diff --git a/examples/application/Cargo.toml b/examples/application/Cargo.toml
index 0316c80..4f7e08b 100644
--- a/examples/application/Cargo.toml
+++ b/examples/application/Cargo.toml
@@ -5,4 +5,5 @@ edition = "2018"
 workspace = "../"
 
 [dependencies]
-actix-web = "1.0"
+actix-web = "2.0"
+actix-rt = "1.0"
diff --git a/examples/application/src/app.rs b/examples/application/src/app.rs
index 7dadc5c..dafb372 100644
--- a/examples/application/src/app.rs
+++ b/examples/application/src/app.rs
@@ -1,12 +1,13 @@
 // <setup>
 use actix_web::{web, App, Responder};
 
-fn index() -> impl Responder {
+async fn index() -> impl Responder {
     "Hello world!"
 }
 
 #[rustfmt::skip]
-pub fn main() {
+#[actix_rt::main]
+async fn main() {
     App::new().service(
         web::scope("/app")
             .route("/index.html", web::get().to(index)));
diff --git a/examples/application/src/combine.rs b/examples/application/src/combine.rs
index 0ce5a88..ce11025 100644
--- a/examples/application/src/combine.rs
+++ b/examples/application/src/combine.rs
@@ -5,7 +5,8 @@ struct State1;
 struct State2;
 
 #[rustfmt::skip]
-pub fn main() {
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
     HttpServer::new(|| {
         App::new()
             .service(
@@ -17,9 +18,8 @@ pub fn main() {
                     .data(State2)
                     .route("/", web::to(|| HttpResponse::Ok())))
     })
-    .bind("127.0.0.1:8088")
-    .unwrap()
+    .bind("127.0.0.1:8088")?
     .run()
-    .unwrap();
+    .await
 }
 // </combine>
diff --git a/examples/application/src/config.rs b/examples/application/src/config.rs
index 6d1b9a3..6051dd6 100644
--- a/examples/application/src/config.rs
+++ b/examples/application/src/config.rs
@@ -19,16 +19,16 @@ fn config(cfg: &mut web::ServiceConfig) {
     );
 }
 
-pub fn main() {
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
     HttpServer::new(|| {
         App::new()
             .configure(config)
             .service(web::scope("/api").configure(scoped_config))
             .route("/", web::get().to(|| HttpResponse::Ok().body("/")))
     })
-    .bind("127.0.0.1:8088")
-    .unwrap()
+    .bind("127.0.0.1:8088")?
     .run()
-    .unwrap();
+    .await
 }
 // </config>
diff --git a/examples/application/src/scope.rs b/examples/application/src/scope.rs
index b9c5742..84a7087 100644
--- a/examples/application/src/scope.rs
+++ b/examples/application/src/scope.rs
@@ -1,12 +1,13 @@
 use actix_web::{web, App, HttpRequest, Responder};
 
-fn show_users(_req: HttpRequest) -> impl Responder {
-    unimplemented!()
+async fn show_users(_req: HttpRequest) -> impl Responder {
+    "unimplemented!"
 }
 
 #[rustfmt::skip]
 // <scope>
-pub fn main() {
+#[actix_rt::main]
+async fn main() {
     App::new()
         .service(
             web::scope("/users")
diff --git a/examples/application/src/state.rs b/examples/application/src/state.rs
index c2a7abd..2bb5a0e 100644
--- a/examples/application/src/state.rs
+++ b/examples/application/src/state.rs
@@ -7,7 +7,7 @@ struct AppState {
     app_name: String,
 }
 
-fn index(data: web::Data<AppState>) -> String {
+async fn index(data: web::Data<AppState>) -> String {
     let app_name = &data.app_name; // <- get app_name
 
     format!("Hello {}!", app_name) // <- response with app_name
@@ -19,7 +19,7 @@ struct AppStateWithCounter {
     counter: Mutex<i32>, // <- Mutex is necessary to mutate safely across threads
 }
 
-fn _index(data: web::Data<AppStateWithCounter>) -> String {
+async fn _index(data: web::Data<AppStateWithCounter>) -> String {
     let mut counter = data.counter.lock().unwrap(); // <- get counter's MutexGuard
     *counter += 1; // <- access counter inside MutexGuard
 
@@ -28,25 +28,26 @@ fn _index(data: web::Data<AppStateWithCounter>) -> String {
 // </setup_mutable>
 
 // <make_app_mutable>
-fn _main() {
+#[actix_rt::main]
+async fn _main() -> std::io::Result<()> {
     let counter = web::Data::new(AppStateWithCounter {
         counter: Mutex::new(0),
     });
 
     HttpServer::new(move || { // move counter into the closure
         App::new()
-            .register_data(counter.clone()) // <- register the created data
+            .app_data(counter.clone()) // <- register the created data
             .route("/", web::get().to(_index))
     })
-        .bind("127.0.0.1:8088")
-        .unwrap()
+        .bind("127.0.0.1:8088")?
         .run()
-        .unwrap();
+        .await
 }
 // </make_app_mutable>
 
 // <start_app>
-pub fn main() {
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
     HttpServer::new(|| {
         App::new()
             .data(AppState {
@@ -54,9 +55,8 @@ pub fn main() {
             })
             .route("/", web::get().to(index))
     })
-    .bind("127.0.0.1:8088")
-    .unwrap()
+    .bind("127.0.0.1:8088")?
     .run()
-    .unwrap();
+    .await
 }
 // </start_app>
diff --git a/examples/application/src/vh.rs b/examples/application/src/vh.rs
index bd8e34e..d1d6c82 100644
--- a/examples/application/src/vh.rs
+++ b/examples/application/src/vh.rs
@@ -1,7 +1,8 @@
 use actix_web::{guard, web, App, HttpResponse, HttpServer};
 
 // <vh>
-pub fn main() {
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
     HttpServer::new(|| {
         App::new()
             .service(
@@ -16,9 +17,8 @@ pub fn main() {
             )
             .route("/", web::to(|| HttpResponse::Ok()))
     })
-    .bind("127.0.0.1:8088")
-    .unwrap()
+    .bind("127.0.0.1:8088")?
     .run()
-    .unwrap();
+    .await
 }
 // </vh>