diff --git a/lib/opam_build.ml b/lib/opam_build.ml
index fe4e02a8..eb69ef63 100644
--- a/lib/opam_build.ml
+++ b/lib/opam_build.ml
@@ -143,6 +143,34 @@ let install_project_deps ~opam_version ~opam_files ~selection =
     | `linux -> None
     | `freeBSD -> None
   in
+  let capnproto =
+    List.find_map
+      (fun pkg ->
+        match Astring.String.cut ~sep:"." pkg with
+        | Some (pkg, _) when pkg = "conf-capnproto" ->
+            Some
+              [
+                run ~network ~cache
+                  "sudo apt update && sudo apt install autoconf automake \
+                   libtool -y";
+                run ~network ~cache
+                  "git clone https://github.com/moyodiallo/capnproto.git && cd \
+                   capnproto && git reset --hard \
+                   37032615f1948327d7def94671a4335c251581b3";
+                run
+                  "cd capnproto/c++ && autoupdate && autoreconf -i && \
+                   ./configure && make -j6 && sudo make install";
+                run "rm -fr capnproto";
+              ]
+        | Some (_, _) | None -> None)
+      non_root_pkgs
+    |> Option.value ~default:[]
+    (* TODO: Will be removed when until a new version of debian in which capnproto has this fix
+     * "https://github.com/capnproto/capnproto/pull/1824" or similar.
+     *
+     * related to this bug "https://github.com/mirage/capnp-rpc/issues/273"
+     * *)
+  in
   (* XXX: don't overwrite default config? *)
   let opamrc = "" in
   let opam_version_str = Opam_version.to_string opam_version in
@@ -184,13 +212,10 @@ let install_project_deps ~opam_version ~opam_files ~selection =
         commit commit;
     ]
   @ pin_opam_files ~network ?work_dir groups
-  @ [
-      env "DEPS" non_root_pkgs;
-      env "CI" "true";
-      env "OCAMLCI" "true";
-      opam_depext;
-      run ~network ~cache "opam install $DEPS";
-    ]
+  @ [ env "DEPS" non_root_pkgs; env "CI" "true"; env "OCAMLCI" "true" ]
+  @ (if Variant.arch variant |> Ocaml_version.arch_is_32bit then capnproto
+     else [])
+  @ [ opam_depext; run ~network ~cache "opam install $DEPS" ]
 
 let spec ~base ~opam_version ~opam_files ~selection =
   let open Obuilder_spec in
diff --git a/service/conf.ml b/service/conf.ml
index aebada1e..b290cbbb 100644
--- a/service/conf.ml
+++ b/service/conf.ml
@@ -206,6 +206,7 @@ let platforms ~profile ~include_macos ~include_freebsd opam_version =
         List.rev OV.Releases.recent
       in
       List.map make_release [ latest; previous ]
+      @ [ make_release ~arch:`I386 OV.Releases.v4_14_1 ]
 
 (** When we have the same platform differing only in [lower_bound], for the
     purposes of Docker pulls, take only the platform with [lower_bound = true].