diff --git a/eio/io.ml b/eio/io.ml
index 8b0f59d..78a50c8 100644
--- a/eio/io.ml
+++ b/eio/io.ml
@@ -19,12 +19,8 @@ let int_value shift len v = (v lsr shift) land ((1 lsl len) - 1)
 
 (* Eio only uses Cstructs so we lose 0copy :(! *)
 let read_exactly src remaining =
-  let open Cohttp_eio.Server in
   try
-    Buf_read.ensure src remaining ;
-    let t = Some (Cstruct.to_string (Buf_read.peek src) ~off:0 ~len:remaining) in
-    Buf_read.consume src remaining ;
-    t
+    Some (Buf_read.take remaining src)
   with End_of_file -> None
 
 let read_uint16 ic =
@@ -38,7 +34,6 @@ let read_int64 ic =
   | Some s -> Some (Int64.to_int @@ EndianString.BigEndian.get_int64 s 0)
 
 let write_frame_to_buf ~mode buf fr =
-  let scratch = Bytes.create 8 in
   let open Frame in
   let content = Bytes.unsafe_of_string fr.content in
   let len = Bytes.length content in
@@ -54,16 +49,14 @@ let write_frame_to_buf ~mode buf fr =
   let hdr = set_bit hdr 7 (is_client mode) in
   let hdr = hdr lor payload_len in
   (* Payload len is guaranteed to fit in 7 bits *)
-  EndianBytes.BigEndian.set_int16 scratch 0 hdr ;
-  Buf_write.bytes ~off:0 ~len:2 buf scratch ;
+  Buf_write.BE.uint16 buf hdr;
   ( match len with
   | n when n < 126 -> ()
   | n when n < 1 lsl 16 ->
-      EndianBytes.BigEndian.set_int16 scratch 0 n ;
-      Buf_write.bytes ~off:0 ~len:2 buf scratch
+      Buf_write.BE.uint16 buf n
   | n ->
-      EndianBytes.BigEndian.set_int64 scratch 0 Int64.(of_int n) ;
-      Buf_write.bytes ~off:0 ~len:8 buf scratch ) ;
+      Buf_write.BE.uint64 buf Int64.(of_int n);
+  );
   ( match mode with
   | Server -> ()
   | Client random_string ->
@@ -73,9 +66,7 @@ let write_frame_to_buf ~mode buf fr =
   Buf_write.bytes buf content
 
 let close_with_code mode dst code =
-  Buf_write.flush dst ;
-  write_frame_to_buf ~mode dst @@ Frame.close code ;
-  Buf_write.flush dst
+  write_frame_to_buf ~mode dst @@ Frame.close code
 
 let read_frame ic oc mode hdr =
   let hdr_part1 = EndianString.BigEndian.get_int8 hdr 0 in
@@ -86,7 +77,6 @@ let read_frame ic oc mode hdr =
   let frame_masked = is_bit_set 7 hdr_part2 in
   let length = int_value 0 7 hdr_part2 in
   let opcode = Frame.Opcode.of_enum opcode in
-  Buf_write.flush oc ;
   let payload_len =
     match length with
     | i when i < 126 -> i
@@ -103,14 +93,12 @@ let read_frame ic oc mode hdr =
   else
     let mask =
       if frame_masked then (
-        Buf_write.flush oc ;
         match read_exactly ic 4 with
         | None -> proto_error "could not read mask"
         | Some mask -> mask )
       else String.empty in
     if payload_len = 0 then Frame.create ~opcode ~extension ~final ()
     else (
-      Buf_write.flush oc ;
       match read_exactly ic payload_len with
       | None -> proto_error "could not read payload (len=%d)" payload_len
       | Some payload ->
@@ -120,7 +108,6 @@ let read_frame ic oc mode hdr =
           frame )
 
 let make_read_frame ~mode ic oc () =
-  Buf_write.flush oc ;
   match read_exactly ic 2 with
   | None -> raise End_of_file
   | Some hdr -> read_frame ic oc mode hdr
@@ -136,24 +123,20 @@ module Connected_client = struct
 
   let source {endp; _} = endp
 
-  let create ?read_buf http_request endp ic oc =
+  let create http_request endp ic oc =
     let read_frame = make_read_frame ~mode:Server ic oc in
-    { buffer= oc;
+    { buffer = oc;
       endp;
       ic;
       http_request;
-      standard_frame_replies= false;
+      standard_frame_replies = false;
       read_frame }
 
   let send {buffer; _} frame =
-    Buf_write.flush buffer ;
-    write_frame_to_buf ~mode:Server buffer frame ;
-    Buf_write.flush buffer
+    write_frame_to_buf ~mode:Server buffer frame
 
   let send_multiple {buffer; _} frames =
-    Buf_write.flush buffer ;
-    List.iter (write_frame_to_buf ~mode:Server buffer) frames ;
-    Buf_write.flush buffer
+    List.iter (write_frame_to_buf ~mode:Server buffer) frames
 
   let standard_recv t =
     let fr = t.read_frame () in
diff --git a/websocket-eio.opam b/websocket-eio.opam
index cca7449..37a693a 100644
--- a/websocket-eio.opam
+++ b/websocket-eio.opam
@@ -46,3 +46,7 @@ build: [
   ["dune" "install" "-p" name "--create-install-files" name]
 ]
 dev-repo: "git+https://github.com/vbmithr/ocaml-websocket.git"
+pin-depends: [
+  [ "http.dev" "git+https://github.com/mirage/ocaml-cohttp#ce5f271b69fe42471ede858c5b8ce8203e3c14ad" ]
+  [ "cohttp-eio.dev" "git+https://github.com/mirage/ocaml-cohttp#ce5f271b69fe42471ede858c5b8ce8203e3c14ad" ]
+]
\ No newline at end of file