diff --git a/Cargo.toml b/Cargo.toml
index 8ef37c6..7a08d9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,13 +8,16 @@ license = "MIT"
 repository = "https://github.com/tomaka/wasm-timer"
 
 [dependencies]
-futures-preview = "0.3.0-alpha"
+futures = "0.3.1"
 parking_lot = "0.9"
 pin-utils = "0.1.0-alpha.4"
 
 [target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
-js-sys = "0.3.14"
+js-sys = "0.3.31"
 send_wrapper = "0.2"
-wasm-bindgen = { version = "0.2.37" }
-wasm-bindgen-futures = { version = "0.3.25", features = ["futures_0_3"] }
-web-sys = { version = "0.3.14", features = ["Performance", "Window"] }
+wasm-bindgen = "0.2.37"
+wasm-bindgen-futures = "0.4.4"
+web-sys = { version = "0.3.31", features = ["Performance", "Window"] }
+
+[dev-dependencies]
+async-std = "1.0"
diff --git a/src/timer/ext.rs b/src/timer/ext.rs
index 1b14950..060ae83 100644
--- a/src/timer/ext.rs
+++ b/src/timer/ext.rs
@@ -27,24 +27,24 @@ pub trait TryFutureExt: TryFuture + Sized {
     /// # Examples
     ///
     /// ```no_run
-    /// # #![feature(async_await)]
     /// use std::time::Duration;
     /// use futures::prelude::*;
-    /// use futures_timer::TryFutureExt;
+    /// use wasm_timer::TryFutureExt;
     ///
     /// # fn long_future() -> impl TryFuture<Ok = (), Error = std::io::Error> {
     /// #     futures::future::ok(())
     /// # }
     /// #
-    /// #[runtime::main]
-    /// async fn main() {
+    /// fn main() {
     ///     let future = long_future();
     ///     let timed_out = future.timeout(Duration::from_secs(1));
     ///
-    ///     match timed_out.await {
-    ///         Ok(item) => println!("got {:?} within enough time!", item),
-    ///         Err(_) => println!("took too long to produce the item"),
-    ///     }
+    ///     async_std::task::block_on(async {
+    ///         match timed_out.await {
+    ///             Ok(item) => println!("got {:?} within enough time!", item),
+    ///             Err(_) => println!("took too long to produce the item"),
+    ///         }
+    ///     })
     /// }
     /// ```
     fn timeout(self, dur: Duration) -> Timeout<Self>