diff --git a/actix-server/Cargo.toml b/actix-server/Cargo.toml
index 8b6f92e2..18aa97d4 100755
--- a/actix-server/Cargo.toml
+++ b/actix-server/Cargo.toml
@@ -23,11 +23,10 @@ actix-service = "2.0.0-beta.5"
 actix-utils = "3.0.0-beta.4"
 
 futures-core = { version = "0.3.7", default-features = false, features = ["alloc"] }
-futures-util = { version = "0.3.7", default-features = false }
 log = "0.4"
-mio = { version = "0.7.11", features = ["os-poll", "net", "os-util"] }
+mio = { version = "0.7.11", features = ["os-poll", "net"] }
 num_cpus = "1.13"
-rtrb = ""
+rtrb = "0.1"
 slab = "0.4"
 tokio = { version = "1.2", features = ["sync"] }
 
diff --git a/actix-server/src/spsc.rs b/actix-server/src/spsc.rs
index fe6656ac..6de5a76b 100644
--- a/actix-server/src/spsc.rs
+++ b/actix-server/src/spsc.rs
@@ -3,7 +3,7 @@ use std::{
     task::{Context, Poll},
 };
 
-use futures_util::task::AtomicWaker;
+use futures_core::task::__internal::AtomicWaker;
 use rtrb::{Consumer, Producer, PushError, RingBuffer};
 
 pub fn channel<T>(cap: usize) -> (Sender<T>, Receiver<T>) {
@@ -52,3 +52,23 @@ impl<T> Receiver<T> {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use actix_utils::future::poll_fn;
+
+    #[actix_rt::test]
+    async fn test_send() {
+        let (mut tx, mut rx) = channel::<usize>(1);
+
+        let res = poll_fn(|cx| Poll::Ready(rx.poll_recv_unpin(cx))).await;
+        assert!(res.is_pending());
+
+        tx.send(996).unwrap();
+
+        let res = poll_fn(|cx| rx.poll_recv_unpin(cx)).await;
+        assert_eq!(res, 996);
+    }
+}
diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index 816aff33..e2f158e9 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -22,7 +22,7 @@ use tokio::sync::oneshot;
 
 use crate::service::{BoxedServerService, InternalServiceFactory};
 use crate::socket::MioStream;
-use crate::spsc::{channel, Receiver, Sender};
+use crate::spsc;
 use crate::waker_queue::{WakerInterest, WakerQueue};
 use crate::{join_all, Token};
 
@@ -41,17 +41,17 @@ pub(crate) struct Conn {
 
 fn handle_pair(
     idx: usize,
-    tx1: Sender<Conn>,
-    tx2: Sender<Stop>,
+    tx_accept: spsc::Sender<Conn>,
+    tx_server: spsc::Sender<Stop>,
     avail: WorkerAvailability,
 ) -> (WorkerHandleAccept, WorkerHandleServer) {
     let accept = WorkerHandleAccept {
         idx,
-        tx: tx1,
+        tx: tx_accept,
         avail,
     };
 
-    let server = WorkerHandleServer { idx, tx: tx2 };
+    let server = WorkerHandleServer { idx, tx: tx_server };
 
     (accept, server)
 }
@@ -62,7 +62,7 @@ fn handle_pair(
 /// Held by [Accept](crate::accept::Accept).
 pub(crate) struct WorkerHandleAccept {
     pub idx: usize,
-    tx: Sender<Conn>,
+    tx: spsc::Sender<Conn>,
     avail: WorkerAvailability,
 }
 
@@ -81,7 +81,7 @@ impl WorkerHandleAccept {
 /// Held by [ServerBuilder](crate::builder::ServerBuilder).
 pub(crate) struct WorkerHandleServer {
     pub idx: usize,
-    tx: Sender<Stop>,
+    tx: spsc::Sender<Stop>,
 }
 
 impl WorkerHandleServer {
@@ -123,8 +123,8 @@ impl WorkerAvailability {
 ///
 /// Worker accepts Socket objects via unbounded channel and starts stream processing.
 pub(crate) struct ServerWorker {
-    rx: Receiver<Conn>,
-    rx2: Receiver<Stop>,
+    rx_accept: spsc::Receiver<Conn>,
+    rx_server: spsc::Receiver<Stop>,
     services: Vec<WorkerService>,
     availability: WorkerAvailability,
     conns: Counter,
@@ -198,8 +198,8 @@ impl ServerWorker {
         availability: WorkerAvailability,
         config: ServerWorkerConfig,
     ) -> (WorkerHandleAccept, WorkerHandleServer) {
-        let (tx1, rx) = channel(backlog as _);
-        let (tx2, rx2) = channel(1);
+        let (tx_accept, rx_accept) = spsc::channel(backlog as _);
+        let (tx_server, rx_server) = spsc::channel(1);
         let avail = availability.clone();
 
         // every worker runs in it's own arbiter.
@@ -214,8 +214,8 @@ impl ServerWorker {
         .spawn(async move {
             availability.set(false);
             let mut wrk = ServerWorker {
-                rx,
-                rx2,
+                rx_accept,
+                rx_server,
                 services: Vec::new(),
                 availability,
                 conns: Counter::new(config.max_concurrent_connections),
@@ -264,7 +264,7 @@ impl ServerWorker {
             });
         });
 
-        handle_pair(idx, tx1, tx2, avail)
+        handle_pair(idx, tx_accept, tx_server, avail)
     }
 
     fn restart_service(&mut self, token: Token, factory_id: usize) {
@@ -370,7 +370,7 @@ impl Future for ServerWorker {
         let this = self.as_mut().get_mut();
 
         // `StopWorker` message handler
-        if let Poll::Ready(Stop { graceful, tx }) = this.rx2.poll_recv_unpin(cx) {
+        if let Poll::Ready(Stop { graceful, tx }) = this.rx_server.poll_recv_unpin(cx) {
             this.availability.set(false);
             let num = this.conns.total();
             if num == 0 {
@@ -465,7 +465,7 @@ impl Future for ServerWorker {
             WorkerState::Available => loop {
                 match this.check_readiness(cx) {
                     Ok(true) => {
-                        let msg = ready!(this.rx.poll_recv_unpin(cx));
+                        let msg = ready!(this.rx_accept.poll_recv_unpin(cx));
                         // handle incoming io stream
                         let guard = this.conns.get();
                         let _ = this.services[msg.token.0].service.call((guard, msg.io));