diff --git a/actix-codec/CHANGES.md b/actix-codec/CHANGES.md
index c8b7fbe3..6aa05bcf 100644
--- a/actix-codec/CHANGES.md
+++ b/actix-codec/CHANGES.md
@@ -1,6 +1,8 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
+* Update `tokio` dependency to 0.3.1
+* Update `tokio-util` dependency to 0.4
 
 ## 0.3.0 - 2020-08-23
 * No changes from beta 2.
diff --git a/actix-codec/Cargo.toml b/actix-codec/Cargo.toml
index f6407de2..7280a43c 100644
--- a/actix-codec/Cargo.toml
+++ b/actix-codec/Cargo.toml
@@ -17,10 +17,12 @@ path = "src/lib.rs"
 
 [dependencies]
 bitflags = "1.2.1"
-bytes = "0.5.2"
+
+# ToDo: update to bytes 0.6 when tokio-util is bytes 0.6 compat
+bytes = "0.5"
 futures-core = { version = "0.3.4", default-features = false }
 futures-sink = { version = "0.3.4", default-features = false }
 log = "0.4"
 pin-project = "0.4.17"
-tokio = "0.3.0"
+tokio = "0.3.1"
 tokio-util = { version = "0.4.0", default-features = false, features = ["codec"] }
diff --git a/actix-connect/CHANGES.md b/actix-connect/CHANGES.md
index 6f18b5b4..f9a78289 100644
--- a/actix-connect/CHANGES.md
+++ b/actix-connect/CHANGES.md
@@ -1,7 +1,8 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
-
+* Update `tokio-openssl` dependency to 0.5
+* Update `tokio-rustls` dependency to 0.20
 
 ## 2.0.0 - 2020-09-02
 - No significant changes from `2.0.0-alpha.4`.
diff --git a/actix-connect/Cargo.toml b/actix-connect/Cargo.toml
index 425e3605..b60ceeb9 100644
--- a/actix-connect/Cargo.toml
+++ b/actix-connect/Cargo.toml
@@ -54,5 +54,5 @@ tokio-rustls = { version = "0.20.0", optional = true }
 webpki = { version = "0.21", optional = true }
 
 [dev-dependencies]
-bytes = "0.5.3"
+bytes = "0.6"
 actix-testing = "1.0.0"
diff --git a/actix-rt/CHANGES.md b/actix-rt/CHANGES.md
index 232a85d1..8fd1a32c 100644
--- a/actix-rt/CHANGES.md
+++ b/actix-rt/CHANGES.md
@@ -7,7 +7,8 @@
 * Add `System::attach_to_tokio` method. [#173]
 
 ### Changed
-* update tokio to 0.3
+* Update `tokio` dependency to 0.3.1
+* Rename `time` module `delay_for` to `sleep`, `delay_until` to `sleep_until`, `Delay` to `Sleep` to keep inline with tokio.
 * Remove `'static` lifetime requirement for `Runtime::block_on` and `SystemRunner::block_on`. These methods would accept a &Self when calling.
 * Remove `'static` lifetime requirement for `System::run`
 
diff --git a/actix-rt/Cargo.toml b/actix-rt/Cargo.toml
index 4eced1a4..75a12590 100644
--- a/actix-rt/Cargo.toml
+++ b/actix-rt/Cargo.toml
@@ -22,7 +22,7 @@ futures-channel = { version = "0.3.4", default-features = false }
 futures-util = { version = "0.3.4", default-features = false, features = ["alloc"] }
 copyless = "0.1.4"
 smallvec = "1"
-tokio = { version = "0.3.0", features = ["rt", "net", "signal", "stream", "time"] }
+tokio = { version = "0.3.1", features = ["rt", "net", "signal", "stream", "time"] }
 
 [dev-dependencies]
-tokio = { version = "0.3.0", features = ["full"] }
+tokio = { version = "0.3.1", features = ["full"] }
diff --git a/actix-server/CHANGES.md b/actix-server/CHANGES.md
index c843736d..6d5c2b73 100644
--- a/actix-server/CHANGES.md
+++ b/actix-server/CHANGES.md
@@ -1,7 +1,8 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
-* Update mio to 0.7.3
+* Update `mio` dependency to 0.7.3
+* `ServerBuilder::backlog` would accept `u32` instead of `i32`
 * Use `concurrent-queue` to manage poll wakes instead of `futures::channel::mpsc`.
 * Remove `AcceptNotify` type and pass `WakerQueue` to `WorkerClient` for notify the `Accept` more directly.
 * Convert `mio::Stream` to `actix_rt::net::TcpStream`(`UnixStream` for uds) using `FromRawFd` and `IntoRawFd`(`IntoRawSocket` and `FromRawSocket` on windows).
diff --git a/actix-server/Cargo.toml b/actix-server/Cargo.toml
index cf5e87eb..e2e74893 100644
--- a/actix-server/Cargo.toml
+++ b/actix-server/Cargo.toml
@@ -32,11 +32,10 @@ log = "0.4"
 mio = { version = "0.7.3", features = [ "os-poll", "tcp", "uds"] }
 num_cpus = "1.13"
 slab = "0.4"
-socket2 = "0.3"
 
