diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a7be6aec..d0641a84 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
           - nightly
           - beta
           - stable
-          - 1.63.0
+          - 1.66.0
         features:
           -
           - --features dummy_match_byte
diff --git a/Cargo.toml b/Cargo.toml
index 6604f20e..90e0b573 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 keywords = ["css", "syntax", "parser"]
 license = "MPL-2.0"
 edition = "2018"
-rust-version = "1.63"
+rust-version = "1.66"
 
 exclude = ["src/css-parsing-tests/**", "src/big-data-url.css"]
 
@@ -23,7 +23,7 @@ encoding_rs = "0.8"
 cssparser-macros = { path = "./macros", version = "0.6.1" }
 dtoa-short = "0.3"
 itoa = "1.0"
-phf = { version = "0.11.2", features = ["macros"] }
+phf = { version = "0.13.1", features = ["macros"] }
 serde = { version = "1.0", features = ["derive"], optional = true }
 malloc_size_of = { version = "0.1", default-features = false, optional = true }
 smallvec = "1.0"
diff --git a/macros/lib.rs b/macros/lib.rs
index 8b40bd4c..dc7b36e3 100644
--- a/macros/lib.rs
+++ b/macros/lib.rs
@@ -162,7 +162,7 @@ pub fn match_byte(input: TokenStream) -> TokenStream {
     for (i, ref arm) in arms.iter().enumerate() {
         let case_id = i + 1;
         let index = case_id as isize;
-        let name = syn::Ident::new(&format!("Case{}", case_id), arm.span());
+        let name = syn::Ident::new(&format!("Case{case_id}"), arm.span());
         let pat = &arm.pat;
         parse_pat_to_table(pat, case_id as u8, &mut wildcard, &mut table);
 
@@ -177,7 +177,7 @@ pub fn match_byte(input: TokenStream) -> TokenStream {
 
     let mut table_content = Vec::new();
     for entry in table.iter() {
-        let name: syn::Path = syn::parse_str(&format!("Case::Case{}", entry)).unwrap();
+        let name: syn::Path = syn::parse_str(&format!("Case::Case{entry}")).unwrap();
         table_content.push(name);
     }
     let table = quote::quote!(static __CASES: [Case; 256] = [#(#table_content),*];);
diff --git a/src/lib.rs b/src/lib.rs
index dc44fb74..a7460a43 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,7 +41,7 @@ As a consequence, when calling another parsing function, either:
 
 Examples:
 
-```{rust,ignore}
+```rust,ignore
 // 'none' | <image>
 fn parse_background_image(context: &ParserContext, input: &mut Parser)
                                     -> Result<Option<Image>, ()> {
@@ -53,7 +53,7 @@ fn parse_background_image(context: &ParserContext, input: &mut Parser)
 }
 ```
 
-```{rust,ignore}
+```rust,ignore
 // [ <length> | <percentage> ] [ <length> | <percentage> ]?
 fn parse_border_spacing(_context: &ParserContext, input: &mut Parser)
                           -> Result<(LengthOrPercentage, LengthOrPercentage), ()> {
diff --git a/src/parser.rs b/src/parser.rs
index aabeea6a..82ec4b00 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -80,11 +80,11 @@ impl fmt::Display for BasicParseErrorKind<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             BasicParseErrorKind::UnexpectedToken(token) => {
-                write!(f, "unexpected token: {:?}", token)
+                write!(f, "unexpected token: {token:?}")
             }
             BasicParseErrorKind::EndOfInput => write!(f, "unexpected end of input"),
             BasicParseErrorKind::AtRuleInvalid(rule) => {
-                write!(f, "invalid @ rule encountered: '@{}'", rule)
+                write!(f, "invalid @ rule encountered: '@{rule}'")
             }
             BasicParseErrorKind::AtRuleBodyInvalid => write!(f, "invalid @ rule body encountered"),
             BasicParseErrorKind::QualifiedRuleInvalid => {
@@ -295,7 +295,7 @@ impl BlockType {
 ///
 /// The union of two sets can be obtained with the `|` operator. Example:
 ///
-/// ```{rust,ignore}
+/// ```rust,ignore
 /// input.parse_until_before(Delimiter::CurlyBracketBlock | Delimiter::Semicolon)
 /// ```
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
diff --git a/src/serializer.rs b/src/serializer.rs
index 6696a622..ed325fc9 100644
--- a/src/serializer.rs
+++ b/src/serializer.rs
@@ -286,7 +286,7 @@ where
 ///
 /// Typical usage:
 ///
-/// ```{rust,ignore}
+/// ```rust,ignore
 /// fn write_foo<W>(foo: &Foo, dest: &mut W) -> fmt::Result where W: fmt::Write {
 ///     dest.write_str("\"")?;
 ///     {
diff --git a/src/tests.rs b/src/tests.rs
index 3c122f0d..d7b4833e 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -794,7 +794,7 @@ fn delimiter_from_byte(b: &mut Bencher) {
 }
 
 #[cfg(feature = "bench")]
-const BACKGROUND_IMAGE: &'static str = include_str!("big-data-url.css");
+const BACKGROUND_IMAGE: &str = include_str!("big-data-url.css");
 
 #[cfg(feature = "bench")]
 #[bench]
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index 1c85e10a..1e2bb737 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -229,7 +229,7 @@ enum SeenStatus {
 
 impl<'a> Tokenizer<'a> {
     #[inline]
-    pub fn new(input: &str) -> Tokenizer {
+    pub fn new(input: &'a str) -> Self {
         Tokenizer {
             input,
             position: 0,