diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 411be6b98238ce59994709f63334926d0c3a6ea1..77d6b2ed48532e29f7f6498884aab9bf1f3a9f64 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -35,7 +35,7 @@ variables:
   # /!\ CI_REGISTRY is overriden to use a private Docker registry mirror in AWS ECR
   # in GitLab namespaces `nomadic-labs` and `tezos`
   ## This value MUST be the same as `opam_repository_tag` in `scripts/version.sh`
-  build_deps_image_version: 205530c16047066997bf2b210542ceeef8fb96d1
+  build_deps_image_version: 74aaa3a741443be2f5ee4d08e6b63898ec99f450
   build_deps_image_name: "${CI_REGISTRY}/tezos/opam-repository"
   GIT_STRATEGY: fetch
   GIT_DEPTH: "1"
diff --git a/manifest/main.ml b/manifest/main.ml
index 06d9e72637c67afd879f55812900973cd8f0485e..6b6b8c6e8ea3b0c57390a6083b0cb30f8552fe5b 100644
--- a/manifest/main.ml
+++ b/manifest/main.ml
@@ -99,7 +99,8 @@ let caqti_dynload = external_lib "caqti-dynload" V.True
 
 let cmdliner = external_lib "cmdliner" V.(at_least "1.1.0")
 
-let cohttp_lwt_unix = external_lib "cohttp-lwt-unix" V.(at_least "4.0.0")
+let cohttp_lwt_unix =
+  external_lib "cohttp-lwt-unix" V.(at_least "4.0.0" && different_from "5.1.0")
 
 let compiler_libs_common = external_lib "compiler-libs.common" V.True ~opam:""
 