 [dev-dependencies]
 actix-testing = "1.0.0"
 bytes = "0.5"
 env_logger = "0.7"
 futures-util = { version = "0.3.4", default-features = false, features = ["sink"] }
-tokio = { version = "0.3.0", features = ["full"] }
+tokio = { version = "0.3.1", features = ["full"] }
diff --git a/actix-server/examples/basic.rs b/actix-server/examples/basic.rs
index b60a6a05..3f4d87cf 100644
--- a/actix-server/examples/basic.rs
+++ b/actix-server/examples/basic.rs
@@ -18,6 +18,7 @@ use std::{env, io};
 use actix_rt::net::TcpStream;
 use actix_server::Server;
 use actix_service::pipeline_factory;
+use bytes::BytesMut;
 use futures_util::future::ok;
 use log::{error, info};
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
@@ -48,10 +49,10 @@ async fn main() -> io::Result<()> {
                     let num = num + 1;
 
                     let mut size = 0;
-                    // FixMe: BytesMut and Vec are not working?
-                    let mut buf = [0; 1024];
+                    let mut buf = BytesMut::new();
 
                     loop {
+                        // ToDo: change to read_buf
                         match stream.read(&mut buf).await {
                             // end of stream; bail from loop
                             Ok(0) => break,
diff --git a/actix-server/src/accept.rs b/actix-server/src/accept.rs
index 690950df..0ee8c128 100644
--- a/actix-server/src/accept.rs
+++ b/actix-server/src/accept.rs
@@ -8,7 +8,7 @@ use mio::{Interest, Poll, Token as MioToken};
 use slab::Slab;
 
 use crate::server::Server;
-use crate::socket::{MioSocketListener, SocketAddr, StdListener};
+use crate::socket::{MioListener, SocketAddr};
 use crate::waker_queue::{WakerInterest, WakerQueue, WakerQueueError, WAKER_TOKEN};
 use crate::worker::{Conn, WorkerHandle};
 use crate::Token;
@@ -19,7 +19,7 @@ struct ServerSocketInfo {
     // be ware this is the crate token for identify socket and should not be confused with
     // mio::Token
     token: Token,
-    lst: MioSocketListener,
+    lst: MioListener,
     // timeout is used to mark the deadline when this socket's listener should be registered again
     // after an error.
     timeout: Option<Instant>,
@@ -40,7 +40,8 @@ pub(crate) struct AcceptLoop {
 impl AcceptLoop {
     pub fn new(srv: Server) -> Self {
         let poll = Poll::new().unwrap_or_else(|e| panic!("Can not create mio::Poll: {}", e));
-        let waker = WakerQueue::with_capacity(poll.registry(), 128).unwrap();
+        let waker = WakerQueue::with_capacity(poll.registry(), 128)
+            .unwrap_or_else(|e| panic!("Can not create mio::Waker: {}", e));
 
         Self {
             srv: Some(srv),
@@ -59,7 +60,7 @@ impl AcceptLoop {
 
     pub(crate) fn start(
         &mut self,
-        socks: Vec<(Token, StdListener)>,
+        socks: Vec<(Token, MioListener)>,
         workers: Vec<WorkerHandle>,
     ) {
         let srv = self.srv.take().expect("Can not re-use AcceptInfo");
@@ -99,7 +100,7 @@ impl Accept {
     pub(crate) fn start(
         poll: Poll,
         waker: WakerQueue,
-        socks: Vec<(Token, StdListener)>,
+        socks: Vec<(Token, MioListener)>,
         srv: Server,
         workers: Vec<WorkerHandle>,
     ) {
@@ -120,29 +121,26 @@ impl Accept {
     fn new_with_sockets(
         poll: Poll,
         waker: WakerQueue,
-        socks: Vec<(Token, StdListener)>,
+        socks: Vec<(Token, MioListener)>,
         workers: Vec<WorkerHandle>,
         srv: Server,
     ) -> (Accept, Slab<ServerSocketInfo>) {
         let mut sockets = Slab::new();
-        for (hnd_token, lst) in socks.into_iter() {
+        for (hnd_token, mut lst) in socks.into_iter() {
             let addr = lst.local_addr();
 
-            let mut sock = lst
-                .into_mio_listener()
-                .unwrap_or_else(|e| panic!("Can not set non_block on listener: {}", e));
             let entry = sockets.vacant_entry();
             let token = entry.key();
 
