diff --git a/Cargo.lock b/Cargo.lock
index 42d6983e..44ee2946 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -185,17 +185,27 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "2.33.3"
+version = "3.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+checksum = "7a30c3bf9ff12dfe5dae53f0a96e0febcd18420d1c0e7fad77796d9d5c4b5375"
 dependencies = [
- "ansi_term",
  "atty",
  "bitflags",
+ "indexmap",
+ "lazy_static",
+ "os_str_bytes",
  "strsim",
+ "termcolor",
  "textwrap",
- "unicode-width",
- "vec_map",
+]
+
+[[package]]
+name = "clap_complete"
+version = "3.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d044e9db8cd0f68191becdeb5246b7462e4cf0c069b19ae00d1bf3fa9889498d"
+dependencies = [
+ "clap",
 ]
 
 [[package]]
@@ -837,6 +847,7 @@ dependencies = [
  "assert_cmd",
  "chrono",
  "clap",
+ "clap_complete",
  "elasticlunr-rs",
  "env_logger",
  "futures-util",
@@ -1053,6 +1064,15 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "output_vt100"
 version = "0.1.2"
@@ -1590,9 +1610,9 @@ dependencies = [
 
 [[package]]
 name = "strsim"
-version = "0.8.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "strum"
@@ -1659,12 +1679,9 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.11.0"
+version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-dependencies = [
- "unicode-width",
-]
+checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
 
 [[package]]
 name = "time"
@@ -1872,12 +1889,6 @@ version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
 
-[[package]]
-name = "unicode-width"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
-
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"
@@ -1902,12 +1913,6 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
-[[package]]
-name = "vec_map"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
-
 [[package]]
 name = "version_check"
 version = "0.9.3"
diff --git a/Cargo.toml b/Cargo.toml
index e0aef886..e19cf12e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,8 @@ description = "Creates a book from markdown files"
 [dependencies]
 anyhow = "1.0.28"
 chrono = "0.4"
-clap = "2.24"
+clap = { version = "3.0", features = ["cargo"] }
+clap_complete = "3.0"
 env_logger = "0.7.1"
 handlebars = "4.0"
 lazy_static = "1.0"
diff --git a/examples/nop-preprocessor.rs b/examples/nop-preprocessor.rs
index 486fd86d..d53d8745 100644
--- a/examples/nop-preprocessor.rs
+++ b/examples/nop-preprocessor.rs
@@ -7,7 +7,7 @@ use semver::{Version, VersionReq};
 use std::io;
 use std::process;
 
-pub fn make_app() -> App<'static, 'static> {
+pub fn make_app() -> App<'static> {
     App::new("nop-preprocessor")
         .about("A mdbook preprocessor which does precisely nothing")
         .subcommand(
diff --git a/src/cmd/build.rs b/src/cmd/build.rs
index d1c66302..fd421a39 100644
--- a/src/cmd/build.rs
+++ b/src/cmd/build.rs
@@ -4,7 +4,7 @@ use mdbook::errors::Result;
 use mdbook::MDBook;
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("build")
         .about("Builds a book from its markdown files")
         .arg_from_usage(
diff --git a/src/cmd/clean.rs b/src/cmd/clean.rs
index b58f937e..0f368dda 100644
--- a/src/cmd/clean.rs
+++ b/src/cmd/clean.rs
@@ -5,7 +5,7 @@ use mdbook::MDBook;
 use std::fs;
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("clean")
         .about("Deletes a built book")
         .arg_from_usage(
diff --git a/src/cmd/init.rs b/src/cmd/init.rs
index ed0aa17d..d777c081 100644
--- a/src/cmd/init.rs
+++ b/src/cmd/init.rs
@@ -8,7 +8,7 @@ use std::io::Write;
 use std::process::Command;
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("init")
         .about("Creates the boilerplate structure and files for a new book")
         // the {n} denotes a newline which will properly aligned in all help messages
diff --git a/src/cmd/serve.rs b/src/cmd/serve.rs
index c5394f8a..0b46a1e5 100644
--- a/src/cmd/serve.rs
+++ b/src/cmd/serve.rs
@@ -18,7 +18,7 @@ use warp::Filter;
 const LIVE_RELOAD_ENDPOINT: &str = "__livereload";
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("serve")
         .about("Serves a book at http://localhost:3000, and rebuilds it on changes")
         .arg_from_usage(
@@ -32,7 +32,7 @@ pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
         )
         .arg(
             Arg::with_name("hostname")
-                .short("n")
+                .short('n')
                 .long("hostname")
                 .takes_value(true)
                 .default_value("localhost")
@@ -41,7 +41,7 @@ pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
         )
         .arg(
             Arg::with_name("port")
-                .short("p")
+                .short('p')
                 .long("port")
                 .takes_value(true)
                 .default_value("3000")
diff --git a/src/cmd/test.rs b/src/cmd/test.rs
index f6d97aa6..50470793 100644
--- a/src/cmd/test.rs
+++ b/src/cmd/test.rs
@@ -4,7 +4,7 @@ use mdbook::errors::Result;
 use mdbook::MDBook;
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("test")
         .about("Tests that a book's Rust code samples compile")
         .arg_from_usage(
@@ -17,10 +17,11 @@ pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
              (Defaults to the Current Directory when omitted)'",
         )
         .arg(Arg::with_name("library-path")
-            .short("L")
+            .short('L')
             .long("library-path")
             .value_name("dir")
             .takes_value(true)
+            .use_delimiter(true)
             .require_delimiter(true)
             .multiple(true)
             .empty_values(false)
diff --git a/src/cmd/watch.rs b/src/cmd/watch.rs
index b27516b0..992246ae 100644
--- a/src/cmd/watch.rs
+++ b/src/cmd/watch.rs
@@ -10,7 +10,7 @@ use std::thread::sleep;
 use std::time::Duration;
 