@@ -3302,6 +3303,7 @@ let octez_rpc_http_server =
       [
         octez_base |> open_ ~m:"TzPervasives";
         octez_stdlib_unix |> open_;
+        cohttp_lwt_unix;
         resto_cohttp_server;
         resto_acl;
         octez_rpc;
diff --git a/opam/octez-smart-rollup-node.opam b/opam/octez-smart-rollup-node.opam
index 80114f0aa9e38c84487969664fb43e0443bebcbd..87ee9fe658b9c2f3c422b44342af37edab188963 100644
--- a/opam/octez-smart-rollup-node.opam
+++ b/opam/octez-smart-rollup-node.opam
@@ -13,7 +13,7 @@ depends: [
   "tezos-base"
   "tezos-stdlib-unix"
   "tezos-crypto"
-  "cohttp-lwt-unix" { >= "4.0.0" }
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
   "octez-node-config"
   "prometheus-app" { >= "1.2" }
   "octez-injector"
diff --git a/opam/tezos-rpc-http-client-unix.opam b/opam/tezos-rpc-http-client-unix.opam
index f4999936af6169ccba40f38cf3fdd51e7bcad2a7..e74420355ce1a9da635b461a3607bb1848c767b7 100644
--- a/opam/tezos-rpc-http-client-unix.opam
+++ b/opam/tezos-rpc-http-client-unix.opam
@@ -12,7 +12,7 @@ depends: [
   "ocaml" { >= "4.14" }
   "tezos-stdlib-unix"
   "tezos-base"
-  "cohttp-lwt-unix" { >= "4.0.0" }
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
   "resto-cohttp-client" { >= "1.0" }
   "tezos-rpc"
   "tezos-rpc-http-client"
diff --git a/opam/tezos-rpc-http-server.opam b/opam/tezos-rpc-http-server.opam
index 9a08bf0f2a28a4a53008bbfdfb38a772516e58db..6628a02636a7bee0fd72ba27ed2df7100d65e6ba 100644
--- a/opam/tezos-rpc-http-server.opam
+++ b/opam/tezos-rpc-http-server.opam
@@ -12,6 +12,7 @@ depends: [
   "ocaml" { >= "4.14" }
   "tezos-base"
   "tezos-stdlib-unix"
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
   "resto-cohttp-server" { >= "1.0" }
   "resto-acl" { >= "1.0" }
   "tezos-rpc"
diff --git a/opam/tezt-performance-regression.opam b/opam/tezt-performance-regression.opam
index 52afbb5ecb5def6621aa0fef10415fa6c260dcdf..f5ee8801f19bdf3166ff63584191ec5009788b80 100644
--- a/opam/tezt-performance-regression.opam
+++ b/opam/tezt-performance-regression.opam
@@ -12,7 +12,7 @@ depends: [
   "ocaml" { >= "4.14" }
   "tezt" { >= "3.1.0" }
   "uri" { >= "3.1.0" }
-  "cohttp-lwt-unix" { >= "4.0.0" }
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
 ]
 build: [
   ["rm" "-r" "vendors"]
diff --git a/opam/tezt-tezos.opam b/opam/tezt-tezos.opam
index ff74f320683e693f812f19eedf0722ae2028dbc6..4e8bfb322410eed70ee19d7781ca83c38d8e9c76 100644
--- a/opam/tezt-tezos.opam
+++ b/opam/tezt-tezos.opam
@@ -16,7 +16,7 @@ depends: [
   "hex" { >= "1.3.0" }
   "tezos-crypto-dal"
   "tezos-base"
-  "cohttp-lwt-unix" { >= "4.0.0" }
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
 ]
 build: [
   ["rm" "-r" "vendors"]
diff --git a/opam/virtual/octez-deps.opam b/opam/virtual/octez-deps.opam
index 600356c2c945afc90aadc3f2766c6a17a91a5f2a..d0da9bd728eb1468b469f2fe5dd472c9d007b4b5 100644
--- a/opam/virtual/octez-deps.opam
+++ b/opam/virtual/octez-deps.opam
@@ -24,7 +24,7 @@ depends: [
   "caqti-lwt"
   "class_group_vdf" { >= "0.0.4" }
   "cmdliner" { >= "1.1.0" }
-  "cohttp-lwt-unix" { >= "4.0.0" }
+  "cohttp-lwt-unix" { >= "4.0.0" & != "5.1.0" }
   "conf-libev"
   "conf-rust"
   "ctypes" { >= "0.18.0" }
diff --git a/scripts/version.sh b/scripts/version.sh
index effd441948c888f4a7e3a6a8c645576cd1c6d2d1..d03672981b6223fa6ea0fea1c4d6a1da5441f5d9 100755
--- a/scripts/version.sh
+++ b/scripts/version.sh
@@ -25,7 +25,7 @@ export full_opam_repository_tag=0e89b5b0195c6f2597c95251896e1ef8b199c1d2
 ## opam_repository is an additional, tezos-specific opam repository.
 ## This value MUST be the same as `build_deps_image_version` in `.gitlab-ci.yml`
 export opam_repository_url=https://gitlab.com/tezos/opam-repository
-export opam_repository_tag="${OPAM_REPOSITORY_TAG:-205530c16047066997bf2b210542ceeef8fb96d1}"
+export opam_repository_tag="${OPAM_REPOSITORY_TAG:-74aaa3a741443be2f5ee4d08e6b63898ec99f450}"
 export opam_repository_git="$opam_repository_url.git"
 export opam_repository="$opam_repository_git"\#"$opam_repository_tag"
 
diff --git a/src/lib_rpc_http/dune b/src/lib_rpc_http/dune
index e65dccf0409792b2a6ea0e2ea38da9e2711efd2e..1db6a874a13c2e7fe3c4c5c39d09d2efc89184a2 100644
--- a/src/lib_rpc_http/dune
+++ b/src/lib_rpc_http/dune
@@ -54,6 +54,7 @@
  (libraries
   tezos-base
   tezos-stdlib-unix
+  cohttp-lwt-unix
   resto-cohttp-server
   resto-acl
   tezos-rpc