             // Start listening for incoming connections
             poll.registry()
-                .register(&mut sock, MioToken(token + DELTA), Interest::READABLE)
+                .register(&mut lst, MioToken(token + DELTA), Interest::READABLE)
                 .unwrap_or_else(|e| panic!("Can not register io: {}", e));
 
             entry.insert(ServerSocketInfo {
                 addr,
                 token: hnd_token,
-                lst: sock,
+                lst,
                 timeout: None,
             });
         }
@@ -175,17 +173,21 @@ impl Accept {
                     // necessary/good practice to actively drain the waker queue.
                     WAKER_TOKEN => 'waker: loop {
                         match self.waker.pop() {
-                            // worker notify it's availability has change. we maybe want to enter
-                            // backpressure or recover from one.
+                            // worker notify it's availability has change. we maybe want to recover
+                            // from backpressure.
                             Ok(WakerInterest::Notify) => {
                                 self.maybe_backpressure(&mut sockets, false);
                             }
                             Ok(WakerInterest::Pause) => {
                                 sockets.iter_mut().for_each(|(_, info)| {
-                                    if let Err(err) = self.deregister(info) {
-                                        error!("Can not deregister server socket {}", err);
-                                    } else {
-                                        info!("Paused accepting connections on {}", info.addr);
+                                    match self.deregister(info) {
+                                        Ok(_) => info!(
+                                            "Paused accepting connections on {}",
+                                            info.addr
+                                        ),
+                                        Err(e) => {
+                                            error!("Can not deregister server socket {}", e)
+                                        }
                                     }
                                 });
                             }
@@ -253,11 +255,7 @@ impl Accept {
         // Calling reregister seems to fix the issue.
         self.poll
             .registry()
-            .register(
-                &mut info.lst,
-                mio::Token(token + DELTA),
-                Interest::READABLE,
-            )
+            .register(&mut info.lst, mio::Token(token + DELTA), Interest::READABLE)
             .or_else(|_| {
                 self.poll.registry().reregister(
                     &mut info.lst,
diff --git a/actix-server/src/builder.rs b/actix-server/src/builder.rs
index f2f9aebb..ea7a4046 100644
--- a/actix-server/src/builder.rs
+++ b/actix-server/src/builder.rs
@@ -2,7 +2,7 @@ use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use std::time::Duration;
-use std::{io, mem, net};
+use std::{io, mem};
 
 use actix_rt::net::TcpStream;
 use actix_rt::time::{sleep_until, Instant};
@@ -13,14 +13,14 @@ use futures_util::future::ready;
 use futures_util::stream::FuturesUnordered;
 use futures_util::{ready, stream::Stream, FutureExt, StreamExt};
 use log::{error, info};
-use socket2::{Domain, Protocol, Socket, Type};
 
 use crate::accept::AcceptLoop;
 use crate::config::{ConfiguredService, ServiceConfig};
 use crate::server::{Server, ServerCommand};
 use crate::service::{InternalServiceFactory, ServiceFactory, StreamNewService};
 use crate::signals::{Signal, Signals};
-use crate::socket::StdListener;
+use crate::socket::{MioListener, StdSocketAddr, StdTcpListener, ToSocketAddrs};
+use crate::socket::{MioTcpListener, MioTcpSocket};
 use crate::waker_queue::{WakerInterest, WakerQueue};
 use crate::worker::{self, Worker, WorkerAvailability, WorkerHandle};
 use crate::Token;
@@ -29,10 +29,10 @@ use crate::Token;
 pub struct ServerBuilder {
     threads: usize,
     token: Token,
-    backlog: i32,
+    backlog: u32,
     workers: Vec<(usize, WorkerHandle)>,
     services: Vec<Box<dyn InternalServiceFactory>>,
-    sockets: Vec<(Token, String, StdListener)>,
+    sockets: Vec<(Token, String, MioListener)>,
     accept: AcceptLoop,
     exit: bool,
     shutdown_timeout: Duration,
@@ -91,7 +91,7 @@ impl ServerBuilder {
     /// Generally set in the 64-2048 range. Default value is 2048.
     ///
     /// This method should be called before `bind()` method call.
-    pub fn backlog(mut self, num: i32) -> Self {
+    pub fn backlog(mut self, num: u32) -> Self {
         self.backlog = num;
         self
     }
@@ -149,7 +149,7 @@ impl ServerBuilder {
             for (name, lst) in cfg.services {
                 let token = self.token.next();
                 srv.stream(token, name.clone(), lst.local_addr()?);
-                self.sockets.push((token, name, StdListener::Tcp(lst)));
+                self.sockets.push((token, name, MioListener::Tcp(lst)));
             }
             self.services.push(Box::new(srv));
         }
@@ -162,7 +162,7 @@ impl ServerBuilder {
     pub fn bind<F, U, N: AsRef<str>>(mut self, name: N, addr: U, factory: F) -> io::Result<Self>
     where
         F: ServiceFactory<TcpStream>,
-        U: net::ToSocketAddrs,
+        U: ToSocketAddrs,
     {
         let sockets = bind_addr(addr, self.backlog)?;
 
@@ -175,12 +175,12 @@ impl ServerBuilder {
                 lst.local_addr()?,
             ));
             self.sockets
-                .push((token, name.as_ref().to_string(), StdListener::Tcp(lst)));
+                .push((token, name.as_ref().to_string(), MioListener::Tcp(lst)));
         }
         Ok(self)
     }
 
-    #[cfg(all(unix))]
+    #[cfg(unix)]
     /// Add new unix domain service to the server.
     pub fn bind_uds<F, U, N>(self, name: N, addr: U, factory: F) -> io::Result<Self>
     where
@@ -188,8 +188,6 @@ impl ServerBuilder {
         N: AsRef<str>,
         U: AsRef<std::path::Path>,
     {
-        use std::os::unix::net::UnixListener;
-
         // The path must not exist when we try to bind.
         // Try to remove it to avoid bind error.
         if let Err(e) = std::fs::remove_file(addr.as_ref()) {
@@ -199,7 +197,7 @@ impl ServerBuilder {
             }
         }
 