 // Create clap subcommand arguments
-pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
+pub fn make_subcommand<'help>() -> App<'help> {
     SubCommand::with_name("watch")
         .about("Watches a book's files and rebuilds it on changes")
         .arg_from_usage(
diff --git a/src/main.rs b/src/main.rs
index 1f286d2d..36f0fc02 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,8 @@ extern crate log;
 
 use anyhow::anyhow;
 use chrono::Local;
-use clap::{App, AppSettings, Arg, ArgMatches, Shell, SubCommand};
+use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
+use clap_complete::Shell;
 use env_logger::Builder;
 use log::LevelFilter;
 use mdbook::utils;
@@ -25,25 +26,31 @@ fn main() {
 
     // Check which subcomamnd the user ran...
     let res = match app.get_matches().subcommand() {
-        ("init", Some(sub_matches)) => cmd::init::execute(sub_matches),
-        ("build", Some(sub_matches)) => cmd::build::execute(sub_matches),
-        ("clean", Some(sub_matches)) => cmd::clean::execute(sub_matches),
+        Some(("init", sub_matches)) => cmd::init::execute(sub_matches),
+        Some(("build", sub_matches)) => cmd::build::execute(sub_matches),
+        Some(("clean", sub_matches)) => cmd::clean::execute(sub_matches),
         #[cfg(feature = "watch")]
-        ("watch", Some(sub_matches)) => cmd::watch::execute(sub_matches),
+        Some(("watch", sub_matches)) => cmd::watch::execute(sub_matches),
         #[cfg(feature = "serve")]
-        ("serve", Some(sub_matches)) => cmd::serve::execute(sub_matches),
-        ("test", Some(sub_matches)) => cmd::test::execute(sub_matches),
-        ("completions", Some(sub_matches)) => (|| {
+        Some(("serve", sub_matches)) => cmd::serve::execute(sub_matches),
+        Some(("test", sub_matches)) => cmd::test::execute(sub_matches),
+        Some(("completions", sub_matches)) => (|| {
             let shell: Shell = sub_matches
                 .value_of("shell")
                 .ok_or_else(|| anyhow!("Shell name missing."))?
                 .parse()
                 .map_err(|s| anyhow!("Invalid shell: {}", s))?;
 
-            create_clap_app().gen_completions_to("mdbook", shell, &mut std::io::stdout().lock());
+            let mut complete_app = create_clap_app();
+            clap_complete::generate(
+                shell,
+                &mut complete_app,
+                "mdbook",
+                &mut std::io::stdout().lock(),
+            );
             Ok(())
         })(),
-        (_, _) => unreachable!(),
+        _ => unreachable!(),
     };
 
     if let Err(e) = res {
@@ -54,7 +61,7 @@ fn main() {
 }
 
 /// Create a list of valid arguments and sub-commands
-fn create_clap_app<'a, 'b>() -> App<'a, 'b> {
+fn create_clap_app() -> App<'static> {
     let app = App::new(crate_name!())
         .about(crate_description!())
         .author("Mathieu David <mathieudavid@mathieudavid.org>")
@@ -76,7 +83,7 @@ fn create_clap_app<'a, 'b>() -> App<'a, 'b> {
                 .arg(
                     Arg::with_name("shell")
                         .takes_value(true)
-                        .possible_values(&Shell::variants())
+                        .possible_values(Shell::possible_values())
                         .help("the shell to generate completions for")
                         .value_name("SHELL")
                         .required(true),
@@ -137,3 +144,8 @@ fn open<P: AsRef<OsStr>>(path: P) {
         error!("Error opening web browser: {}", e);
     }
 }
+
+#[test]
+fn verify_app() {
+    create_clap_app().debug_assert();
+}