a/src/serializer.rs
+++ b/src/serializer.rs
@@ -55,7 +55,7 @@ where
     Ok(())
 }
 
-impl<'a> ToCss for Token<'a> {
+impl ToCss for Token<'_> {
     fn to_css<W>(&self, dest: &mut W) -> fmt::Result
     where
         W: fmt::Write,
@@ -311,7 +311,7 @@ where
     }
 }
 
-impl<'a, W> fmt::Write for CssStringWriter<'a, W>
+impl<W> fmt::Write for CssStringWriter<'_, W>
 where
     W: fmt::Write,
 {
@@ -539,7 +539,7 @@ impl TokenSerializationType {
     }
 }
 
-impl<'a> Token<'a> {
+impl Token<'_> {
     /// Categorize a token into a type that determines when `/**/` needs to be inserted
     /// between two tokens when serialized next to each other without whitespace in between.
     ///
diff --git a/src/tests.rs b/src/tests.rs
index 7389664d..ec0fc517 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -773,7 +773,7 @@ where
     }
 }
 
-impl<'a> ToJson for CowRcStr<'a> {
+impl ToJson for CowRcStr<'_> {
     fn to_json(&self) -> Value {
         let s: &str = self;
         s.to_json()
@@ -946,7 +946,7 @@ impl<'i> QualifiedRuleParser<'i> for JsonParser {
     }
 }
 
-impl<'i> RuleBodyItemParser<'i, Value, ()> for JsonParser {
+impl RuleBodyItemParser<'_, Value, ()> for JsonParser {
     fn parse_qualified(&self) -> bool {
         true
     }
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index ea173a5e..2e86c66a 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -190,7 +190,7 @@ pub enum Token<'a> {
     CloseCurlyBracket,
 }
 
-impl<'a> Token<'a> {
+impl Token<'_> {
     /// Return whether this token represents a parse error.
     ///
     /// `BadUrl` and `BadString` are tokenizer-level parse errors.
@@ -324,11 +324,11 @@ impl<'a> Tokenizer<'a> {
         let current = self.position();
         let start = self
             .slice(SourcePosition(0)..current)
-            .rfind(|c| matches!(c, '\r' | '\n' | '\x0C'))
+            .rfind(['\r', '\n', '\x0C'])
             .map_or(0, |start| start + 1);
         let end = self
             .slice(current..SourcePosition(self.input.len()))
-            .find(|c| matches!(c, '\r' | '\n' | '\x0C'))
+            .find(['\r', '\n', '\x0C'])
             .map_or(self.input.len(), |end| current.0 + end);
         self.slice(SourcePosition(start)..SourcePosition(end))
     }
@@ -720,9 +720,7 @@ fn check_for_source_map<'a>(tokenizer: &mut Tokenizer<'a>, contents: &'a str) {
     // If there is a source map directive, extract the URL.
     if contents.starts_with(directive) || contents.starts_with(directive_old) {
         let contents = &contents[directive.len()..];
-        tokenizer.source_map_url = contents
-            .split(|c| c == ' ' || c == '\t' || c == '\x0C' || c == '\r' || c == '\n')
-            .next()
+        tokenizer.source_map_url = contents.split([' ', '\t', '\x0C', '\r', '\n']).next();
     }
 
     let directive = "# sourceURL=";
@@ -731,9 +729,7 @@ fn check_for_source_map<'a>(tokenizer: &mut Tokenizer<'a>, contents: &'a str) {
     // If there is a source map directive, extract the URL.
     if contents.starts_with(directive) || contents.starts_with(directive_old) {
         let contents = &contents[directive.len()..];
-        tokenizer.source_url = contents
-            .split(|c| c == ' ' || c == '\t' || c == '\x0C' || c == '\r' || c == '\n')
-            .next()
+        tokenizer.source_url = contents.split([' ', '\t', '\x0C', '\r', '\n']).next()
     }
 }