-        let lst = UnixListener::bind(addr)?;
+        let lst = crate::socket::StdUnixListener::bind(addr)?;
         self.listen_uds(name, lst, factory)
     }
 
@@ -210,15 +208,15 @@ impl ServerBuilder {
     pub fn listen_uds<F, N: AsRef<str>>(
         mut self,
         name: N,
-        lst: std::os::unix::net::UnixListener,
+        lst: crate::socket::StdUnixListener,
         factory: F,
     ) -> io::Result<Self>
     where
         F: ServiceFactory<actix_rt::net::UnixStream>,
     {
-        use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+        use std::net::{IpAddr, Ipv4Addr};
         let token = self.token.next();
-        let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
+        let addr = StdSocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
         self.services.push(StreamNewService::create(
             name.as_ref().to_string(),
             token,
@@ -226,7 +224,7 @@ impl ServerBuilder {
             addr,
         ));
         self.sockets
-            .push((token, name.as_ref().to_string(), StdListener::Uds(lst)));
+            .push((token, name.as_ref().to_string(), MioListener::from(lst)));
         Ok(self)
     }
 
@@ -234,7 +232,7 @@ impl ServerBuilder {
     pub fn listen<F, N: AsRef<str>>(
         mut self,
         name: N,
-        lst: net::TcpListener,
+        lst: StdTcpListener,
         factory: F,
     ) -> io::Result<Self>
     where
@@ -247,8 +245,9 @@ impl ServerBuilder {
             factory,
             lst.local_addr()?,
         ));
+
         self.sockets
-            .push((token, name.as_ref().to_string(), StdListener::Tcp(lst)));
+            .push((token, name.as_ref().to_string(), MioListener::from(lst)));
         Ok(self)
     }
 
@@ -450,10 +449,10 @@ impl Future for ServerBuilder {
     }
 }
 
-pub(super) fn bind_addr<S: net::ToSocketAddrs>(
+pub(super) fn bind_addr<S: ToSocketAddrs>(
     addr: S,
-    backlog: i32,
-) -> io::Result<Vec<net::TcpListener>> {
+    backlog: u32,
+) -> io::Result<Vec<MioTcpListener>> {
     let mut err = None;
     let mut succ = false;
     let mut sockets = Vec::new();
@@ -481,14 +480,13 @@ pub(super) fn bind_addr<S: net::ToSocketAddrs>(
     }
 }
 
-fn create_tcp_listener(addr: net::SocketAddr, backlog: i32) -> io::Result<net::TcpListener> {
-    let domain = match addr {
-        net::SocketAddr::V4(_) => Domain::ipv4(),
-        net::SocketAddr::V6(_) => Domain::ipv6(),
+fn create_tcp_listener(addr: StdSocketAddr, backlog: u32) -> io::Result<MioTcpListener> {
+    let socket = match addr {
+        StdSocketAddr::V4(_) => MioTcpSocket::new_v4()?,
+        StdSocketAddr::V6(_) => MioTcpSocket::new_v6()?,
     };
-    let socket = Socket::new(domain, Type::stream(), Some(Protocol::tcp()))?;
-    socket.set_reuse_address(true)?;
-    socket.bind(&addr.into())?;
-    socket.listen(backlog)?;
-    Ok(socket.into_tcp_listener())
+
+    socket.set_reuseaddr(true)?;
+    socket.bind(addr)?;
+    socket.listen(backlog)
 }
diff --git a/actix-server/src/config.rs b/actix-server/src/config.rs
index 1c10e51f..6087efa9 100644
--- a/actix-server/src/config.rs
+++ b/actix-server/src/config.rs
@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 use std::future::Future;
-use std::{fmt, io, net};
+use std::{fmt, io};
 
 use actix_rt::net::TcpStream;
 use actix_service as actix;
@@ -12,18 +12,19 @@ use crate::builder::bind_addr;
 use crate::service::{
     BoxedServerService, InternalServiceFactory, ServerMessage, StreamService,
 };
+use crate::socket::{MioTcpListener, StdSocketAddr, StdTcpListener, ToSocketAddrs};
 use crate::LocalBoxFuture;
 use crate::Token;
 
 pub struct ServiceConfig {
-    pub(crate) services: Vec<(String, net::TcpListener)>,
+    pub(crate) services: Vec<(String, MioTcpListener)>,
     pub(crate) apply: Option<Box<dyn ServiceRuntimeConfiguration>>,
     pub(crate) threads: usize,
-    pub(crate) backlog: i32,
+    pub(crate) backlog: u32,
 }
 
 impl ServiceConfig {
-    pub(super) fn new(threads: usize, backlog: i32) -> ServiceConfig {
+    pub(super) fn new(threads: usize, backlog: u32) -> ServiceConfig {
         ServiceConfig {
             threads,
             backlog,
@@ -43,19 +44,23 @@ impl ServiceConfig {
     /// Add new service to server
     pub fn bind<U, N: AsRef<str>>(&mut self, name: N, addr: U) -> io::Result<&mut Self>
     where
-        U: net::ToSocketAddrs,
+        U: ToSocketAddrs,
     {
         let sockets = bind_addr(addr, self.backlog)?;
 
         for lst in sockets {
-            self.listen(name.as_ref(), lst);
+            self._listen(name.as_ref(), lst);
         }
 
