diff --git a/opam-repo-ci-web.opam b/opam-repo-ci-web.opam
index b06a771b..0268fcc5 100644
--- a/opam-repo-ci-web.opam
+++ b/opam-repo-ci-web.opam
@@ -29,7 +29,7 @@ depends: [
   "prometheus-app"
   "cmdliner" {>= "1.1.0"}
   "lwt"
-  "cohttp-lwt-unix" {>= "2.2.0"}
+  "cohttp-lwt-unix" {>= "6.0.0"}
   "mirage-crypto-rng" {>= "0.11.0"}
   "tyxml"
   "capnp-rpc-unix"
diff --git a/web-ui/github.ml b/web-ui/github.ml
index 03ee51fe..609d3dc5 100644
--- a/web-ui/github.ml
+++ b/web-ui/github.ml
@@ -283,10 +283,9 @@ module Repo_handle = struct
         (* Otherwise, an nginx reverse proxy will wait for the whole log before sending anything. *)
         Cohttp.Header.init_with "X-Accel-Buffering" "no"
       in
-      let res = Cohttp.Response.make ~status:`OK ~flush:true ~encoding:Cohttp.Transfer.Chunked ~headers () in
+      let res = Cohttp.Response.make ~status:`OK ~encoding:Cohttp.Transfer.Chunked ~headers () in
       let write _ic oc =
-        let flush = Cohttp.Response.flush res in
-        let writer = Transfer_IO.make_writer ~flush Cohttp.Transfer.Chunked oc in
+        let writer = Transfer_IO.make_writer ~flush:true Cohttp.Transfer.Chunked oc in
         Lwt.finalize
           (fun () ->
              stream_logs job ~owner ~name ~refs ~hash ~variant ~status chunk writer >>= fun () ->