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index a914e1d..e502be2 100644
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 [[package]]
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 dependencies = [
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 [[package]]
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 dependencies = [
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde",
+ "serde_spanned",
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 [[package]]
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-version = "0.5.6"
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 dependencies = [
- "serde 1.0.105 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde",
 ]
 
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+ "indexmap",
+ "serde",
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 [[package]]
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 [[package]]
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- "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
 ]
 
 [[package]]
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+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
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+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
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+[[package]]
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+[[package]]
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+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
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+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "winnow"
+version = "0.5.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c2e3184b9c4e92ad5167ca73039d0c42476302ab603e2fec4487511f38ccefc"
+dependencies = [
+ "memchr",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 190b163..902976a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "cargo-readme"
 version = "3.2.0"
+edition = "2021"
 authors = ["Livio Ribeiro <livioribeiro@outlook.com>"]
 description = "A cargo subcommand to generate README.md content from doc comments"
 repository = "https://github.com/webern/cargo-readme"
@@ -11,12 +12,11 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 clap = "2.32"
-toml = "0.5"
-regex = "1.0"
-serde = "1.0"
-serde_derive = "1.0"
-percent-encoding = "2.1"
-lazy_static = "1.1"
+toml = "0.7"
+regex = "1"
+serde = { version = "1", features = ["derive"] }
+percent-encoding = "2"
+lazy_static = "1"
 
 [dev-dependencies]
 assert_cli = "0.6"
diff --git a/src/config/manifest.rs b/src/config/manifest.rs
index 0d382be..777060e 100644
--- a/src/config/manifest.rs
+++ b/src/config/manifest.rs
@@ -1,5 +1,6 @@
 //! Read crate information from `Cargo.toml`
 
+use serde::Deserialize;
 use std::collections::BTreeMap;
 use std::fs::File;
 use std::io::Read;
diff --git a/src/config/project.rs b/src/config/project.rs
index 7e6797f..29c346e 100644
--- a/src/config/project.rs
+++ b/src/config/project.rs
@@ -1,7 +1,7 @@
 use std::env;
 use std::path::{Path, PathBuf};
 
-use config::manifest::{Manifest, ManifestLib};
+use crate::config::manifest::{Manifest, ManifestLib};
 
 /// Get the project root from given path or defaults to current directory
 ///
diff --git a/src/lib.rs b/src/lib.rs
index f9916e3..d34192d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -142,15 +142,6 @@
 //! By default, `README.tpl` will be used as the template, but you can override it using the
 //! `--template` to choose a different template or `--no-template` to disable it.
 
-#[macro_use]
-extern crate serde_derive;
-#[macro_use]
-extern crate lazy_static;
-
-extern crate percent_encoding;
-extern crate regex;
-extern crate toml;
-
 mod config;
 mod readme;
 
diff --git a/src/main.rs b/src/main.rs
index f8cf816..5e347d0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,13 +1,10 @@
 //! Generate README.md from doc comments.
 
-#[macro_use]
 extern crate clap;
 
-extern crate cargo_readme;
-
 use std::io::{self, Write};
 
-use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
+use clap::{crate_version, App, AppSettings, Arg, ArgMatches, SubCommand};
 
 mod helper;
 
diff --git a/src/readme/mod.rs b/src/readme/mod.rs
index a435cde..103777e 100644
--- a/src/readme/mod.rs
+++ b/src/readme/mod.rs
@@ -5,7 +5,7 @@ mod extract;
 mod process;
 mod template;
 
-use config;
+use crate::config;
 
 /// Generates readme data from `source` file
 ///
diff --git a/src/readme/process.rs b/src/readme/process.rs
index 9664253..d286aed 100644
--- a/src/readme/process.rs
+++ b/src/readme/process.rs
@@ -4,9 +4,9 @@
 //! - "```", "```no_run", "```ignore" and "```should_panic" are converted to "```rust"
 //! - markdown heading are indentend to be one level lower, so the crate name is at the top level
 
-use std::iter::{IntoIterator, Iterator};
-
+use lazy_static::lazy_static;
 use regex::Regex;
+use std::iter::{IntoIterator, Iterator};
 
 lazy_static! {
     // Is this code block rust?
diff --git a/src/readme/template.rs b/src/readme/template.rs
index 13b80c2..068e22b 100644
--- a/src/readme/template.rs
+++ b/src/readme/template.rs
@@ -1,4 +1,4 @@
-use config::Manifest;
+use crate::config::Manifest;
 
 /// Renders the template
 ///
diff --git a/tests/alternate-input.rs b/tests/alternate-input.rs
index 2ec88fe..1a45531 100644
--- a/tests/alternate-input.rs
+++ b/tests/alternate-input.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 #[test]
diff --git a/tests/alternate-template.rs b/tests/alternate-template.rs
index a7c36e9..b265b9e 100644
--- a/tests/alternate-template.rs
+++ b/tests/alternate-template.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/append-license.rs b/tests/append-license.rs
index a480b89..8202c3a 100644
--- a/tests/append-license.rs
+++ b/tests/append-license.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/badges.rs b/tests/badges.rs
index ae210fe..c2510ce 100644
--- a/tests/badges.rs
+++ b/tests/badges.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/default-behavior.rs b/tests/default-behavior.rs
index 3dca861..c1fe90a 100644
--- a/tests/default-behavior.rs
+++ b/tests/default-behavior.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/entrypoint-resolution.rs b/tests/entrypoint-resolution.rs
index ff28294..5192d92 100644
--- a/tests/entrypoint-resolution.rs
+++ b/tests/entrypoint-resolution.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 #[test]
diff --git a/tests/multiline-doc.rs b/tests/multiline-doc.rs
index f32c489..f0e12ba 100644
--- a/tests/multiline-doc.rs
+++ b/tests/multiline-doc.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/multiple-bin-fail.rs b/tests/multiple-bin-fail.rs
index 96abb70..2f9b14a 100644
--- a/tests/multiple-bin-fail.rs
+++ b/tests/multiple-bin-fail.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = "Error: Multiple binaries found, choose one: [src/entry1.rs, src/entry2.rs]";
diff --git a/tests/no-entrypoint-fail.rs b/tests/no-entrypoint-fail.rs
index f0c42a5..319b750 100644
--- a/tests/no-entrypoint-fail.rs
+++ b/tests/no-entrypoint-fail.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = "Error: No entrypoint found";
diff --git a/tests/no-template.rs b/tests/no-template.rs
index 7869efc..47dbebd 100644
--- a/tests/no-template.rs
+++ b/tests/no-template.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = r#"
diff --git a/tests/project-with-version.rs b/tests/project-with-version.rs
index 65ae8fb..6024667 100644
--- a/tests/project-with-version.rs
+++ b/tests/project-with-version.rs
@@ -1,5 +1,3 @@
-extern crate assert_cli;
-
 use assert_cli::Assert;
 
 const EXPECTED: &str = "# project-with-version