         Ok(self)
     }
 
     /// Add new service to server
-    pub fn listen<N: AsRef<str>>(&mut self, name: N, lst: net::TcpListener) -> &mut Self {
+    pub fn listen<N: AsRef<str>>(&mut self, name: N, lst: StdTcpListener) -> &mut Self {
+        self._listen(name, MioTcpListener::from_std(lst))
+    }
+
+    fn _listen<N: AsRef<str>>(&mut self, name: N, lst: MioTcpListener) -> &mut Self {
         if self.apply.is_none() {
             self.apply = Some(Box::new(not_configured));
         }
@@ -76,7 +81,7 @@ impl ServiceConfig {
 
 pub(super) struct ConfiguredService {
     rt: Box<dyn ServiceRuntimeConfiguration>,
-    names: HashMap<Token, (String, net::SocketAddr)>,
+    names: HashMap<Token, (String, StdSocketAddr)>,
     topics: HashMap<String, Token>,
     services: Vec<Token>,
 }
@@ -91,7 +96,7 @@ impl ConfiguredService {
         }
     }
 
-    pub(super) fn stream(&mut self, token: Token, name: String, addr: net::SocketAddr) {
+    pub(super) fn stream(&mut self, token: Token, name: String, addr: StdSocketAddr) {
         self.names.insert(token, (name.clone(), addr));
         self.topics.insert(name, token);
         self.services.push(token);
diff --git a/actix-server/src/socket.rs b/actix-server/src/socket.rs
index 640288f4..d9c61c75 100644
--- a/actix-server/src/socket.rs
+++ b/actix-server/src/socket.rs
@@ -1,143 +1,64 @@
-use std::net::{SocketAddr as StdTcpSocketAddr, TcpListener as StdTcpListener};
+pub(crate) use std::net::{
+    SocketAddr as StdSocketAddr, TcpListener as StdTcpListener, ToSocketAddrs,
+};
+
+pub(crate) use mio::net::{TcpListener as MioTcpListener, TcpSocket as MioTcpSocket};
+
+#[cfg(unix)]
+pub(crate) use {
+    mio::net::UnixListener as MioUnixListener,
+    std::os::unix::net::UnixListener as StdUnixListener,
+};
+
 use std::{fmt, io};
 
-#[cfg(unix)]
-use std::os::unix::{
-    io::{FromRawFd, IntoRawFd},
-    net::{SocketAddr as StdUdsSocketAddr, UnixListener as StdUnixListener},
-};
+use actix_rt::net::TcpStream;
+use mio::event::Source;
+use mio::net::TcpStream as MioTcpStream;
+use mio::{Interest, Registry, Token};
+
 #[cfg(windows)]
 use std::os::windows::io::{FromRawSocket, IntoRawSocket};
-
-use actix_rt::net::TcpStream;
 #[cfg(unix)]
-use actix_rt::net::UnixStream;
-use mio::event::Source;
-#[cfg(unix)]
-use mio::net::{
-    SocketAddr as MioSocketAddr, UnixListener as MioUnixListener, UnixStream as MioUnixStream,
+use {
+    actix_rt::net::UnixStream,
+    mio::net::{SocketAddr as MioSocketAddr, UnixStream as MioUnixStream},
+    std::os::unix::io::{FromRawFd, IntoRawFd},
 };
-use mio::net::{TcpListener as MioTcpListener, TcpStream as MioTcpStream};
-use mio::{Interest, Registry, Token};
 
 /// socket module contains a unified wrapper for Tcp/Uds listener/SocketAddr/Stream and necessary
 /// trait impl for registering the listener to mio::Poll and convert stream to
 /// `actix_rt::net::{TcpStream, UnixStream}`.
 
