diff --git a/ext/fetch/README.md b/ext/fetch/README.md
index d088a6147c..3af8110a6f 100644
--- a/ext/fetch/README.md
+++ b/ext/fetch/README.md
@@ -78,6 +78,5 @@ Following ops are provided, which can be accessed through `Deno.ops`:
 
 - op_fetch
 - op_fetch_send
-- op_fetch_response_upgrade
 - op_utf8_to_byte_string
 - op_fetch_custom_client
diff --git a/ext/fetch/lib.rs b/ext/fetch/lib.rs
index a3f9eeb4fb..79659771e6 100644
--- a/ext/fetch/lib.rs
+++ b/ext/fetch/lib.rs
@@ -28,7 +28,6 @@ use deno_core::futures::Stream;
 use deno_core::futures::StreamExt;
 use deno_core::futures::TryFutureExt;
 use deno_core::op2;
-use deno_core::unsync::spawn;
 use deno_core::url::Url;
 use deno_core::AsyncRefCell;
 use deno_core::AsyncResult;
@@ -70,12 +69,9 @@ use hyper::body::Frame;
 use hyper_util::client::legacy::connect::HttpConnector;
 use hyper_util::client::legacy::connect::HttpInfo;
 use hyper_util::rt::TokioExecutor;
-use hyper_util::rt::TokioIo;
 use hyper_util::rt::TokioTimer;
 use serde::Deserialize;
 use serde::Serialize;
-use tokio::io::AsyncReadExt;
-use tokio::io::AsyncWriteExt;
 use tower::ServiceExt;
 use tower_http::decompression::Decompression;
 
@@ -127,7 +123,6 @@ deno_core::extension!(deno_fetch,
   ops = [
     op_fetch<FP>,
     op_fetch_send,
-    op_fetch_response_upgrade,
     op_utf8_to_byte_string,
     op_fetch_custom_client<FP>,
   ],
@@ -627,114 +622,6 @@ pub async fn op_fetch_send(
   })
 }
 
-#[op2(async)]
-#[smi]
-pub async fn op_fetch_response_upgrade(
-  state: Rc<RefCell<OpState>>,
-  #[smi] rid: ResourceId,
-) -> Result<ResourceId, AnyError> {
-  let raw_response = state
-    .borrow_mut()
-    .resource_table
-    .take::<FetchResponseResource>(rid)?;
-  let raw_response = Rc::try_unwrap(raw_response)
-    .expect("Someone is holding onto FetchResponseResource");
-
-  let (read, write) = tokio::io::duplex(1024);
-  let (read_rx, write_tx) = tokio::io::split(read);
-  let (mut write_rx, mut read_tx) = tokio::io::split(write);
-  let upgraded = raw_response.upgrade().await?;
-  {
-    // Stage 3: Pump the data
-    let (mut upgraded_rx, mut upgraded_tx) =
-      tokio::io::split(TokioIo::new(upgraded));
-
-    spawn(async move {
-      let mut buf = [0; 1024];
-      loop {
-        let read = upgraded_rx.read(&mut buf).await?;
-        if read == 0 {
-          break;
-        }
-        read_tx.write_all(&buf[..read]).await?;
-      }
-      Ok::<_, AnyError>(())
-    });
-    spawn(async move {
-      let mut buf = [0; 1024];
-      loop {
-        let read = write_rx.read(&mut buf).await?;
-        if read == 0 {
-          break;
-        }
-        upgraded_tx.write_all(&buf[..read]).await?;
-      }
-      Ok::<_, AnyError>(())
-    });
-  }
-
-  Ok(
-    state
-      .borrow_mut()
-      .resource_table
-      .add(UpgradeStream::new(read_rx, write_tx)),
-  )
-}
-
-struct UpgradeStream {
-  read: AsyncRefCell<tokio::io::ReadHalf<tokio::io::DuplexStream>>,
-  write: AsyncRefCell<tokio::io::WriteHalf<tokio::io::DuplexStream>>,
-  cancel_handle: CancelHandle,
-}
-
-impl UpgradeStream {
-  pub fn new(
-    read: tokio::io::ReadHalf<tokio::io::DuplexStream>,
-    write: tokio::io::WriteHalf<tokio::io::DuplexStream>,
-  ) -> Self {
-    Self {
-      read: AsyncRefCell::new(read),
-      write: AsyncRefCell::new(write),
-      cancel_handle: CancelHandle::new(),
-    }
-  }
-
-  async fn read(self: Rc<Self>, buf: &mut [u8]) -> Result<usize, AnyError> {
-    let cancel_handle = RcRef::map(self.clone(), |this| &this.cancel_handle);
-    async {
-      let read = RcRef::map(self, |this| &this.read);
-      let mut read = read.borrow_mut().await;
-      Ok(Pin::new(&mut *read).read(buf).await?)
-    }
-    .try_or_cancel(cancel_handle)
-    .await
-  }
-
-  async fn write(self: Rc<Self>, buf: &[u8]) -> Result<usize, AnyError> {
-    let cancel_handle = RcRef::map(self.clone(), |this| &this.cancel_handle);
-    async {
-      let write = RcRef::map(self, |this| &this.write);
-      let mut write = write.borrow_mut().await;
-      Ok(Pin::new(&mut *write).write(buf).await?)
-    }
-    .try_or_cancel(cancel_handle)
-    .await
-  }
-}
-
-impl Resource for UpgradeStream {
-  fn name(&self) -> Cow<str> {
-    "fetchUpgradedStream".into()
-  }
-
-  deno_core::impl_readable_byob!();
-  deno_core::impl_writable!();
-
-  fn close(self: Rc<Self>) {
-    self.cancel_handle.cancel();
-  }
-}
-
 type CancelableResponseResult =
   Result<Result<http::Response<ResBody>, AnyError>, Canceled>;