-pub(crate) enum StdListener {
-    Tcp(StdTcpListener),
-    #[cfg(unix)]
-    Uds(StdUnixListener),
-}
-
-impl fmt::Debug for StdListener {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            StdListener::Tcp(ref lst) => write!(f, "{:?}", lst),
-            #[cfg(all(unix))]
-            StdListener::Uds(ref lst) => write!(f, "{:?}", lst),
-        }
-    }
-}
-
-impl fmt::Display for StdListener {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            StdListener::Tcp(ref lst) => write!(f, "{}", lst.local_addr().ok().unwrap()),
-            #[cfg(unix)]
-            StdListener::Uds(ref lst) => write!(f, "{:?}", lst.local_addr().ok().unwrap()),
-        }
-    }
-}
-
-pub(crate) enum SocketAddr {
-    Tcp(StdTcpSocketAddr),
-    #[cfg(unix)]
-    Uds(StdUdsSocketAddr),
-    // this is a work around. mio would return different types of SocketAddr between accept and
-    // local_addr methods.
-    #[cfg(unix)]
-    UdsMio(MioSocketAddr),
-}
-
-impl fmt::Display for SocketAddr {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            SocketAddr::Tcp(ref addr) => write!(f, "{}", addr),
-            #[cfg(unix)]
-            SocketAddr::Uds(ref addr) => write!(f, "{:?}", addr),
-            #[cfg(unix)]
-            SocketAddr::UdsMio(ref addr) => write!(f, "{:?}", addr),
-        }
-    }
-}
-
-impl fmt::Debug for SocketAddr {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
-            SocketAddr::Tcp(ref addr) => write!(f, "{:?}", addr),
-            #[cfg(unix)]
-            SocketAddr::Uds(ref addr) => write!(f, "{:?}", addr),
-            #[cfg(unix)]
-            SocketAddr::UdsMio(ref addr) => write!(f, "{:?}", addr),
-        }
-    }
-}
-
-impl StdListener {
-    pub(crate) fn local_addr(&self) -> SocketAddr {
-        match self {
-            StdListener::Tcp(lst) => SocketAddr::Tcp(lst.local_addr().unwrap()),
-            #[cfg(unix)]
-            StdListener::Uds(lst) => SocketAddr::Uds(lst.local_addr().unwrap()),
-        }
-    }
-
-    pub(crate) fn into_mio_listener(self) -> std::io::Result<MioSocketListener> {
-        match self {
-            StdListener::Tcp(lst) => {
-                // ToDo: is this non_blocking a good practice?
-                lst.set_nonblocking(true)?;
-                Ok(MioSocketListener::Tcp(MioTcpListener::from_std(lst)))
-            }
-            #[cfg(unix)]
-            StdListener::Uds(lst) => {
-                // ToDo: the same as above
-                lst.set_nonblocking(true)?;
-                Ok(MioSocketListener::Uds(MioUnixListener::from_std(lst)))
-            }
-        }
-    }
-}
-
-#[derive(Debug)]
-pub enum MioStream {
-    Tcp(MioTcpStream),
-    #[cfg(unix)]
-    Uds(MioUnixStream),
-}
-
-pub(crate) enum MioSocketListener {
+pub(crate) enum MioListener {
     Tcp(MioTcpListener),
     #[cfg(unix)]
     Uds(MioUnixListener),
 }
 
-impl MioSocketListener {
+impl MioListener {
+    pub(crate) fn local_addr(&self) -> SocketAddr {
+        match *self {
+            MioListener::Tcp(ref lst) => SocketAddr::Tcp(lst.local_addr().unwrap()),
+            #[cfg(unix)]
+            MioListener::Uds(ref lst) => SocketAddr::Uds(lst.local_addr().unwrap()),
+        }
+    }
+
     pub(crate) fn accept(&self) -> io::Result<Option<(MioStream, SocketAddr)>> {
         match *self {
-            MioSocketListener::Tcp(ref lst) => lst
+            MioListener::Tcp(ref lst) => lst
                 .accept()
                 .map(|(stream, addr)| Some((MioStream::Tcp(stream), SocketAddr::Tcp(addr)))),
             #[cfg(unix)]
-            MioSocketListener::Uds(ref lst) => lst
+            MioListener::Uds(ref lst) => lst
                 .accept()
-                .map(|(stream, addr)| Some((MioStream::Uds(stream), SocketAddr::UdsMio(addr)))),
+                .map(|(stream, addr)| Some((MioStream::Uds(stream), SocketAddr::Uds(addr)))),
         }
     }
 }
 
-impl Source for MioSocketListener {
+impl Source for MioListener {
     fn register(
         &mut self,
         registry: &Registry,
@@ -145,9 +66,9 @@ impl Source for MioSocketListener {
         interests: Interest,
     ) -> io::Result<()> {
         match *self {
-            MioSocketListener::Tcp(ref mut lst) => lst.register(registry, token, interests),
+            MioListener::Tcp(ref mut lst) => lst.register(registry, token, interests),
             #[cfg(unix)]
-            MioSocketListener::Uds(ref mut lst) => lst.register(registry, token, interests),
+            MioListener::Uds(ref mut lst) => lst.register(registry, token, interests),
         }
     }
 
@@ -158,17 +79,17 @@ impl Source for MioSocketListener {
         interests: Interest,
     ) -> io::Result<()> {
         match *self {
-            MioSocketListener::Tcp(ref mut lst) => lst.reregister(registry, token, interests),
+            MioListener::Tcp(ref mut lst) => lst.reregister(registry, token, interests),
             #[cfg(unix)]
-            MioSocketListener::Uds(ref mut lst) => lst.reregister(registry, token, interests),
+            MioListener::Uds(ref mut lst) => lst.reregister(registry, token, interests),
         }
     }
 
     fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
         match *self {
-            MioSocketListener::Tcp(ref mut lst) => lst.deregister(registry),
+            MioListener::Tcp(ref mut lst) => lst.deregister(registry),
             #[cfg(unix)]
-            MioSocketListener::Uds(ref mut lst) => {
+            MioListener::Uds(ref mut lst) => {
                 let res = lst.deregister(registry);
 
                 // cleanup file path
@@ -183,6 +104,72 @@ impl Source for MioSocketListener {
     }
 }
 
+impl From<StdTcpListener> for MioListener {
+    fn from(lst: StdTcpListener) -> Self {
+        MioListener::Tcp(MioTcpListener::from_std(lst))
+    }
+}
+
+#[cfg(unix)]
+impl From<StdUnixListener> for MioListener {
+    fn from(lst: StdUnixListener) -> Self {
+        MioListener::Uds(MioUnixListener::from_std(lst))
+    }
+}
+
+impl fmt::Debug for MioListener {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            MioListener::Tcp(ref lst) => write!(f, "{:?}", lst),
+            #[cfg(all(unix))]
+            MioListener::Uds(ref lst) => write!(f, "{:?}", lst),
+        }
+    }
+}
+
+impl fmt::Display for MioListener {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            MioListener::Tcp(ref lst) => write!(f, "{}", lst.local_addr().ok().unwrap()),
+            #[cfg(unix)]
+            MioListener::Uds(ref lst) => write!(f, "{:?}", lst.local_addr().ok().unwrap()),
+        }
+    }
+}
+
+pub(crate) enum SocketAddr {
+    Tcp(StdSocketAddr),
+    #[cfg(unix)]
+    Uds(MioSocketAddr),
+}
+
+impl fmt::Display for SocketAddr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            SocketAddr::Tcp(ref addr) => write!(f, "{}", addr),
+            #[cfg(unix)]
+            SocketAddr::Uds(ref addr) => write!(f, "{:?}", addr),
+        }
+    }
+}
+
+impl fmt::Debug for SocketAddr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            SocketAddr::Tcp(ref addr) => write!(f, "{:?}", addr),
+            #[cfg(unix)]
+            SocketAddr::Uds(ref addr) => write!(f, "{:?}", addr),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum MioStream {
+    Tcp(MioTcpStream),
+    #[cfg(unix)]
+    Uds(MioUnixStream),
+}
+
 /// helper trait for converting mio stream to tokio stream.
 pub trait FromStream: Sized {
     fn from_mio(sock: MioStream) -> io::Result<Self>;
@@ -243,18 +230,16 @@ mod tests {
 
     #[test]
     fn socket_addr() {
-        use socket2::{Domain, SockAddr, Socket, Type};
-
         let addr = SocketAddr::Tcp("127.0.0.1:8080".parse().unwrap());
         assert!(format!("{:?}", addr).contains("127.0.0.1:8080"));
         assert_eq!(format!("{}", addr), "127.0.0.1:8080");
 
-        let addr: StdTcpSocketAddr = "127.0.0.1:0".parse().unwrap();
-        let socket = Socket::new(Domain::ipv4(), Type::stream(), None).unwrap();
-        socket.set_reuse_address(true).unwrap();
-        socket.bind(&SockAddr::from(addr)).unwrap();
-        let tcp = socket.into_tcp_listener();
-        let lst = StdListener::Tcp(tcp);
+        let addr: StdSocketAddr = "127.0.0.1:0".parse().unwrap();
+        let socket = mio::net::TcpSocket::new_v4().unwrap();
+        socket.set_reuseaddr(true).unwrap();
+        socket.bind(addr).unwrap();
+        let tcp = socket.listen(128).unwrap();
+        let lst = MioListener::Tcp(tcp);
         assert!(format!("{:?}", lst).contains("TcpListener"));
         assert!(format!("{}", lst).contains("127.0.0.1"));
     }
@@ -263,13 +248,13 @@ mod tests {
     #[cfg(unix)]
     fn uds() {
         let _ = std::fs::remove_file("/tmp/sock.xxxxx");
-        if let Ok(socket) = StdUnixListener::bind("/tmp/sock.xxxxx") {
+        if let Ok(socket) = MioUnixListener::bind("/tmp/sock.xxxxx") {
             let addr = socket.local_addr().expect("Couldn't get local address");
             let a = SocketAddr::Uds(addr);
             assert!(format!("{:?}", a).contains("/tmp/sock.xxxxx"));
             assert!(format!("{}", a).contains("/tmp/sock.xxxxx"));
 
-            let lst = StdListener::Uds(socket);
+            let lst = MioListener::Uds(socket);
             assert!(format!("{:?}", lst).contains("/tmp/sock.xxxxx"));
             assert!(format!("{}", lst).contains("/tmp/sock.xxxxx"));
         }
diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index ec88e0e5..05e383f8 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -199,8 +199,7 @@ impl Worker {
                 .collect::<Vec<_>>();
 
             spawn(async move {
-                let res = join_all(fut).await;
-                let res: Result<Vec<_>, _> = res.into_iter().collect();
+                let res: Result<Vec<_>, _> = join_all(fut).await.into_iter().collect();
                 match res {
                     Ok(services) => {
                         for item in services {
diff --git a/actix-server/tests/test_server.rs b/actix-server/tests/test_server.rs
index de4e2262..b3ade4e1 100644
--- a/actix-server/tests/test_server.rs
+++ b/actix-server/tests/test_server.rs
@@ -5,14 +5,13 @@ use std::{net, thread, time};
 use actix_server::Server;
 use actix_service::fn_service;
 use futures_util::future::{lazy, ok};
-use socket2::{Domain, Protocol, Socket, Type};
 
 fn unused_addr() -> net::SocketAddr {
     let addr: net::SocketAddr = "127.0.0.1:0".parse().unwrap();
-    let socket = Socket::new(Domain::ipv4(), Type::stream(), Some(Protocol::tcp())).unwrap();
-    socket.bind(&addr.into()).unwrap();
-    socket.set_reuse_address(true).unwrap();
-    let tcp = socket.into_tcp_listener();
+    let socket = mio::net::TcpSocket::new_v4().unwrap();
+    socket.bind(addr).unwrap();
+    socket.set_reuseaddr(true).unwrap();
+    let tcp = socket.listen(32).unwrap();
     tcp.local_addr().unwrap()
 }
 
diff --git a/actix-tls/CHANGES.md b/actix-tls/CHANGES.md
index 592b96b0..99795c91 100644
--- a/actix-tls/CHANGES.md
+++ b/actix-tls/CHANGES.md
@@ -1,7 +1,9 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
-
+* move from `tokio-tls` to `tokio-native-tls` for native-tls feature.
+* Update `tokio-openssl` dependency to 0.5.0
+* Update `tokio-rustls` dependency to 0.20.0
 
 ## 2.0.0 - 2020-09-03
 * `nativetls::NativeTlsAcceptor` is renamed to `nativetls::Acceptor`.
diff --git a/actix-tls/Cargo.toml b/actix-tls/Cargo.toml
index 801f6144..6e6de84e 100644
--- a/actix-tls/Cargo.toml
+++ b/actix-tls/Cargo.toml
@@ -32,7 +32,7 @@ openssl = ["open-ssl", "tokio-openssl"]
 rustls = ["rust-tls", "webpki", "webpki-roots", "tokio-rustls"]
 
 # nativetls
-nativetls = ["native-tls", "tokio-tls"]
+nativetls = ["native-tls", "tokio-native-tls"]
 
 [dependencies]
 actix-service = "1.0.0"
@@ -43,20 +43,20 @@ futures-util = { version = "0.3.4", default-features = false }
 
 # openssl
 open-ssl = { package = "openssl", version = "0.10", optional = true }
-tokio-openssl = { version = "0.4.0", optional = true }
+tokio-openssl = { version = "0.5.0", optional = true }
 
 # rustls
 rust-tls = { package = "rustls", version = "0.18.0", optional = true }
 webpki = { version = "0.21", optional = true }
 webpki-roots = { version = "0.20", optional = true }
-tokio-rustls = { version = "0.14.0", optional = true }
+tokio-rustls = { version = "0.20.0", optional = true }
 
 # native-tls
 native-tls = { version = "0.2", optional = true }
-tokio-tls = { version = "0.3", optional = true }
+tokio-native-tls = { version = "0.2.0", optional = true }
 
 [dev-dependencies]
-bytes = "0.5"
+bytes = "0.6"
 log = "0.4"
 env_logger = "0.7"
 actix-testing = "1.0.0"
diff --git a/actix-tls/src/nativetls.rs b/actix-tls/src/nativetls.rs
index fa66bff6..eb7e268b 100644
--- a/actix-tls/src/nativetls.rs
+++ b/actix-tls/src/nativetls.rs
@@ -7,7 +7,7 @@ use actix_utils::counter::Counter;
 use futures_util::future::{self, FutureExt, LocalBoxFuture, TryFutureExt};
 
 pub use native_tls::Error;
-pub use tokio_tls::{TlsAcceptor, TlsStream};
+pub use tokio_native_tls::{TlsAcceptor, TlsStream};
 
 use crate::MAX_CONN_COUNTER;
 
diff --git a/actix-utils/CHANGES.md b/actix-utils/CHANGES.md
index fe7aca31..032fa778 100644
--- a/actix-utils/CHANGES.md
+++ b/actix-utils/CHANGES.md
@@ -1,6 +1,7 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
+* Update `bytes` to 0.6
 
 ## 2.0.0 - 2020-08-23
 * No changes from beta 1.
diff --git a/actix-utils/Cargo.toml b/actix-utils/Cargo.toml
index e253545a..e9e3d3ba 100644
--- a/actix-utils/Cargo.toml
+++ b/actix-utils/Cargo.toml
@@ -20,7 +20,7 @@ actix-codec = "0.3.0"
 actix-rt = "1.1.1"
 actix-service = "1.0.6"
 bitflags = "1.2.1"
-bytes = "0.5.3"
+bytes = "0.6"
 either = "1.5.3"
 futures-channel = { version = "0.3.4", default-features = false }
 futures-sink = { version = "0.3.4", default-features = false }
diff --git a/string/Cargo.toml b/string/Cargo.toml
index 3653fe58..99085072 100644
--- a/string/Cargo.toml
+++ b/string/Cargo.toml
@@ -15,7 +15,7 @@ name = "bytestring"
 path = "src/lib.rs"
 
 [dependencies]
-bytes = "0.5.3"
+bytes = "0.6"
 serde = { version = "1.0", optional = true }
 
 [dev-dependencies]